Improved digital to analog converter providing self compensation

Details Improved digital to analog converter providing self compensation Improved digital to analog converter providing self compensation

1976-09-01

1978-08-15

Sloyan, Thomas J.

Communications: electrical

Audible indication

Percussion-type sound producer

340347CC, 340347M, H03K 1302

Patent

active

041076710

ABSTRACT:
An apparatus and method are disclosed for converting digital input signals of either polarity to representative analog output signals. An internal synchronous counter is clocked to generate internal digital signals of the same code as the input digital signal which are compared with the input digital signal which is stored in a bank of latches. Upon coincidence therebetween, an inhibiting pulse is produced from a coincidence circuit for disabling a buffer-integrator circuit. During the time interval between the enabling of the counter and the inhibiting pulse, the buffer-integrator integrates a single polarity reference voltage provided thereto to establish an analog voltage representative of the stored digital signal. Sample and hold circuits periodically sample the output of the integrator circuit to update and provide the analog output. Self compensation for operational amplifier offsets is provided during each conversion cycle. The converter is suitable to be fabricated using CMOS technology on a single chip and requires no ladder network.

REFERENCES:
patent: 3541446 (1970-11-01), Prozeller
patent: 3646545 (1972-02-01), Naydan et al.
patent: 3654560 (1972-04-01), Cath et al.
patent: 3942173 (1976-03-01), Wold
Bares et al, Combined ADC-DAC, IBM Technical Disclosure Bulletin, vol. 10, No. 9, 2/1968, pp. 1372, 1373.
Grob, "Basic Television, Principles and Servicing," McGraw-Hill Book Co., 1954, pp. 331-333.
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/1972, pp. I-42 to I-45; III-4.

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