Digital to analog converter having integrated digital and analog

Details Digital to analog converter having integrated digital and analog Digital to analog converter having integrated digital and analog

1983-07-25

1986-08-19

Sloyan, T. J.

Communications: electrical

Audible indication

Percussion-type sound producer

340347CC, 340347M, 307591, 328 55, H03K 1302

Patent

active

046072489

ABSTRACT:
A D/A converter for converting a digital signal having a number of bits to an analog signal. The converter is fabricated in an integrated circuit digital array including a register for storing the particular number of bits, a buffer circuit for receiving those bits from the register, and an analog current switching network. The analog current switching network includes a number of current switching circuits, each of which provides the proper current output in response to the delivery of an associated bit from the buffer circuit. Each current switching circuit includes an emitter coupled switch circuit having two pluralities of parallel connected transistor cells with the bases of one of the plurality of transistor cells connected with the buffer circuit and the bases of the other of the plurality of transistor cells connected with the current switching circuit. The current switching circuit includes a first transistor cell with its emitter connected to the base of the other of the plurality of transistor cells in the emitter coupled switch circuit. A voltage summing network responsive to the current output from the analog current switching network provides voltages representative of the bit presented by the associated buffer circuit.

REFERENCES:
patent: 3961326 (1976-06-01), Craven
patent: 4045793 (1977-08-01), Moench
Schmid, Electronic Analog/Digital Conversions, Van Nostrand Reinhold Company, 1970, pp. 170-179.

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