Chopper amplifier for measuring low DC current

Details Chopper amplifier for measuring low DC current Chopper amplifier for measuring low DC current

1991-04-08

1992-05-12

Mottola, Steven

Amplifiers

Modulator-demodulator-type amplifier

73304R, H03F 338

Patent

active

051131439

ABSTRACT:
A current mode chopper amplifier is used to convert low dc current flowing in a resistive element into ac for signal processing to eliminate drift and noise. The ac signal is then converted back to dc as output. The input circuit for the chopper is an operational amplifier driving a pass transistor and serving also as a voltage follower, which drives the resistive element. A polarizing voltage is applied to the input of the operational amplifier, and followed by the resistive element. The current in the resistive element flows through the pass transistor to the chopper, but not through the polarizing voltage source.

REFERENCES:
patent: 4765187 (1988-08-01), Weinstein
patent: 4912423 (1990-03-01), Milkovic et al.
patent: 5049878 (1991-09-01), Stern

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