High accuracy digital-to-analog converter having symmetrical cur

Details High accuracy digital-to-analog converter having symmetrical cur High accuracy digital-to-analog converter having symmetrical cur

1986-04-07

1987-09-22

Sloyan, T. J.

Communications: electrical

Audible indication

Percussion-type sound producer

340347CC, 340347M, 323317, H03M 174

Patent

active

046958266

ABSTRACT:
A digital-to-analog converter includes a plurality of constant current sources (401-407) arrayed in a prescribed order and connected with a grounding lead wire (70). The respective constant current sources (401-407) are selectively connected to a first bus (303) by corresponding switches (501-507), respectively. A decoder (2) outputs switching signals to the switches (501-507). The switching signals are outputted from the decoder (2) to the switches (501-507) so that the constant current sources symmetrically positioned with respect to the center of an array of the plurality of constant current sources (401-407) are sequentially connected to the first bus (303). Thus, the digital-to-analog converter is improved in linearity.

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The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/1972, pp. II-46 to II-49.
Bob Peterson, Inherently Monotonic DAC-IC Design Eliminates Costly Resistor Matching, Electronic Design News, vol. 24, No. 5 (Mar. 5, 1979): 46, 50.

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