Digital to analog converter using multiple emitter transistors

Details Digital to analog converter using multiple emitter transistors Digital to analog converter using multiple emitter transistors

1979-05-21

1980-07-22

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

307299A, H03K 1302

Patent

active

042142350

ABSTRACT:
This invention is a circuit for the generation of 2.sup.n -step digital signals from n-binary signals which are respectively supplied to the input of emitter followers which are connected with a first multi-emitter transistor, whereas inverse binary signals are respectively supplied to the input of another set of emitter followers which are connected to a second multi-emitter transistor. The emitter connections of both multi-emitter transistors are also respectively connected through stepped current sources to an operating potential. The base connections of the multi-emitter transistors are connected to a reference potential through a common resistor. The collector connections of the multi-emitter transistors are connected to load resistors and serve as output connections. The circuit is particularly suited as a binary multi-stage converter for employment in PCM systems of a very high bit rate.

REFERENCES:
patent: 4118699 (1968-10-01), Comer
Hart et al., "Electronics", Oct. 3, 1974, pp. 111-118.

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