D/A converter with differential switching circuit providing symm

Details D/A converter with differential switching circuit providing symm D/A converter with differential switching circuit providing symm

1994-12-28

1997-03-18

Hoff, Marc S.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341136, H03M 180

Patent

active

056126972

ABSTRACT:
A digital-to-analog converter including a plurality of binarily-weighted stages each incorporating a differential switch-pair circuit which includes two matched bipolar switch transistors the bases of which are driven by a corresponding pair of complementarry signal sources. Two additional switches are included in this circuit, with each such switch being connected between a respective signal source and its corresponding transistor control electrode. These two switches are both opened before the clock-controlled activation of the complementary signal sources. A short time after such activation, sufficient to assure that the complementary signal voltages have stabilized at their new values, the two additional switches are reclosed simultaneously by a single control signal so as to effect synchronized switchover of the two switch transistors at that instant. Capacitors are included to maintain effectively constant the base voltages of the two switch transistors during the time that the two additional switches are open.

REFERENCES:
patent: 5148164 (1992-09-01), Nakamura et al.
patent: 5331322 (1994-07-01), Cha et al.
patent: 5373294 (1994-12-01), Sun
patent: 5450084 (1995-09-01), Mercer

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