Highly symmetrical bi-direction current sources

Details Highly symmetrical bi-direction current sources Highly symmetrical bi-direction current sources

1996-12-03

1998-06-02

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

327530, 327538, G05F 110

Patent

active

057606404

ABSTRACT:
A bi-directional current source which maintains accurate, substantially equal source and sink currents over a large range of output voltages. The current source includes a primary field effect transistor (FET) and two mirroring FET's. It additionally includes at least one operational amplifier for voltage balancing. An optional operational amplifier provides and additional bias voltage and transistor matching optionally provides impedance matching of the supply voltages.

REFERENCES:
patent: 5212458 (1993-05-01), Fitzpatrick et al.
patent: 5266887 (1993-11-01), Smith
IEEE Journal of Solid-State Circuts, vol. 27, No. 11, 1 Nov. 1992, pp. 1599-1606, XP000320789, Young, I.A. et al "A PLL Clock Generator with 5 to 110 MHz of Lock Range for Microprocessors".
Proceedings of the Customer Integrated Circutis Conference, Boston, May 3-6, 1992, No. Conf. 14, 3 May 1992, Institute of Electrical and Electornics Engineers, pp. 24.3.1-14.3.5 Huehne, K. et al "A Single-Chip, 1.2 GHz, PLL Frequency Synthesizer Using Reduced Capacitance, Dual Gate, BICMOS Tehcnology".

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