Integrable digital/analog converter

Details Integrable digital/analog converter Integrable digital/analog converter

1984-09-18

1986-04-15

Hix, L. T.

Communications: electrical

Audible indication

Percussion-type sound producer

H03M 166

Patent

active

045830762

ABSTRACT:
An integrable digital/analog converter in bipolar technology for bits of a digital data word signal to be processed, includes individual converter stages assigned to bits of the signal to be processed, the stages each including a constant current-source transistor with equal doping and weighting like that of the constant current, and a double-throw switch connecting the collector of the current-source transistor to an output terminal or another terminal depending on the logical state of the bit. Emitter series resistors are connected between the emitters of the current-source transistors and an emitter potential supply terminal, the resistors being weighted by different dimensioning. The converter stages are divided into two groups with higher and lower bit values, the emitter areas of the current-source transistors of the first group being weighted. A reference potential circuit is provided for receiving a reference current. A first current reflector is formed of transistors. Two further transistors control the transistors of the first group. Two of the emitter series resistors are connected between the further transistors and the emitter potential supply terminal. A second current reflector is connected to the emitter potential supply terminal and it includes output transistors connected to the current-source transistors of the second group. Transmission transistors are connected to the current-source transistors of the second group and to the reference circuit. The emitter areas of the transmission transistors are binary-weighted according to the bit value associated with the current-source transistors of the second group.

REFERENCES:
patent: 4055773 (1977-10-01), Schoeff
patent: 4384274 (1983-05-01), Mao
Gunter Pretzl, Monolithische D/A-und A/D-Umsetzer, 1977, pp. 38-46 of No. 3.

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