Integrated multi-tuner satellite receiver architecture and associated method

• US 7,167,694 B2
• Filed: 04/14/2003
• Issued: 01/23/2007
• Est. Priority Date: 04/14/2003
• Status: Expired due to Fees

• Current Assignee: Silicon Laboratories Incorporated
• Original Assignee: Silicon Laboratories Incorporated
• Inventors: Krone, Andrew W., Khoini-Poorfard, Ramin
• Primary Examiner(s): Orgad; Edan
• Assistant Examiner(s): Chan; Richard
• Application Number:
  US10/412,871
• Publication Number:
  US 20040205819A1
• Time in Patent Office: 1,380 Days
• Field of Search: 455/132, 455/141, 455/182.3, 455/193.2, 455/193.3, 455/179
• US Class Current: 455/132
• CPC Class Codes: H03D 3/006 by sampling the oscillations and further processing the samples, e.g. by computing techniques H03D3/007 takes precedence
• CPC Class Codes: H03D 3/007 by converting the oscillations into two quadrature related signals H03D3/245 takes precedence
• CPC Class Codes: H03L 7/18 using a frequency divider or counter in the loop H03L7/20, H03L7/22 take precedence
• CPC Class Codes: H04H 40/90 specially adapted for satellite broadcast receiving
• CPC Class Codes: H04N 21/426 Internal components of the client ; Characteristics thereof H04N5/44 takes precedence
• CPC Class Codes: H04N 21/4263 involving specific tuning arrangements, e.g. two tuners
• CPC Class Codes: H04N 5/4446 IF amplifier circuits specially adapted for B&W TV RF amplifiers in general H03F3/189
• CPC Class Codes: H04N 5/50 Tuning indicators; Automatic tuning control
• CPC Class Codes: H04N 7/20 Adaptations for transmission via a GHz frequency band, e.g. via satellite

Abstract

Multi-tuner receiver architectures and associated methods are disclosed that provide initial analog coarse tuning of desired channels within a received signal spectrum, such as transponder channels within a set-top box signal spectrum for satellite communications. These multi-tuner satellite receiver architectures provide significant advantages over prior direct down-conversion (DDC) architectures and low intermediate-frequency (IF) architectures, particularly where two tuners are desired on the same integrated circuit. Rather than using a low-IF frequency or directly converting the desired channel frequency to DC, initial coarse tuning provided by analog coarse tuning circuitry allows for a conversion to a frequency range around DC. This coarse tuning circuitry can be implemented, for example, using a large-step local oscillator (LO) that provides a coarse tune analog mixing signal. Once mixed down, the desired channel may then be fine-tuned through digital processing, such as through the use of a wide-band analog-to-digital converter (ADC) or a narrow-band tunable bandpass ADC.

Claims

1. A method for tuning multiple channels with multi-tuner satellite receiver circuitry on a single integrated circuit, comprising:

providing at least two tuners on a single integrated circuit comprising first receiver circuitry and second receiver circuitry, the first and second receiver circuitry configured to operate at the same time;

with the first receiver circuitry,

receiving a first satellite signal spectrum including a plurality of transponder channels within a frequency range, each transponder channel including a plurality of program channels;

receiving a selection signal identifying a first transponder channel to be tuned;

mixing the first satellite signal spectrum with a first coarse-tune analog mixing signal to generate a first coarsely tuned signal spectrum; and

digitally processing the first coarsely tuned signal spectrum to fine tune the first desired transponder channel and to produce digital baseband signals representing the first desired transponder channel;

with the second receiver circuitry,

receiving a second satellite signal spectrum including a plurality of transponder channels within a frequency range, each transponder channel including a plurality of program channels;

receiving a selection signal identifying a second transponder channel to be tuned;

mixing the second satellite signal spectrum with a second coarse-tune analog mixing signal to generate a second coarsely tuned signal spectrum; and

digitally processing the second coarsely tuned signal spectrum to fine tune the second desired transponder channel and to produce digital baseband signals representing the second desired transponder channel; and

concurrently providing the digital baseband signals for the first desired transponder channel and the digital baseband signals for the second desired transponder channel as outputs from the first and second receiver circuitry,

wherein the digital processing step for the first and second receives each comprises using a wide-band analog-to-digital converter to convert the coarsely tuned signal spectrum to digital signals and using a tunable digital filter to tune the desired transponder channel.

