Digital-to-analog converting apparatus equipped with calibrating

Details Digital-to-analog converting apparatus equipped with calibrating Digital-to-analog converting apparatus equipped with calibrating

1987-03-06

1989-05-30

Roskoski, Bernard

Coded data generation or conversion

Converter calibration or testing

H03K 1302

Patent

active

048355356

ABSTRACT:
In a D/A converting apparatus which provides a converted analog signal at its output terminal by selectively yielding one or more currents from one or more current sources in accordance with an input digital signal, the current sources are selectively actuated to output the currents and an error in the current of each selected current source is obtained from the output derived at the output terminal in response to the outputting of the current. From the current error of each current source is computed a final error corresponding to each input digital signal and corrected data corresponding to the final error is stored in a corrected data memory, which is read out by the input digital signal. The output thus read out is converted into an analog signal, whereby a correct converted output is obtained.

REFERENCES:
patent: 3217147 (1965-11-01), Chapman, Jr.
patent: 4272760 (1981-06-01), Prazak et al.
patent: 4336526 (1982-06-01), Weir
Rullgard, Controlling a Number of Predetermined Currents, IBM Technical Disclosure Bulletin, vol. 10, No. 1, 6/1967, pp. 5 & 6.
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/1972, pp. I-8 & 9; I-54 to 59; II-20 & 21.

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