Microtune (texas), Inc.

Csr Technology Inc.

Microtune, Inc.

Kenneth W Clayton

Robert Rudolf Rotzoll

Albert H Taddiken

S Vincent Birleson

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.

Broadband integrated tuner

A broadband integrated television receiver for receiving a standard antenna or cable input and outputting an analog composite video signal and composite audio signal is disclosed. The receiver employs an up-conversion mixer and a down-conversion mixer in series to produce an IF signal. An IF filter between the mixers performs coarse channel selection. The down-conversion mixer may be an image rejection mixer to provide additional filtering. The received RF television signals are converted to a standard 45.75 MHz IF signal for processing on-chip by additional circuitry.

Broadband integrated television tuner

Highly integrated television tuner on a single microcircuit

The system and method for switching a radio frequency (RF) signal between mixers can provide a large automatic gain control (AGC) range while maintaining low noise levels by using a switching circuit to select between at least two mixers that are switched between a common load using reverse biasing. To turn off a specific mixer, RF inputs to that mixer are reverse biased, which shuts off the current to the load. The full AGC of the switching circuit is approximately the sum of the AGC of each mixer. Each mixer has a limited AGC range, which limits the amount of current swing needed for the full AGC of the switching circuit. By dividing the switching circuit between two or more mixers, the transistor devices in each mixer may be sized appropriately with respect to the current levels being used in each mixer. For instance, in a mixer designed specifically for low noise applications, the transistor devices can be very large. For a mixer that is designed to tolerate more noise, the transistor devices may be smaller, which allows more precise tailoring of the ft of the particular mixer. These two mixers may be coupled together in the system and method of switching an RF signal between mixers to obtain the individual benefits of each mixer.

Growing community of inventors

Plano, TX, United States of America

Kenneth W Clayton