Highly integrated television tuner on a single microcircuit
DCFirst Claim
Patent Images
1. A television receiver comprising:
- a receiver input coupled to an RF signal source;
a first reference signal having a first operating frequency;
a first mixer having a first input coupled to said receiver input and a second input coupled to said first reference signal;
a second reference signal having a second operating frequency; and
a second mixer having a first input coupled directly to an output of said first mixer and a second input coupled to said second reference signal, wherein said second mixer is an image rejection mixer.
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Abstract
There is disclosed a fully integrated television receiver for receiving a standard antenna or cable input and outputting a standard video baseband signal and a standard audio baseband signal. The receiver employs an up-conversion mixer and a down-conversion image-rejection mixer in series to produce an on-chip IF signal. Audio detection of the IF signal is performed via an audio delay-locked loop operating in quadrature to the audio FM signal. Video detection of the IF signal is performed by frequency mixing the IF signal with the extracted video carrier of the IF signal. Variable load drive capability is provided for both the video output and the audio output.
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Citations
128 Claims
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1. A television receiver comprising:
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a receiver input coupled to an RF signal source; a first reference signal having a first operating frequency; a first mixer having a first input coupled to said receiver input and a second input coupled to said first reference signal; a second reference signal having a second operating frequency; and a second mixer having a first input coupled directly to an output of said first mixer and a second input coupled to said second reference signal, wherein said second mixer is an image rejection mixer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A television receiver comprising:
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a receiver input coupled to an RF signal source; a first mixer physically located on an integrated circuit substrate having a first input coupled to said receiver input and a second input coupled to a first reference signal having a first operating frequency, wherein said first operating frequency is variable between a minimum frequency value and a maximum frequency value; and a second mixer physically located on the same integrated circuit substrate as the first mixer and having a first input directly coupled without leaving the substrate to an output of said first mixer and a second input coupled to a second reference signal having a second operating frequency, wherein said second operating frequency is fixed. - View Dependent Claims (24, 25, 26, 27)
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28. A method of processing a received RF signal, the method comprising the steps of:
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mixing the RF signal with a first reference signal having a first operating frequency to thereby produce a first IF signal; and mixing the first IF signal with a second reference signal having a second operating frequency to thereby produce a second IF signal, said mixing of the first IF signal with the second reference signal occurring prior to eliminating any channels from the first IF signal, wherein said RF signal mixing and said first IF signal mixing operations are accomplished on the same integrated circuit substrate. - View Dependent Claims (29, 30, 31, 32, 33)
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34. A method of processing a received RF signal, the method comprising the steps of:
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filtering all frequency components above an input cutoff frequency out of the received RF signal to thereby produce a first filtered signal; amplifying the first filtered signal; subtractively mixing the amplified first filtered signal with a first reference signal having a first operating frequency to thereby produce a first IF signal; and mixing the first IF signal with a second reference signal having a second operating frequency to thereby produce a second IF signal, said mixing of the first IF signal with the second reference signal occurring prior to eliminating any channels from the first IF signal. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41)
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42. A television receiver comprising:
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an input filter coupled to an RF signal source; a first amplifier coupled to an output of said input filter; a first mixer having a first input and a second input, wherein said first input of said first mixer is coupled to an output of said first amplifier; a first oscillator coupled to said second input of said first mixer, wherein said first oscillator generates a first reference signal having a first operating frequency; a second mixer having a first input and a second input, wherein said first input of said second mixer is coupled directly to an output of said first mixer without the connection of a filter therebetween; a second oscillator coupled to said second input of said second mixer, wherein said second oscillator generates a second reference signal having a second operating frequency; and a second filter coupled to an output of said second mixer. - View Dependent Claims (43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 119)
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83. A television receiver comprising:
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a receiver input coupled to an RF signal source; a first reference signal having a first operating frequency; a first mixer having a first input coupled to said receiver input and a second input coupled to said first reference signal; a first bandpass filter coupled to an output of said first mixer;
the bandpass filter passing more than one channel and performing partial image rejection as well as limiting overall signal power levels to be processed by subsequent circuitry;a second reference signal having a second operating frequency; and an image rejection mixer having a first input coupled to an output of said first bandpass filter and a second input coupled to said second reference signal. - View Dependent Claims (84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96)
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97. A television receiver comprising:
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a receiver input coupled to an RF signal source; a first mixer having a first input coupled to said receiver input and a second input coupled to a first reference signal having a first operating frequency, wherein said first operating frequency is variable between a minimum frequency value and a maximum frequency value; a first bandpass filter constructed in the same substrate as said first mixer and coupled to an output of said first mixer; and a second mixer having a first input coupled to an output of said first bandpass filter and a second input coupled to a second reference signal having a second operating frequency, wherein said second operating frequency is fixed. - View Dependent Claims (98, 99, 100, 101)
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102. A method of processing a received RF signal, the method comprising the steps of:
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mixing the RF signal with a first reference signal having a first operating frequency to thereby produce a first IF signal; filtering the first IF signal in a first bandpass filter to produce an output passband signal having at least four channels; and mixing the output passband signal with a second reference signal having a second operating frequency to thereby produce a second IF signal. - View Dependent Claims (103, 104, 105, 106, 107)
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108. A method of processing a received RF signal, the method comprising the steps of:
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filtering all frequency components above an input cutoff frequency out of the received RF signal to thereby produce a first filtered signal; amplifying the first filtered signal; subtractively mixing the amplified first filtered signal with a first reference signal having a first operating frequency to thereby produce a first IF signal; filtering the first IF signal in a bandpass filter to produce an output passband signal having at least four channels; and mixing the output passband signal with a second reference signal having a second operating frequency to thereby produce a second IF signal. - View Dependent Claims (109, 110, 111, 112, 113, 114, 115)
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116. The method of extracting a single communications channel from a large number of such channels wherein each such channel has a defined frequency range, and wherein the large number of channels are communicated within an upper and a lower frequency boundary, the method comprising the steps of:
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from an input signal containing all of the large number of channels removing all frequencies greater than the upper frequency boundary; translating all of the channels contained within the input signal to a translated frequency range such that a desired single channel to be extracted from the input signal is positioned centrally within the translated frequency range, the translated frequency range being positioned at frequencies higher than the upper frequency boundary; removing from the translated input signal all channels extending from the center of the translated frequency range four channels or more in each frequency direction; translating the remaining channels within the input signal to a second translated frequency range, such that the desired single channel to be extracted from the input signal is positioned centrally within the second translated frequency range having a low end frequency boundary defined as high enough not to cause phase distortion in any subsequent filtering and a high end frequency boundary defined as a frequency beyond which a filter with proper bandwidth, noise and distortion can be integrated in a substrate; and removal of all remaining frequencies which are not part of the desired single channel. - View Dependent Claims (117, 118)
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120. A television receiver comprising:
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a receiver input for receiving an RF signal; an input filter coupled to said receiver input and operating to remove all frequency components in said RF signal above an input cutoff frequency to produce a filtered RF signal; a first reference signal having a first operating frequency; a first mixer having a first input coupled to an output of said input filter and a second input coupled to said first reference signal; a second reference signal having a second operating frequency; and a second mixer having a first input coupled to an output of said first mixer and a second input coupled to said second reference signal, wherein said second mixer is an image rejection mixer. - View Dependent Claims (121, 122, 123, 124, 125, 126, 127, 128)
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Specification