Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1986-07-18
1988-03-22
Sloyan, T. J.
Communications: electrical
Audible indication
Percussion-type sound producer
340347CC, 340347M, 377 70, 377 75, H03M 178
Patent
active
047332182
ABSTRACT:
A combined digital-to-analog converter and latch memory circuit (10) includes an R-2R resistive ladder network (12) and a current-controlled latch memory 18. The R-2R resistive ladder network has plural input nodes (100 and 102) and an analog signal output (104). Each of the input nodes corresponds to a different bit of a digital word that is to be converted to an analog signal. The current-controlled latch memory includes plural subcircuits (14 and 16). Each of the latch subcircuits uses an amount of current to store the logic state of the bit of the digital word and to derive directly the node of the R-2R resistive ladder network. This configuration promotes the efficient use of space, power, and circuit elements.
REFERENCES:
patent: 4400690 (1983-08-01), Brokaw et al.
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/1972, pp. I-8 & I-9; II-46 to II-49.
Millman et al., Pulse and Digital Circuits, 1956, pp. 410-413.
"Bipolar and MOS Analog Integrated Circuit Design", Grebene, (Wiley-Interscience, New York, 1984), pp. 754-760, 826-827, and 846-848.
Angello Paul S.
Lovell William S.
Sloyan T. J.
Tektronix Inc.
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