Temperature compensated current source operable to drive a curre

Details Temperature compensated current source operable to drive a curre Temperature compensated current source operable to drive a curre

1993-02-11

1997-02-18

Dolinar, Andrew M.

Oscillators

Frequency stabilization

Temperature or current responsive means in circuit

323907, H03L 102

Patent

active

056044674

ABSTRACT:
A temperature compensated current source for driving a multi-vibrator (19) includes a voltage generator (10) that outputs a voltage that is proportional to absolute temperature (PTAT) and a resistor (12) for setting the current output by the voltage generator (10). The temperature coefficient of the resistor (12) is chosen such that any variations in the current supplied by the voltage generator (10) are compensated for to result in a current that has substantially no temperature variation. This current is mirrored to a current source (18) for driving the multi-vibrator (19). The voltage across the resistor (12)is a function of temperature, with the current being a function of the value of the resistor (12). The temperature coefficient of the resistor (12) is substantially equal to the temperature coefficient of the voltage generator (10) to yield a temperature coefficient of substantially 0 ppm/.degree.C. for the current.

REFERENCES:
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patent: 4978930 (1990-12-01), Suter
patent: 5162678 (1992-11-01), Yamasaki
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"MOS Amplifier Design" ( p. 734) in Analysis and Design of Analog Integrated Circuits by Paul R. Gray and Robert G. Meyer, John Wiley & Sons, 1984. (Month unknown).

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