Programmable gain amplifier

Details Programmable gain amplifier Programmable gain amplifier

1992-01-09

1993-08-03

Mullins, James B.

Amplifiers

Signal feedback

Plural amplifier channels

330 86, 330144, 330282, 330284, H03G 300, H03F 368

Patent

active

052333094

ABSTRACT:
A programmable gain amplifier including first and second gain elements are connected by an impedance selector which allows programmability of the gain of both gain elements. The impedance selector is connected in series with the output of the first gain element. The impedance selector places an impedance in the feedback path of the first gain element or the input path of the second gain element. Errors introduced in the signal path due to the switches are attenuated by the open loop gain of the first gain element. The gain may be equally divided between both stages of the amplifier to allow for optimum band width. Optimum noise performance may be obtained by placing most of the gain in the first stage. An instrumentation amplifier may also be made which further includes a third gain element connected to the gain element with a second impedance selector in a manner similar to the connection of the first gain element to the second gain element.

REFERENCES:
patent: 3355670 (1967-11-01), Pastoriza
patent: 4354159 (1982-10-01), Schorr et al.
patent: 4396890 (1983-08-01), Kato et al.

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