Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1981-10-09
1984-02-14
Sloyan, T. J.
Communications: electrical
Audible indication
Percussion-type sound producer
340347DA, 340347M, H03K 1302
Patent
active
044319860
ABSTRACT:
A digital to analog converter (100) utilizes a current mirror connected to a reference voltage (V.sub.REF) to generate a constant reference current (I.sub.REF). A voltage divider (R.sub.1 and R.sub.2) is used in conjunction with a plurality of MOS transistors (X.sub.1 -X.sub.N) serving as current mirrors having specific current carrying capabilities which are controlled by selected binary digits (bits) of a digital signal. By the appropriate connection of desired ones of said plurality of MOS transistors, a specific fraction of said reference current is caused to flow through said plurality of MOS transistors. The amount of current flowing through said plurality of MOS transistors generates an output voltage (V.sub.OUT) from the digital to analog converter of this invention. This output voltage may be positive or negative with respect to the reference voltage, thus the output voltage is bipolar.
REFERENCES:
patent: 3217147 (1965-11-01), Chapman, Jr.
patent: 3474440 (1966-10-01), Schmid
patent: 4045793 (1977-08-01), Moench
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/1972, pp. I-33 & 34; II-46 through II-48.
Haque Yusuf A.
Saletore Vikram
Schuler Jeffrey A.
American Microsystems, Incorporated
Caserza Steven F.
Franklin Richard
MacPherson Alan H.
Sloyan T. J.
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