Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1974-09-12
1976-06-01
Sloyan, Thomas J.
Communications: electrical
Audible indication
Percussion-type sound producer
307244, H03K 1304, H03K 1756
Patent
active
039613267
ABSTRACT:
An integrated-circuit 12-bit digital-to-analog converter comprising binarily-scaled constant-current sources with associated switch cells employing bipolar transistors to direct the bit currents either to a summing bus or to ground. The switch cells include a first differential transistor pair to translate a single-ended binary logic signal to double-ended (balanced) format, and a second, fully-balanced differential pair operated by the balanced logic signal to direct the bit current correspondingly. A bias-generating circuit maintains a constant collector-base voltage at the constant-current source. The threshold voltage for the logic signals can be set for TTL logic or, by pin-programming, for CMOS logic of either low-voltage or high-voltage type.
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Dooley, "A Complete Monolithic 10-Bit D/A Converter," IEEE International Solid-State Circuits Conference, Feb. 1973, pp. 12-14.
Maddox, "Current-Steering Chip Ungrades Performance of D/A Converter," Electronics, Apr. 1974, pp. 125-130.
Analog Devices Inc.
Sloyan Thomas J.
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