2. The method of claim 1, further comprising for each of the first and second receiver circuitry, separating the frequency range of the satellite signal spectrum into a plurality of frequency bins and associating at least one coarse-tune analog mixing signal with each frequency bin.

3. The method of claim 2, further comprising for each of the first and second receiver circuitry, determining within which bin the desired channel falls and selecting the analog mixing signal associated with that bin.

4. The method of claim 3, wherein for each of the first and second receiver circuitry, the selecting step further comprises selecting a different analog mixing signal if the desired transponder channel overlaps the analog mixing signal associated with the bin within which the desired transponder channel falls.

8. The method of claim 2, further comprising configuring the frequency bins not to overlap.

9. The method of claim 2, further comprising configuring the frequency bins such that one or more of the frequency bins overlap in frequency ranges.

10. The method of claim 9, further comprising organizing the overlapping frequency bins as two sets of non-overlapping frequency bins, the first set overlapping the second set.

13. The method of claim 1, wherein the first and second satellite signal spectrums are the same.

14. The method of claim 1, further comprising demodulating the first tuned transponder channel to tune a first program channel within the first tuned transponder channel, and demodulating the second tuned transponder channel to tune a second program channel within the second tuned transponder channel.

15. The method of claim 14, further comprising utilizing the second tuned program channel to provide a data stream for personal video recorder operations.

16. The method of claim 14, further comprising utilizing the second tuned program channel to provide a data stream for picture-in-picture operations.

5. A method for tuning multiple channels with multi-tuner satellite receiver circuitry on a single integrated circuit, comprising:

providing at least two tuners on a single integrated circuit comprising first receiver circuitry and second receiver circuitry, the first and second receiver circuitry configured to operate at the same time;

with the first receiver circuitry,

receiving a first satellite signal spectrum including a plurality of transponder channels within a freciuency range, each transponder channel including a plurality of program channels;

receiving a selection signal identifying a first transponder channel to be tuned;

mixing the first satellite signal spectrum with a first coarse-tune analog mixing signal to generate a first coarsely tuned signal spectrum; and

digitally processing the first coarsely tuned signal spectrum to fine tune the first desired transponder channel and to produce digital baseband signals representing the first desired transponder channel;

with the second receiver circuitry.

receiving a second satellite signal spectrum including a plurality of transponder channels within a frequency range, each transponder channel including a plurality of program channels;

receiving a selection signal identifying a second transponder channel to be tuned;

mixing the second satellite signal spectrum with a second coarse-tune analog mixing signal to generate a second coarsely tuned signal spectrum; and

digitally processing the second coarsely tuned signal spectrum to fine tune the second desired transponder channel and to produce digital baseband signals representing the second desired transponder channel; and

concurrently providing the digital baseband signals for the first desired transponder channel and the digital baseband signals for the second desired transponder channel as outputs from the first and second receiver circuitry;

further comprising for each of the first and second receiver circuitry, separating the frequency range of the satellite signal spectrum into a plurality of frequency bins and associating at least one coarse-tune analog mixing signal with each frequency bin;

further comprising for each of the first and second receiver circuitry, determining within which bin the desired channel falls and selecting the analog mixing signal associated with that bin; and

further comprising sharing the first analog mixing signal if the first and second analog mixing signals will likely interfere with each other.

6. The method of claim 5, wherein the sharing step further comprises turning off a controlled oscillator within the second receiver circuitry while the first analog mixing signal is being shared.

7. The method of claim 5, further comprising sharing the output of the first receiver circuitry if the first and second analog mixing signals will likely interfere and turning off the second receiver circuitry while the output of the first receiver circuitry is being shared.

11. The method of claim 5, wherein the digital processing step for the first and second receives each comprises using a wide-band analog-to-digital converter to convert the coarsely tuned signal spectrum to digital signals and using a tunable digital filter to tune the desired transponder channel.

12. The method of claim 5, wherein the digital processing step for the first and second receivers each comprises using a narrow-band tunable bandpass analog-to-digital converter to tune the desired transponder channel and to convert the coarsely tuned signal spectrum to digital signals and using a tunable digital filter to further tune the desired transponder channel.

