R-2R digital-to-analog converter having transistors of equal emi

Details R-2R digital-to-analog converter having transistors of equal emi R-2R digital-to-analog converter having transistors of equal emi

1992-01-10

1993-07-27

Hoff, Marc

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341118, H03M 178

Patent

active

052313964

ABSTRACT:
A digital-to-analog converter has a plurality of switches, each of which being responsive to a bit of a digital signal having n bits, to selectively pass therethrough a weighted current having a magnitude of 2.sup.i-1 Ic where i is an ith bit. The respective weighted current flows through a corresponding transistor into a resistor ladder circuit. The resistor ladder circuit has a plurality of arms, each of which receive a weighted current from the emitter of a corresponding transistor. The digital-to-analog converter further includes a plurality of base resistors connected in series such that the bases of the transistors are connected with corresponding junctions of the base resistors r1-r7. The plurality of base resistors carry a first current therethrough. A current control circuit BC for controlling the first current through the series-connected base resistors to maintain emitter voltages of two predetermined transistors of the plurality of transistors such that the emitter voltages of the two predetermined transistors are always the same.

REFERENCES:
patent: 3940760 (1976-02-01), Brokaw
patent: 4176344 (1979-11-01), Saari et al.
patent: 4306225 (1981-12-01), Geller et al.
patent: 4521765 (1985-06-01), Wang et al.
patent: 4567463 (1986-01-01), Naylor
patent: 4701694 (1987-10-01), Penney et al.

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