Raytheon Company

Hieu M Le

Lloyd Frederick Linder

Erick M Hirata

Don C Devendorf

Benjamin Felder

Kelvin T Tran

Roger N Kosaka

Donald G McMullin

A current steering circuit diverts bias current from a differential current summing amplifier's front end when the differential input exceeds a safe threshold level, thus preventing the amplifier's output stage from being overdriven. Diverting the front end's bias currents also turns off transistors within the amplifier's front end and thus protects the front end from damage which may otherwise result from excessive input signals.

Current feedback differential amplifier clamp

An amplifier includes an amplifying circuit and bias current circuit. The bias current circuit includes a beta matching circuit which employs a temperature compensated current reference to develop a bias current for the amplifying circuit. The beta matching circuit is connected to track the current gains of transistors within the amplifying circuit and to thereby provide a temperature compensated bias current to the amplifying circuit. The bias current maintains a fixed bias point regardless of temperature-induced, or other, variations of the current gains of the amplifying circuit's transistors.

Temperature compensated amplifier

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Midway City, CA, United States of America

Hieu M Le