Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1987-11-09
1989-08-08
Miller, Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307494, 307315, 307454, 307280, 357 46, 357 44, 330257, H03K 326
Patent
active
048556254
ABSTRACT:
An input circuit for an operational amplifier which incorporates a bias control transistor for effectively minimizing the input current to a Darlington-connected transistor pair into the same semiconductor region in which the Darlington-connected transistor pair is formed. All portions of the surface of the dielectrically isolated island are effectively boot-strapped with the (common mode) input signal, whereby the parasitic capacitance to ground is effectively eliminated. This enables the collector current of the input transistor to be reduced significantly relative to the collector current flowing through the output transistor of the Darlington pair. To accommodate for device characteristic variations among separate wafer processing runs, a self-balanced bias circuit, containing a transistor pair matched to the bias and Darlington output transistors, is employed as the current source of the operational amplifier. As a result, the ratio of the collector currents of the Darlington-connected pair can be controlled irrespective of saturation currents or sheet resistivity of bias resistances employed for the bias control transistor and for the self-balanced bias circuit respectively.
REFERENCES:
patent: 3092729 (1963-06-01), Cray
Harris Corp.
Miller Stanley D.
Thai Nancy
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