Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
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.
Kim Suk K.
Meleis Hanafy E. S.
AT&T Bell Laboratories
Caplan David I.
Hudspeth D. R.
Miller Stanley D.
Shapiro Herbert M.
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