High impedance amplifier for an IC chip

Details High impedance amplifier for an IC chip High impedance amplifier for an IC chip

1983-08-17

1985-12-10

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307501, 307548, 307560, 307576, 330284, H03K 3023

Patent

active

045582394

ABSTRACT:
A high impedance is implemented in the input bias path of an integrated instrumentation amplifier. The implementation includes a normally on transistor switch. A signal from the output of the amplifier is used to turn the switch off to provide the requisite high impedance. Otherwise, the switch is on to provide low impedance for proper biasing. The circuit is adapted for encoded input signals such as occur in capacitive coupled credit card encoding circuits.

REFERENCES:
patent: 3537025 (1970-10-01), Baum et al.
patent: 3591854 (1971-07-01), Cole
patent: 4093874 (1978-06-01), Pollitt
patent: 4125789 (1978-11-01), Van Schoiack
patent: 4200843 (1980-04-01), Egami et al.
patent: 4341963 (1982-07-01), Jensen et al.
patent: 4350964 (1982-09-01), Chambers, Jr.
patent: 4525636 (1985-06-01), Kominami et al.

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