17. A method for tuning multiple channels with multi-tuner satellite receiver circuitry on a single integrated circuit, comprising:

providing at least two tuners on a single integrated circuit comprising first receiver circuitry and second receiver circuitry, the first and second receiver circuitry configured to operate at the same time;

with the first receiver circuitry,

receiving a first signal spectrum including a plurality of channels within a frequency range;

receiving a selection signal identifying a first channel to be tuned;

mixing the first satellite signal spectrum with a first coarse-tune analog mixing signal to generate a first coarsely tuned signal spectrum; and

digitally processing the first coarsely tuned signal spectrum to fine tune the first desired channel and to produce digital baseband signals representing the first desired channel;

with the second receiver circuitry,

receiving a second signal spectrum including a plurality of channels within a frequency range;

receiving a selection signal identifying a second channel to be tuned;

mixing the second signal spectrum with a second coarse-tune analog mixing signal to generate a second coarsely tuned signal spectrum; and

digitally processing the second coarsely tuned signal spectrum to fine tune the second desired channel and to produce digital baseband signals representing the second desired channel; and

concurrently providing the digital baseband signals for the first desired channel and the digital baseband signals for the second desired channel as outputs from the first and second receiver circuitry;

wherein the digital processing steps for the first and second receivers each comprises using a wide-band analog-to-digital converter to convert the coarsely tuned signal spectrum to digital signals and using a tunable digital filter to tune the desired transponder channel.

18. The method of claim 17, further comprising for each of the first and second receiver circuitry, separating the frequency range of the signal spectrum into a plurality of frequency bins and associating at least one coarse-tune analog mixing signal with each frequency bin.

19. The method of claim 18, further comprising for each of the first and second receiver circuitry, determining within which bin the desired channel falls and selecting the analog mixing signal associated with that bin.

20. The method of claim 19, wherein for each of the first and second receiver circuitry, the selecting step further comprises selecting a different analog mixing signal if the desired channel overlaps the analog mixing signal associated with the bin within which the desired channel falls.

22. The method of claim 18, further comprising configuring the frequency bins not to overlap.

23. The method of claim 18, further comprising configuring the frequency bins such that one or more of the frequency bins overlap in frequency ranges.

24. The method of claim 23, further comprising organizing the overlapping frequency bins as two sets of non-overlapping frequency bins, the first set overlapping the second set.

27. The method of claim 17, wherein the first and second signal spectrums are the same.

28. The method of claim 17, wherein the first and second signal spectrums comprise satellite channel signal spectrums.

21. A method for tuning multiple channels with multi-tuner satellite receiver circuitry on a single integrated circuit, comprising:

providing at least two tuners on a single integrated circuit comprising first receiver circuitry and second receiver circuitry, the first and second receiver circuitry configured to operate at the same time;

with the first receiver circuitry,

receiving a first signal spectrum including a plurality of channels within a freciuency range;

receiving a selection signal identifying a first channel to be tuned;

mixing the first satellite signal spectrum with a first coarse-tune analog mixing signal to generate a first coarsely tuned signal spectrum; and

digitally processing the first coarsely tuned signal spectrum to fine tune the first desired channel and to produce digital baseband signals representing the first desired channel;

with the second receiver circuitry,

receiving a second signal spectrum including a plurality of channels within a freciuency range;

receiving a selection signal identifying a second channel to be tuned;

mixing the second signal spectrum with a second coarse-tune analog mixing signal to generate a second coarsely tuned signal spectrum; and

digitally processing the second coarsely tuned signal spectrum to fine tune the second desired channel and to produce digital baseband signals representing the second desired channel; and

concurrently providing the digital baseband signals for the first desired channel and the digital baseband signals for the second desired channel as outputs from the first and second receiver circuitry;

further comprising for each of the first and second receiver circuitry, separating the frequency range of the signal spectrum into a plurality of freciuency bins and associating at least one coarse-tune analog mixing signal with each frequency bin;

further comprising for each of the first and second receiver circuitry, determining within which bin the desired channel falls and selecting the analog mixing signal associated with that bin; and

further comprising sharing the first analog mixing signal if the first and second analog mixing signals will likely interfere with each other.

25. The method of claim 21, wherein the digital processing steps for the first and second receivers each comprises using a wide-band analog-to-digital converter to convert the coarsely tuned signal spectrum to digital signals and using a tunable digital filter to tune the desired transponder channel.

26. The method of claim 21, wherein the digital processing step for the first and second receivers each comprises using a narrow-band tunable bandpass analog-to-digital converter to tune the desired transponder channel and to convert the coarsely tuned signal spectrum to digital signals and using a tunable digital filter to further tune the desired transponder channel.

