Digital-to-analog converter

Details Digital-to-analog converter Digital-to-analog converter

1980-09-08

1983-11-15

Sloyan, T. J.

Communications: electrical

Audible indication

Percussion-type sound producer

340347M, 370 6, 370113, H03K 1302

Patent

active

044158815

ABSTRACT:
An analog-to-digital converter for converting analog signals received in parallel on a plurality of incoming lines into digital signals comprises a selector unit having a plurality of signal inputs. Each input is connected to an incoming line via a filter capacitor. A grounded network connected to an output of the selector unit has a storage capacitor and a switch arranged in parallel for short-circuiting the capacitor temporarily. The network simulates a common resistor for establishing a filter section together with the presently through-connected filter capacitor. One input of a comparator is connected to the selector output. The second input is supplied by an analog reference voltage source which may comprise a digital-to-analog converter for supplying an analog reference voltage adjustable under control of the current condition of the comparator output signal. The reference voltage thus is iteratively approximated to the current analog value of the stored sampling probe.

REFERENCES:
patent: Re30294 (1977-11-01), Hoeffer
patent: 3735392 (1973-05-01), Kaneko
patent: 3819864 (1974-06-01), Carroll
patent: 3984829 (1976-10-01), Zwack
patent: 4017687 (1977-04-01), Hartzler et al.
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/72, pp. I-2 to I-5; II-46 to II-48, III-78 to III-83.
Calkins et al., Data Acquisition in a Dip Shrinks Systems, Electronics, Jul. 8, 1976, pp. 77-83.
Millman et al., Pulse and Digital Circuits, McGraw-Hill Book Co., Inc., 1956, pp. 28-36.
Moschytz et al., "Transmission Matrix of Switched-Capacitor Ladder Networks: Application in Active-Filter Design" Art. from IEE Proc., vol. 127, Pt. G, Apr. 1980, pp. 87-98.
Herbst et al., "Mos Switched-Capacitor Filters", Art. from IEEE Int. Solid State Circuits Conf. vol. XXII No. (1979-02), pp. 74, 75 and 281.

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