Biasing circuit for generating precise currents in an integrated

Details Biasing circuit for generating precise currents in an integrated Biasing circuit for generating precise currents in an integrated

1988-08-16

1990-01-09

Hudspeth, David

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

3072967, 323315, G05F 156

Patent

active

048930300

ABSTRACT:
An integrated circuit chip is fabricated with an operational active device and a nearly-identical, exemplary active device. The exemplary device is connected in series with a current reference element so that current flow through the reference element will be substantially duplicated in the exemplary device. A difference amplifier senses the output voltage of the exemplary device; compares it to a provided reference voltage; and generates a gate biasing level at the gate of the exemplary device to force the output voltage of the exemplary device substantially equal to the reference voltage. The biasing level at the gate of the exemplary device is duplicated at the gate of the operational device thereby creating a condition wherein the output current of the operational device will be a substantially precise replica of the current flow through the reference element when the reference voltage is duplicated across the output of the operational device.

REFERENCES:
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patent: 4446419 (1984-05-01), vande Plassche et al.
patent: 4453094 (1984-06-01), Peil et al.
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patent: 4602207 (1986-07-01), Kim et al.
patent: 4629973 (1986-12-01), Voorman
patent: 4642551 (1987-02-01), Miller
patent: 4647841 (1987-03-01), Miller
Millman & Halkias, Integrated Electronics: Analog and Digital Circuits and Systems, pub. by McGraw-Hill, Inc., New York, 1972, pp. 501-504.

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