Digital-to-analogue converter including calibrated current sourc

Details Digital-to-analogue converter including calibrated current sourc Digital-to-analogue converter including calibrated current sourc

1985-08-26

1987-03-03

Sloyan, T. J.

Communications: electrical

Audible indication

Percussion-type sound producer

340347CC, 340347M, 323270, H03K 1302

Patent

active

046479074

ABSTRACT:
A digital-to-analogue converter includes a plurality of constant current sources and a calibration circuit for measuring the value or relative value of the current provided by one or more of the sources without interrupting operation of the digital-to-analogue converter. The calibration circuit carries out a routine whereby a number of measurements are obtained and averaged. Error signals in accordance with the averaged measurements are produced and used to correct for drift in the components of the current sources. Error correction may be achieved by adjusting the regulators themselves or by adding correction signals at other parts of the circuit.

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patent: 4336526 (1982-06-01), Weir
patent: 4342983 (1982-08-01), Weigand et al.
Electro-81 Conference Record, vol. 6, Apr. 7-9, 1981, pp. 1-8, New York.
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/1972, pp. I-2 & I-3; II-46 to II-49; III-1 to III-5.
Wittlinger, Linear Integrated Circuits RCA Application Note ICAN-6668 Applications of the CA3080 and CA3080A High-Performance Operational Transconductance Amplifiers, pp. 1-7.

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