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Automatic Test Zone Generation

IP.com Disclosure Number: IPCOM000081184D
Original Publication Date: 1974-Apr-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Davis, JW: AUTHOR

Abstract

In present testing devices for determining voltage levels on a waveform between which a measurement is to be made, time-consuming and complex procedures are required to set the standard voltages for comparison with the waveform. The structure set out in the diagram will automatically set the measurement points which can be changed as desired.

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Automatic Test Zone Generation

In present testing devices for determining voltage levels on a waveform between which a measurement is to be made, time-consuming and complex procedures are required to set the standard voltages for comparison with the waveform. The structure set out in the diagram will automatically set the measurement points which can be changed as desired.

As shown, a first voltage signal will be applied to input terminal 1. The shape of the signal is immaterial, except that it must cover the full voltage range of the signal to be measured. When the first signal is at the low end of the voltage range of the signal to be measured, a gate 2 is pulsed to gate the magnitude of the standard voltage signal into a sample and hold amplifier 3. Later when the first voltage signal at input 1 is at the high end of the voltage range of the signal to be measured, a gate 4 is similarly pulsed to gate the voltage of the standard signal into another sample and hold amplifier 5.

The outputs of the amplifiers 3 and 5 are connected by three resistors 6, 7, and 8 in series, which are selected so that the voltages at their junctions are above the voltage of amplifier 3 by 90% and 10%, respectively, of the difference between the voltages being held by the amplifiers 3 and 5. The 10% voltage is applied to an input of comparator 9 and the 90% voltage is applied to an input of a second comparator 10. The outputs of comparators 9 and 10 are transmitted to a measuring circ...