29. A multi-tuner satellite receiver system for tuning multiple channels with multi-tuner satellite receiver circuitry on a single integrated circuit, comprising:

first receiver circuitry within an integrated circuit, comprising;

first local oscillator (LO) circuitry having a first channel selection signal as an input and having a first coarse-tune analog mixing signal as an output, the first output mixing signal being selected from a plurality of predetermined output mixing signals depending upon a first desired transponder channel to be tuned;

first analog coarse tune circuitry having the first coarse-tune analog mixing signal as an input and having a first satellite signal spectrum as an input, the first satellite signal spectrum including a plurality of transponder channels within a frequency range, and the first analog coarse tune circuitry being configured to use the first coarse-tune analog mixing signal to output a first coarsely tuned signal spectrum; and

first digital fine tune circuitry having the first coarsely tuned signal spectrum as an input and having as an output digital baseband signals for the first desired transponder channel; and

second receiver circuitry within the same integrated circuit, comprising;

second local oscillator (LO) circuitry having a second channel selection signal as an input and having a second coarse-tune analog mixing signal as an output, the second output mixing signal being selected from a plurality of predetermined output mixing signals depending upon a second desired transponder channel to be tuned;

second analog coarse tune circuitry having the second coarse-tune analog mixing signal as an input and having a second satellite signal spectrum as an input, the second satellite signal spectrum including a plurality of transponder channels within a frequency range, and the second analog coarse tune circuitry being configured to use the second coarse-tune analog mixing signal to output a second coarsely tuned signal spectrum; and

second digital fine tune circuitry having the second coarsely tuned signal spectrum as an input and having as an output digital baseband signals for the second desired transponder channel;

wherein the first and second digital fine tune circuitry each comprises a wide-band analog-to-digital converter having the coarsely tuned signal spectrum as an input and having digital signals as an output, and also comprises a tunable digital filter configured to tune the desired transponder channel.

30. The multi-tuner satellite receiver system of claim 29, wherein for each of the first and second receiver circuitry, the frequency range of the satellite signal spectrum is organized into a plurality of frequency bins and at least one coarse-tune analog mixing signal is associated with each frequency bin.

31. The multi-tuner satellite receiver system of claim 30, wherein for each of the first and second receiver circuitry, the analog mixing signal selected for output by the LO circuitry is an analog mixing signal associated with the bin within which the desired transponder channel falls.

32. The multi-tuner satellite receiver system of claim 31, wherein for each of the first and second receiver circuitry, a different analog mixing signal is selected if the desired transponder channel overlaps the analog mixing signal associated with the bin within which the desired transponder channel falls.

34. The multi-tuner satellite receiver system of claim 30, wherein the frequency bins are configured not to overlap.

35. The multi-tuner satellite receiver system of claim 30, wherein the frequency bins are configured such that one or more of the frequency bins overlap in frequency ranges.

38. The multi-tuner satellite receiver system of claim 29, wherein the first and second satellite signal spectrums are the same.

39. The multi-tuner satellite receiver system of claim 29, wherein the first and second LO circuitry each comprises phase-lock-loop (PLL) circuitry including a phase detector and a controlled oscillator, the phase detector receiving a first signal representative of a reference frequency, receiving a second signal representative of an output frequency of the controlled oscillator, and generating at least one control signal to adjust the output frequency of the controlled oscillator.

40. The multi-tuner satellite receiver system of claim 39, wherein the first and second LO circuitry each further comprises control circuitry configured to receive a channel selection signal and to control divider circuitry that provides the first and second signals to the phase detector based upon divided versions of the reference frequency and the output of the controlled oscillator, the control circuitry acting to select the coarse-tune analog mixing signal output by the PLL circuitry.

41. The multi-tuner satellite receiver system of claim 39, wherein the controlled oscillators for the first and second LO circuitry utilize RC-based resonant structures.

42. The dual satellite receiver system of claim 29, further comprising a first demodulator coupled to receive a digital baseband output signal from the first receiver representative of a first tuned transponder channel, the first demodulator being configured to tune a first program channel within the first tuned transponder channel and to provide the first tuned program channel as an output, and further comprising a second demodulator coupled to receive a digital baseband output signal from the second receiver representative of a second tuned transponder channel, the second demodulator being configured to tune a second program channel within the second tuned transponder channel and to provide the second tuned program channel as an output.

43. The multi-tuner satellite receiver system of claim 42, wherein the second tuned program channel is utilized to provide a data stream for personal video recorder operations.

