Quad switched gain circuit

A switched gain circuit (350) that employs a plurality of conduction paths (378-384) that provide different levels of signal gain or attenuation to an analog input signal. Each conduction path (378-384) includes a plurality of switching devices (388-402 and 410-424), such as heterojunction bipolar t...

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Bibliographic Details
Main Author HARBERTS, HARRY S
Format Patent
LanguageEnglish
French
German
Published 08.10.2003
Edition7
Subjects
AMPLIFIERS
BASIC ELECTRONIC CIRCUITRY
CODE CONVERSION IN GENERAL
CODING
CONTROL OF AMPLIFICATION
DECODING
ELECTRICITY
IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS
RESONATORS
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Summary:A switched gain circuit (350) that employs a plurality of conduction paths (378-384) that provide different levels of signal gain or attenuation to an analog input signal. Each conduction path (378-384) includes a plurality of switching devices (388-402 and 410-424), such as heterojunction bipolar transistors. Further, each conduction path includes a gain device such as a degenerative resistor, that provides gain or attenuation to the analog input signals. A separate control signal is applied to a switching device (410-424) in each conduction path (378-384) to select a particular conduction path to be coupled to the output. The analog input signal can be a differential analog input signal where a first part of the signal is coupled to the base terminal of a bipolar transistor (410-424) in each conduction path (378-384), and a second part of the analog signal is coupled to the base terminal of another bipolar transistor (410-424) in each conduction path (378-384).
Bibliography:Application Number: EP20030007345