Variable gain amplifier

Details Variable gain amplifier Variable gain amplifier

2007-03-16

2008-12-09

Nguyen, Khanh V (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S311000

Reexamination Certificate

active

07463093

ABSTRACT:
A variable gain amplifier includes multiple gain stages. Each gain stage includes a gain transistor and a cascode transistor to form a cascode amplifier, and a current diversion transistor to divert current away from a cascode transistor to reduce gain in the stage. A control circuit is included to maintain substantially constant drain-to-source voltage and drain current in the gain transistor.

REFERENCES:
patent: 7199661 (2007-04-01), Shirvani-Mahdavi et al.
patent: 7321266 (2008-01-01), Chiang

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