44. The multi-tuner satellite receiver system of claim 42, wherein the second tuned program channel is utilized to provide a data stream for picture-in-picture operations.

33. A multi-tuner satellite receiver system for tuning multiple channels with multi-tuner satellite receiver circuitry on a single integrated circuit, comprising:

first receiver circuitry within an integrated circuit, comprising;

first local oscillator (LO) circuitry having a first channel selection signal as an input and having a first coarse-tune analog mixing signal as an output, the first output mixing signal being selected from a plurality of predetermined output mixing signals depending upon a first desired transponder channel to be tuned;

first analog coarse tune circuitry having the first coarse-tune analog mixing signal as an input and having a first satellite signal spectrum as an input, the first satellite signal spectrum including a plurality of transponder channels within a frequency range, and the first analog coarse tune circuitry being configured to use the first coarse-tune analog mixing signal to output a first coarsely tuned signal spectrum; and

first digital fine tune circuitry having the first coarsely tuned signal spectrum as an input and having as an output digital baseband signals for the first desired transponder channel; and

second receiver circuitry within the same integrated circuit, comprising;

second local oscillator (LO) circuitry having a second channel selection signal as an input and having a second coarse-tune analog mixing signal as an output, the second output mixing signal being selected from a plurality of predetermined output mixing signals depending upon a second desired transponder channel to be tuned;

second analog coarse tune circuitry having the second coarse-tune analog mixing signal as an input and having a second satellite signal spectrum as an input, the second satellite signal spectrum including a plurality of transponder channels within a frequency range, and the second analog coarse tune circuitry being configured to use the second coarse-tune analog mixing signal to output a second coarsely tuned signal spectrum; and

second digital fine tune circuitry having the second coarsely tuned signal spectrum as an input and having as an output digital baseband signals for the second desired transponder channel;

wherein for each of the first and second receiver circuitry, the frequency range of the satellite signal spectrum is organized into a plurality of frequency bins and at least one coarse-tune analog mixing signal is associated with each frequency bin;

wherein for each of the first and second receiver circuitry, the analog mixing signal selected for output by the LO circuitry is an analog mixing signal associated with the bin within which the desired transponder channel falls; and

wherein the first analog mixing signal is shared by the second receiver circuitry if the first and second analog mixing signals will likely interfere with each other.

36. The multi-tuner satellite receiver system of claim 33, wherein the first and second digital fine tune circuitry each comprises a wide-band analog-to-digital converter having the coarsely tuned signal spectrum as an input and having digital signals as an output, and also comprises a tunable digital filter configured to tune the desired transponder channel.

37. The multi-tuner satellite receiver system of claim 33, wherein the first and second digital fine tune circuitry each comprises a narrow-band tunable bandpass analog-to-digital converter configured to tune the desired transponder channel and to convert the coarsely tuned signal spectrum to digital signals, and also comprises a tunable digital filter to further tune the desired transponder channel.

45. A multi-tuner receiver system for tuning multiple channels with multi-tuner receiver circuitry on a single integrated circuit, comprising:

first receiver circuitry within an integrated circuit, comprising;

first local oscillator (LO) circuitry having a first channel selection signal as an input and having a first coarse-tune analog mixing signal as an output, the first output mixing signal being selected from a plurality of predetermined output mixing signals depending upon a first desired channel to be tuned;

first analog coarse tune circuitry having the first coarse-tune analog mixing signal as an input and having a first signal spectrum as an input, the first signal spectrum including a plurality of channels within a frequency range, and the first analog coarse tune circuitry being configured to use the first coarse-tune analog mixing signal to output a first coarsely tuned signal spectrum; and

first digital fine tune circuitry having the first coarsely tuned signal spectrum as an input and having as an output digital baseband signals for the first desired channel; and

second receiver circuitry within the same integrated circuit, comprising;

second local oscillator (LO) circuitry having a second channel selection signal as an input and having a second coarse-tune analog mixing signal as an output, the second output mixing signal being selected from a plurality of predetermined output mixing signals depending upon a second desired channel to be tuned;

second analog coarse tune circuitry having the second coarse-tune analog mixing signal as an input and having a second signal spectrum as an input, the second signal spectrum including a plurality of channels within a frequency range, and the second analog coarse tune circuitry being configured to use the second coarse-tune analog mixing signal to output a second coarsely tuned signal spectrum; and

second digital fine tune circuitry having the second coarsely tuned signal spectrum as an input and having as an output digital baseband signals for the second desired channel;

wherein the first and second digital fine tune circuitry each comprises a wide-band analog-to-digital converter having the coarsely tuned signal spectrum as an input and having digital signals as an output, and also comprises a tunable digital filter configured to tune the desired channel.

