Integrable digital/analog converter

Details Integrable digital/analog converter Integrable digital/analog converter

Filed on

1982-10-25

Date issued

1985-11-05

Examiner

Sloyan, T. J.

Patent Class

Communications: electrical

SubClass

Audible indication

SubSubClass

Percussion-type sound producer

Other Related Categories

340347CC, 340347M, H03K 1302

Type

Patent

Status

active

Patent number

045517096

Description

ABSTRACT:
Integrable digital/analog converter, comprising a reference d-c voltage or current source having two terminals, a conductor network having an input connected to the first terminal of the reference d-c source and having outputs, a plurality of double-throw switches each being in the form of a pair of transistors being controlled together by a digital signal to be evaluated, the double-throw switches each having a first current-carrying terminal connected to the second terminal of the reference d-c source through ground, a second current-carrying terminal carrying current in both of the switching positions each being connected to one of the outputs of the conductor network, and a third current-carrying terminal, a common operational amplifier forming an output of the converter and having an inverting input connected to each of the third terminals, a resistor being connected to the operational amplifier in a negative feedback loop, and a device for weighting the double-throw switches to individually set the internal resistance .theta..sub.i thereof according to the relationship:

REFERENCES:
patent: 4267550 (1981-05-01), Cecil
patent: 4381499 (1983-04-01), Struthoff
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/1972, pp. II-36 to II-39.

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