High dynamic range variable gain amplifier

Details High dynamic range variable gain amplifier High dynamic range variable gain amplifier

1997-01-27

1999-03-09

Mullins, James B.

Amplifiers

Combined with automatic amplifier disabling switch means

330254, 330283, H23G 330

Patent

active

058806318

ABSTRACT:
A multi-stage low power, high dynamic range variable gain amplifier comprises an input stage cascaded with one or more current amplifier stages, whereby the gain of each stage may be independently controlled. The input stage may be comprised of a variable transconductance amplifier using variable emitter degeneration. The current amplifier may be comprised of a differential Darlington amplifier coupled to a differential cascode amplifier. The transconductance amplifier converts an input voltage signal to a current signal. The variable gain amplifier is designed for efficient low power operation.

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patent: 5418494 (1995-05-01), Betti et al.
patent: 5451901 (1995-09-01), Welland
Manfred Lang, "The Intermodulation Problem in Mobile Communications" by Manfred Lang;. Microwave Journal; May 1995, pp. 20-28.
"A DC to 1-Ghz Differential Monolithic Variable-Gain Amplifier" by Robert G. Meyel; IEEE 1991, pp. 1673-1679.
"A Wideband Low-Noise Variable-Gain Bi-CMOS Transimpedance Amplifier" by Robert G. Meyer; IEEE 1994, pp. 2/7-7/7.
"HBT Technology Adds Power to CDMA Chip Set" By Jerry Neal; Microwave & RF, Dec. 1994, pp. 205-207.
"Design of High-Performance Negative-Feedback Amplifiers", by Ernst H. Nordholt Studies in Electrical and Electronic Engineering 7, 1983, pp. 34-135.
"A Downconverter for Use in a Dual-Mode AMPS/CDMA Chip Set" By A. Brunal et al. Microwave Journal, Feb. 1996, pp. 20-42.

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