Amplifiers – Combined with automatic amplifier disabling switch means
Patent
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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Edmonston Brian S.
Martin Roger W.
Miller Russell B.
Mullins James B.
Qualcomm Incorporated
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