Variable gain amplifier circuit

Details Variable gain amplifier circuit Variable gain amplifier circuit

1994-08-01

1995-06-13

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330257, 330260, 330278, H03G 330

Patent

active

054246822

ABSTRACT:
A variable gain control circuit (10) provides an output signal having a gain dependent on first (34) and second (52) reference current sources. An amplifier circuit (14, 20) generates first and second dynamic control voltages that control current flow through an input stage (30) referenced to the first reference current source. The dynamic control voltages produce similar currents in an output stage (32) referenced to the second reference current source. The dynamic control voltages to the input and output stage allow the variable gain amplifier circuit to operate with low power supply potentials which is especially useful in battery applications.

REFERENCES:
patent: 4516081 (1985-05-01), Katakura
patent: 4878031 (1989-10-01), Main

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