Constant-current digital-to-analog converter

Details Constant-current digital-to-analog converter Constant-current digital-to-analog converter

1976-04-07

1978-04-25

Gruber, Felix D.

Communications: electrical

Audible indication

Percussion-type sound producer

307264, 307279, 307297, H03K 1304, H03K 112

Patent

active

RE0296198

ABSTRACT:
A digital-to-analog converter the output circuit of which comprises a set of switching transistors arranged as current generators. The currents through the switching transistors are maintained constant by means of a supply voltage adjusting circuit comprising a separate reference transistor matched to one of the switching transistors and energized by the same voltage supply lines as the switching transistors. The supply voltage adjusting circuit includes an operational amplifier which senses the collector current of the reference transistor, and adjusts the supply voltage so as to maintain that collector current constant. This automatic adjustment of the supply voltage also maintains the current through the switching transistors constant.

REFERENCES:
patent: 3185932 (1965-05-01), Walker
patent: 3281832 (1966-10-01), Schwartz
patent: 3401386 (1968-09-01), Yanishevsky
patent: 3487304 (1969-12-01), Kennedy
patent: 3573795 (1971-04-01), Bowers et al.
patent: 3611353 (1971-10-01), Shipp
patent: 3614776 (1971-10-01), Eshleman
patent: 3623077 (1971-11-01), Clark
Hoeschele: Analog-to-Digital/Digital-to-Analog Conversion Techniques, 1968, pp. 168-178.
General Electric Transistor Manual, 7th Edition, 1964, pp. 227-234.
Pastoriza et al., A High Performance Monolithic D/A Converter Circuit, 1970 IEEE International Solid State Circuits Conference, (Feb. 1970), pp. 122, 123 of Digest (Technical Papers).

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