Temperature compensated CMOS voltage to current converter

Details Temperature compensated CMOS voltage to current converter Temperature compensated CMOS voltage to current converter

1991-10-29

1993-07-27

Sikes, William L.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307310, 3072021, G06G 710

Patent

active

052313158

ABSTRACT:
A voltage to current converter circuit is provided which outputs a constant current independent of temperature. The temperature coefficient of a first onchip impedance network is canceled by a threshold voltage of a transistor which has a temperature coefficient that tracks the temperature coefficient of the first impedance network. The magnitude of the output current is adjustable using the first impedance network, and does not affect the temperature coefficient. A second impedance network effectively zeros out the temperature coefficient of the circuit by adjusting an input reference voltage assumed to be constant. Furthermore, the present invention uses no bipolar transistors or diodes.

REFERENCES:
patent: 3705316 (1972-12-01), Burrous et al.
patent: 3980963 (1976-09-01), Doi
patent: 4004462 (1977-01-01), Dobkin
patent: 4582659 (1986-04-01), Hilgers
patent: 4730128 (1988-03-01), Seki

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