Current amplifiers

Details Current amplifiers Current amplifiers

1984-10-26

1986-06-24

Mullins, James B.

Amplifiers

With periodic switching input-output

330 51, 330295, H03F 102, H03F 368

Patent

active

045969566

ABSTRACT:
An electrometer amplifier with automatic zero-error correction in which the input current is switched periodically between two amplifier channels by twin reed switches 2,2', the channel outputs being switched in synchronism (15,15') to a common output 19. Each channel includes a current-to-voltage converter 3,4; 3',4' feeding an amplifier 8,9; 8',9', followed by an integrator and store 11,12,13; 11',12',13' whose output is continuously fed back negatively to the input of this amplifier but whose input is synchronously switched (10,10') into connection with the amplifier output only when that channel is disconnected from the input terminal 1. During the latter period capacitors 13,13' store a voltage corresponding to the zero error in the circuitry preceding amplifiers 8,8', so that the stored value (periodically updated) continues to cancel the zero error when terminal 1 is reconnected to that channel and switch 10,10' reopens.

REFERENCES:
Jaeger, R. C., Hellwarth, G. A., "Dynamic Zero-Correction Method Suppresses Offset Error in OP Amps", Electronics, Dec. 4, 1972, pp. 109-110.

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