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Voltage Programmable Resistor

IP.com Disclosure Number: IPCOM000090175D
Original Publication Date: 1969-Feb-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Perkins, MH: AUTHOR

Abstract

In electronic test equipment discrete resistors are switched to a device under test, for loading, etc. This circuit provides a large selection of resistors in addition to higher speed resistance changes. An analog divider divides the input voltage E(1) by the digital-to-analog converter voltage E(2), feeding the result into the constant current generator. The constant current generator forces a current at the input A to the device under test, which current is proportional to E(1)/E(2), the digital-to-analog converter output voltage. Thus the resistance seen between point A and ground B is determined by the output of the digital-to-analog converter, which output can be computer controlled and changed at very high speeds.

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Voltage Programmable Resistor

In electronic test equipment discrete resistors are switched to a device under test, for loading, etc. This circuit provides a large selection of resistors in addition to higher speed resistance changes. An analog divider divides the input voltage E(1) by the digital-to-analog converter voltage E(2), feeding the result into the constant current generator. The constant current generator forces a current at the input A to the device under test, which current is proportional to E(1)/E(2), the digital-to-analog converter output voltage. Thus the resistance seen between point A and ground B is determined by the output of the digital-to-analog converter, which output can be computer controlled and changed at very high speeds.

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