46. The multi-tuner receiver of claim 45, wherein for each of the first and second receiver circuitry, the frequency range of the signal spectrum is organized into a plurality of frequency bins and at least one coarse-tune analog mixing signal is associated with each frequency bin.

47. The multi-tuner receiver of claim 46, wherein for each of the first and second receiver circuitry, the analog mixing signal selected for output by the LO circuitry is an analog mixing signal associated with the bin within which the desired channel falls.

48. The multi-tuner receiver of claim 47, wherein for each of the first and second receiver circuitry, a different analog mixing signal is selected if the desired channel overlaps the analog mixing signal associated with the bin within which the desired channel falls.

52. The multi-tuner receiver of claim 45, further comprising third receiver circuitry and fourth receiver circuitry within the integrated circuit, each of the third and fourth receiver circuitry, comprising:

local oscillator (LO) circuitry having a channel selection signal as an input and having a coarse-tune analog mixing signal as an output, the output mixing signal being selected from a plurality of predetermined output mixing signals depending upon a desired channel to be tuned;

analog coarse tune circuitry having the coarse-tune analog mixing signal as an input and having a signal spectrum as an input, the signal spectrum including a plurality of channels within a frequency range, and the analog coarse tune circuitry being configured to use the coarse-tune analog mixing signal to output a coarsely tuned signal spectrum; and

digital fine tune circuitry having the coarsely tuned signal spectrum as an input and having as an output digital baseband signals for the desired channel.

49. A multi-tuner receiver system for tuning multiple channels with multi-tuner receiver circuitry on a single integrated circuit, comprising:

first receiver circuitry within an integrated circuit, comprising;

first local oscillator (LO) circuitry having a first channel selection signal as an input and having a first coarse-tune analog mixing signal as an output, the first output mixing signal being selected from a plurality of predetermined output mixing signals depending upon a first desired channel to be tuned;

first analog coarse tune circuitry having the first coarse-tune analog mixing signal as an input and having a first signal spectrum as an input, the first signal spectrum including a plurality of channels within a freciuency range, and the first analog coarse tune circuitry being configured to use the first coarse-tune analog mixing signal to output a first coarsely tuned signal spectrum; and

first digital fine tune circuitry having the first coarsely tuned signal spectrum as an input and having as an output digital baseband signals for the first desired channel; and

second receiver circuitry within the same integrated circuit, comprising;

second local oscillator (LO) circuitry having a second channel selection signal as an input and having a second coarse-tune analog mixing signal as an output, the second output mixing signal being selected from a plurality of predetermined output mixing signals depending upon a second desired channel to be tuned;

second analog coarse tune circuitry having the second coarse-tune analog mixing signal as an input and having a second signal spectrum as an input, the second signal spectrum including a plurality of channels within a freciuency range, and the second analog coarse tune circuitry being configured to use the second coarse-tune analog mixing signal to output a second coarsely tuned signal spectrum; and

second digital fine tune circuitry having the second coarsely tuned signal spectrum as an input and having as an output digital baseband signals for the second desired channel;

wherein for each of the first and second receiver circuitry, the freciuency range of the signal spectrum is organized into a plurality of freciuency bins and at least one coarse-tune analog mixing signal is associated with each freciuency bin;

wherein for each of the first and second receiver circuitry, the analog mixing signal selected for output by the LO circuitry is an analog mixing signal associated with the bin within which the desired channel falls; and

wherein the first analog mixing signal is shared by the second receiver circuitry if the first and second analog mixing signals will likely interfere with each other.

50. The multi-tuner receiver of claim 49, wherein the first and second digital fine tune circuitry each comprises a wide-band analog-to-digital converter having the coarsely tuned signal spectrum as an input and having digital signals as an output, and also comprises a tunable digital filter configured to tune the desired channel.

51. The multi-tuner receiver of claim 49, wherein the first and second digital fine tune circuitry each comprises a narrow-band tunable bandpass analog-to-digital converter configured to tune the desired channel and to convert the coarsely tuned signal spectrum to digital signals, and also comprises a tunable digital filter to further tune the desired channel.