Coded data generation or conversion – Analog to or from digital conversion – Bipolar
Patent
1991-03-28
1992-07-07
Pellinen, A. D.
Coded data generation or conversion
Analog to or from digital conversion
Bipolar
341135, 341153, H03M 180
Patent
active
051286742
ABSTRACT:
A multiplying digital-to-analog converter for multiplying a bipolar input current by a digital word A having N bits a.sub.i including a current adder for adding a constant current to the bipolar input current to produce a unipolar current, a first current mirror responsive to the unipolar current for providing N binary weighted versions of the unipolar current, a second current mirror for providing binary weighted versions of the constant current, N current selection circuits respectively controlled the N bits a.sub.i for providing an output current comprising (a) the correspondingly weighted version of said unipolar current if the associated control bit is in a first state or (b) the correspondingly weighted version of the constant current if the associated control bit is in a second state, and a shifting circuit for summing the outputs of said N current selection means and for shifting the sum current to produce a bipolar output current representative of product of (a) the input bipolar current and (b) the digital word A.
REFERENCES:
patent: 4563670 (1986-01-01), Stallkamp et al.
patent: 4982192 (1991-01-01), Murooka
"Monolithic Multiplying 8-bit DACs Offer High Speed Performance", Computer Design, Feb. 1977, p. 138.
Burns John M.
Kong Kam W.
Ng Tim M.
Alkov Leonard A.
Denson-Low Wanda K.
Hughes Aircraft Company
Logan Sharon D.
Pellinen A. D.
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