Analog-to-digital converter with controlled ladder network

Details Analog-to-digital converter with controlled ladder network Analog-to-digital converter with controlled ladder network

1976-01-28

1977-07-05

Sloyan, Thomas J.

Communications: electrical

Audible indication

Percussion-type sound producer

340347DA, 340347M, H03K 1302

Patent

active

040343669

ABSTRACT:
An analog-to-digital converter of the successive-approximation type including a digital-to-analog converter (DAC) comprising a plurality of independently-switchable current sources producing identical currents and connected to respective junction points of an R-2R ladder network. The common ladder terminal is driven by an operational amplifier so that the potential of the common terminal tracks that of the ladder output terminal. The ladder common terminal is connected to a comparator together with a sense ground lead. The output of the comparator is directed to bit sequencer circuitry which controls the switching of the DAC current sources to effect a match between the analog input current and the ladder output current.

REFERENCES:
patent: 3505668 (1970-04-01), Ottesen
Analog Devices, Inc., Analog-Digital Conversion Handbook, June, 1972, pp. II-34 to II-41 & II-80 to II-83.

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