Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1982-09-24
1986-06-10
Sloyan, T. J.
Communications: electrical
Audible indication
Percussion-type sound producer
340347M, 375 30, H03K 1303
Patent
active
045945772
ABSTRACT:
An integrated circuit digital to analog converter comprised of MOS current mirrors and utilizing additional MOS devices to provide transmission gates and control means. Each transmission gate 36 is connected to a source of digital data to be converted and the mirroring device for each transmission gate 36 has a channel width with some predetermined proportional relationship to the channels of input transistors 12 and mirroring output MOS transistors 14 to 44 with the input transistor 12 connected to a constant current source, the total output mirroring current of the output mirroring transistors is in quantised analog form and varies according to the cumulative currents from the mirroring MOS transistors as the transistors are activated. The invention may be embodied in linear multiplying, non-linear and companding converters.
REFERENCES:
patent: 3579227 (1971-05-01), Appelgren
patent: 4045793 (1977-08-01), Moench
patent: 4311988 (1982-01-01), Kelley et al.
patent: 4408190 (1983-10-01), Nagano
"Electronic Analog/Digital Conversions", by Hermann Schmid, General Electric Company, USPTO Library (7/6/71), pp. 8-11.
"Analog-Digital Conversion Handbook", by The Engineering Staff of Analog Devices, Inc., Edited by Daniel H. Sheingold, Jun. 1972, pp. 11-56 thru 11-59.
American Microsystems, Inc.
Caserza Steven F.
Hite Eppa
MacPherson Alan H.
Sloyan T. J.
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