# US 7,746,412 B2 · Highly integrated television tuner on a single microcircuit

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- Number: US 7,746,412 B2
- Document ID: US7746412B2
- Status: Granted
- Kind: B2
- Application number: 12/271,607
- Filed: 2008-11-14
- Published: 2009-03-12
- Granted: 2010-06-29
- Earliest claimed: 1995-04-21
- Assignees: Microtune (Texas), L.P.
- Inventors: S. Vincent Birleson; Robert Rudolf Rotzoll; Albert H. Taddiken; Kenneth W. Clayton
- Web page: https://patentgrep.com/patent/US7746412B2

## CPC

- H03J 1/005: {in a loop}
- H03D 7/161: {all the frequency changers being connected in cascade}
- H03J 7/065: {the counter or frequency divider being used in a phase locked loop}
- H04N 5/4446: {IF amplifier circuits specially adapted for B&W TV (RF amplifiers in general H03F3/189)}
- H04N 5/455: Demodulation-circuits
- H04N 5/50: Tuning indicators; Automatic tuning control
- H04N 5/52: Automatic gain control
- H04N 5/60: for the sound signals
- H04N 21/4263: {involving specific tuning arrangements, e.g. two tuners}
- H03J 2200/14: Tunable filter in receiver contributing to image rejection
- H04N 21/426: Internal components of the client {; Characteristics thereof} (H04N5/44 takes precedence)
- H03J: TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03D: DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER (masers, lasers H01S; circuits capable of acting both as modulator and demodulator H03C; details applicable to both modulators and frequency-changers H03C; demodulating pulses H03K9/00; transforming types of pulse modulation H03K11/00; coding, decoding or code conversion, in general H03M; repeater stations H04B7/14; demodulators adapted for AC systems of digital information transmission H04L27/00; synchronous demodulators adapted for colour television H04N9/66)
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## 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.

## Claims

### Claim 1

A television receiver comprising:
a receiver input for receiving an RF signal;
a first mixer having a first input coupled to said receiver and a second input coupled to a first local oscillator, said first local oscillator is controlled digitally to generate a first reference signal; and
a second mixer having a first input coupled to an output of said first mixer and a second input coupled to a second local oscillator, said second local oscillator generating a second reference signal, wherein said second mixer comprises:
a phase splitter having an input coupled to said second local oscillator;
a first and a second multiplier, wherein each multiplier has a first input coupled to an output of said phase splitter and a second input coupled to the output of said first mixer; and
a summer to combine the output of each multiplier.