Method and apparatus for temperature compensating a digital to a

Details Method and apparatus for temperature compensating a digital to a Method and apparatus for temperature compensating a digital to a

1988-05-02

1990-02-06

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341119, 341133, H03M 178

Patent

active

048991520

ABSTRACT:
A current-source ladder digital-to-analog converter is compensated for temperature changes by making the total current running through the converter proportional to absolute temperature and by terminating the parallel transistor chain forming the current source ladder with a transistor whose emitter voltage is greater than the emitter voltage of the least significant bit current source transistor by 2(KT/q)ln 2 volts. The aformentioned voltage difference is achieved by making the emitter area of the termination transistor at least eight times the emitter area of the least significant bit transistor.

REFERENCES:
patent: 3747088 (1973-07-01), Pastoriza
patent: 3940760 (1976-02-01), Brokaw
patent: 3978473 (1976-08-01), Pastoriza
patent: 4020486 (1977-04-01), Pastoriza
patent: 4176344 (1979-11-01), Saari et al.
patent: 4349811 (1982-09-01), Brokaw

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