Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1980-09-02
1983-05-17
Sloyan, T. J.
Communications: electrical
Audible indication
Percussion-type sound producer
340347M, H03K 1303
Patent
active
043842747
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 quantized 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: 4045703 (1977-08-01), Moench
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/72, pp. II-56 to II-59.
Schmid, Electronic Analog/Digital Conversions, Van Nostrand Reinhold Co., 1970, pp. 8-10.
American Microsystems, Inc.
Caserza Steven F.
Franklin Richard
MacPherson Alan H.
Sloyan T. J.
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