Current comparator for an improved analog-to-digital converter m

Details Current comparator for an improved analog-to-digital converter m Current comparator for an improved analog-to-digital converter m

1976-07-19

1978-09-12

Sloyan, Thomas J.

Communications: electrical

Audible indication

Percussion-type sound producer

307362, 307363, 340347M, H03K 1303

Patent

active

041141490

ABSTRACT:
A circuit for sensing the polarity of a net input current at a current summing node. The circuit has low impedance differential voltage outputs, accepts large input current overloads, has fast recovery, low input impedence, wide bandwidth and high sensitivity. The circuit is particularly well suited for improving the performance of analog-to-digital converters of the type which match, through successive trials at a summing node, the output of a digital-to-analog converter with an unknown input signal. The invention replaces a voltage comparator conventionally connected at such a summing node and allows such improved converters to be clocked faster. Higher speed operation is possible because the effect of the capacitance at the output of the digital-to-analog converter is reduced thereby shortening the voltage settling time at the summing node.

REFERENCES:
patent: 3573796 (1971-04-01), Querishi
patent: 3577194 (1971-05-01), Beall
patent: 3678501 (1972-07-01), Prill
patent: 4004158 (1977-01-01), Morgan
patent: 4032801 (1977-06-01), Fulkerson
Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, Jun. 1972, pp. III-80 to III-82.

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