Receiver architectures utilizing coarse analog tuning and associated methods
First Claim
1. A method for tuning a channel within a signal spectrum, comprising:
- receiving a signal spectrum including a plurality of channels within a frequency range;
receiving a selection signal identifying at least one desired channel be tuned;
selecting one of a plurality of coarse-tune analog mixing signals depending upon the location of the desired channel within the signal spectrum;
mixing the signal spectrum with the selected coarse-tune analog mixing signal to generate a coarsely tuned signal spectrum; and
digitally processing the coarsely tuned signal spectrum to fine tune the desired channel and to produce digital baseband signals for the desired channel.
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Abstract
Receiver architectures and associated methods are disclosed that provide initial analog coarse tuning of desired channels within a received signal spectrum, such as a set-top box signal spectrum for satellite communications. These 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.
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Citations
43 Claims
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1. A method for tuning a channel within a signal spectrum, comprising:
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receiving a signal spectrum including a plurality of channels within a frequency range;
receiving a selection signal identifying at least one desired channel be tuned;
selecting one of a plurality of coarse-tune analog mixing signals depending upon the location of the desired channel within the signal spectrum;
mixing the signal spectrum with the selected coarse-tune analog mixing signal to generate a coarsely tuned signal spectrum; and
digitally processing the coarsely tuned signal spectrum to fine tune the desired channel and to produce digital baseband signals for the desired channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for tuning a satellite signal spectrum including a plurality of transponder channels, comprising:
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receiving a satellite signal spectrum including a plurality of transponder channels within a frequency range, the transponder channels each including a plurality of program channels;
receiving a selection signal identifying at least one desired transponder channel to be tuned;
selecting one of a plurality of coarse-tune analog mixing signals depending upon the location of the desired transponder channel within the satellite signal spectrum;
mixing the satellite signal spectrum with the selected coarse-tune analog mixing signal to generate a coarsely tuned signal spectrum; and
digitally processing the coarsely tuned signal spectrum to fine tune the desired channel and to produce digital baseband signals for the desired transponder channel. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A receiver for tuning a channel within a signal spectrum, comprising:
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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. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A satellite set-top box for tuning a program channel within a satellite signal spectrum, comprising:
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a receiver configured to receive a satellite signal spectrum including a plurality of transponder channels and to tune a transponder channel within the signal spectrum, each transponder channel including a plurality of program channels, 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; and
a demodulator coupled to receive a digital baseband output signal from the receiver representative of a tuned transponder channel, the demodulator being configured to tune a program channel within the tuned transponder channel and to provide the tuned program channel as an output. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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Specification