Variable gain current-to-voltage amplifier with gain independent

Details Variable gain current-to-voltage amplifier with gain independent Variable gain current-to-voltage amplifier with gain independent

1988-10-26

1990-01-23

Mullins, James B.

Amplifiers

With amplifier condition indicating or testing means

324616, G01R 1900

Patent

active

048961183

ABSTRACT:
The present invention provides a precision variable gain current-to-voltage amplifier which has a test mode of operation wherein the gain is independent of the gain of the amplifier when operated in the normal amplification mode. The invention enables a test signal, preferably a test voltage, to be injected into the amplifier circuit to test the functioning of the op amp and thus the amplifier. Because the gain of the amplifier in the test mode is independent of the gain of the amplifier when in the normal mode, a simple and easy method of checking the functioning of the op amp is provided which does not require knowing the gain of the amplifier and then selecting the proper test input to use.

REFERENCES:
patent: 3718857 (1973-02-01), Bernard

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