Digital-to-analog converter having a circuit for compensating fo

Details Digital-to-analog converter having a circuit for compensating fo Digital-to-analog converter having a circuit for compensating fo

1991-03-19

1992-07-28

Logan, Sharon D.

Coded data generation or conversion

Converter compensation

Temperature compensation

341133, 341154, H03M 106, H03M 178

Patent

active

051343983

ABSTRACT:
A D/A converter converting a digital signal having n bits (n is an integer) into an analog signal includes constant-current output circuits, provided for the n bits of the digital signal, for selectively generating n constant currents on the basis of the n bits of the digital signals. The n constant currents have mutually different current values with respect to the n bits of the digital signal. The constant-current output circuits have resistance elements respectively provided for the n bits of the digital signal. The resistance elements define the mutually different current values. The D/A converter also includes an output circuit for adding the n constant currents to each other and for outputting the analog signal based on an addition result, and a temperature-dependent voltage generating part for generating a temperature-dependent voltage which changes as a temperature around the D/A converter changes. Further, the D/A converter includes a current compensation part for generating a compensation voltage related to at least one of the resistance elements from the temperature-dependent voltage and for applying the compensation voltage to the one of the resistance elements. The compensation voltage compensates for a temperature-dependent variation in a characteristic of the one of the resistance elements.

REFERENCES:
patent: 3842412 (1974-10-01), Spofford, Jr.
patent: 3932863 (1976-01-01), Pastoriza
patent: 3940760 (1976-02-01), Brokaw
patent: 4176344 (1979-11-01), Saari et al.

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