Variable gain amplifier circuit

Details Variable gain amplifier circuit Variable gain amplifier circuit

1995-06-07

1996-12-03

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including gain control means

330 86, H03G 312

Patent

active

055812139

ABSTRACT:
A non-attenuating automatic variable gain amplifier (VGA) circuit includes an operational amplifier (op amp) with a feedback resistor connected between its output and inverting input terminals. A variable gain setting resistance circuit having a variable resistance is the gain setting resistor positioned between the op amp's inverting input and a low voltage supply. By varying the resistance of the variable resistance circuit, the gain of the VGA circuit can be manipulated without requiring attenuation of the input signal. A resistance setting control for the variable resistance circuit can operate open loop, fed back from the amplifier output, or fed forward from the amplifier input.

REFERENCES:
patent: 4755771 (1988-07-01), Sakaida et al.
patent: 5077541 (1991-12-01), Gilbert
patent: 5387879 (1995-02-01), Satoh
Grebene, Bipolar and MOS Analog Integrated Circuit Design, John Wiley & Sons, Inc. 1984, pp. 310-314.
Gilbert, Barrie, A Low-Noise Wideband Variable-Gain Amplifier Using an Interpolated Ladder Attenuator, IEEE International Solid-State Circuits Conference (1991), pp. 280-281, 330.

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