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US 2006/0221256 A1Published application
Broadband integrated tuner
AssigneeMicrotune (Texas), L.P.
InventorsS. Birleson, Robert Rotzoll, Albert Taddiken, Kenneth Clayton
Life of this patent
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Abstract
A broadband integrated receiver for receiving input signals and outputting composite video and audio signals is disclosed. The receiver employs an up-conversion mixer and a down-conversion mixer in series to produce an intermediate signal. An intermediate filter between the mixers performs coarse channel selection. The down-conversion mixer may be an image rejection mixer to provide additional filtering.
Claims76
-71. (canceled)
A Radio Frequency (RF) tuner comprising:
- an RF 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 RF input and a second input coupled to said first reference signal;
- a first passive bandpass filter coupled to an output of said first mixer;
- the bandpass filter passing more than one channel and performing partial image rejection, wherein the more than one channel passed by the bandpass filter is attenuated, and wherein said partial image rejection decreases a total signal power of an output of said filter;
- a second reference signal having a variable 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.
5 more elements
A method of processing a received RF signal using a television tuner, the method comprising the steps of:
- 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 more than one channel;
- and
- mixing the output passband signal with a second reference signal having a variable operating frequency to thereby produce a second IF signal.
3 more elements
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 first passive 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, wherein the more than one channel passed by the bandpass filter is attenuated;
- a first and a second phase locked loop providing reference inputs for a third phase locked loop;
- a second reference signal produced by said third phase locked loop 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 third phase locked loop to receive said second reference signal.
6 more elements
A Radio Frequency (RF) tuner comprising:
- an RF 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 RF input and a second input coupled to said first reference signal;
- a first passive bandpass filter coupled to an output of said first mixer;
- the bandpass filter passing more than one channel and performing partial image rejection, wherein the more than one channel passed by the bandpass filter is attenuated, and wherein said partial image rejection decreases a total signal power of an output of said filter;
- 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.
5 more elements
A method of processing a received RF signal, the method comprising the steps of:
- mixing the RF signal with a first reference signal having a first operating frequency to thereby produce a first IF signal;
- controlling a frequency of said first operating frequency for said mixing the RF signal using a digital interface;
- filtering the first IF signal in a bandpass filter to produce an output passband signal having a plurality of channels;
- and
- mixing the output passband signal with a second reference signal having a second operating frequency to thereby produce a second IF signal, wherein said mixing the RF signal and said mixing the output passband signal are performed in a single integrated circuit.
2 more elements
A method of processing a received RF signal using a television tuner, the method comprising the steps of:
- 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;
- mixing the amplified first filtered signal with a first reference signal having a first operating frequency to thereby produce a first IF signal, said mixing including filtering a frequency sum signal component created by a combination of said amplified first signal and said first reference signal;
- filtering the first IF signal in a bandpass filter to produce an output passband signal having a plurality of channels;
- and
- mixing the output passband signal with a second reference signal having a second operating frequency to thereby produce a second IF signal.
3 more elements
A television receiver comprising:
- 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 digital interface providing control with respect to said first mixer;
- wherein said digital interface comprises an inter-integrated circuit interface;
- 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, wherein said first mixer and said second mixer are physically located in the same integrated circuit substrate.
6 more elements
The television receiver of claim 135 wherein said digital interface comprises an inter-integrated circuit bus.
A television receiver comprising:
- 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 integrated circuit 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.
2 more elements
A method of processing a received RF signal, the method comprising the steps of:
- mixing the RF signal with a first reference signal having a first operating frequency to thereby produce a first IF signal;
- controlling a frequency of said first operating frequency for said mixing the RF signal using a digital interface;
- 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, wherein said mixing the RF signal and said mixing the output passband signal are performed in a single integrated circuit.
2 more elements
A method of processing a received RF signal using a television tuner, the method comprising the steps of:
- 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.
3 more elements
Dependencies are inferred from the claim text.