Gain controllable output buffer amplifier circuit having a reduc

Details Gain controllable output buffer amplifier circuit having a reduc Gain controllable output buffer amplifier circuit having a reduc

1993-08-04

1995-02-07

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including gain control means

330 86, H03G 312

Patent

active

053878795

ABSTRACT:
A gain-controllable output buffer amplifier circuit includes an operational amplifier having a grounded non-inverting input and an inverting input connected through an input resistor to a signal input node. A tapped feedback resistor having a plurality of intermediate taps is connected between an output and the inverting input of the operational amplifier. Each of the intermediate taps is connected through a transistor switch in common to a non-inverting input of an output buffer amplifier, which has its output connected to a signal output node and an inverting input of the output buffer amplifier itself. The transistor switches are controlled by a switch control circuit in such a manner that only one of transistors switches is selectively turned on.

REFERENCES:
patent: 4599574 (1986-07-01), Chambers

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