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High Speed Sampling Voltmeter

IP.com Disclosure Number: IPCOM000093137D
Original Publication Date: 1967-May-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Collins, CA: AUTHOR [+4]

Abstract

This voltmeter circuit is a modified slide-back sensing circuit. It has a frequency response which enables the detection of narrow pulses and allows the level of the input signal to be detected at a given time after initiation. The DC output voltage VB of this voltmeter changes proportionally to the instantaneous input voltage Vin that is coincident with a sampling strobe pulse occurence and can be employed to detect positive or negative voltages.

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High Speed Sampling Voltmeter

This voltmeter circuit is a modified slide-back sensing circuit. It has a frequency response which enables the detection of narrow pulses and allows the level of the input signal to be detected at a given time after initiation. The DC output voltage VB of this voltmeter changes proportionally to the instantaneous input voltage Vin that is coincident with a sampling strobe pulse occurence and can be employed to detect positive or negative voltages.

A feature of the circuit is the Detector Section employing tunnel diode TD. The latter is used as a fast current detector in response to the bias of the Bias Circuit and the input signal to which a strobe pulse is added. Thus, as soon as TD detects a signal which is the addition of the input signal and the strobe pulse, TD switches to its high voltage stage.

The firing of TD presents a high voltage to the input of operational amplifier 1. The output of amplifier 1 is fed back through the RAYSISTOR* 2 and operational amplifier 3 to the cathode of TD. Such occurs with a polarity inverse to the positive change which appeared across TD to reduce the bias applied to it. Each time TD fires, the bias voltage decreases by a small amount while TD remains in its high state and before the next pulse from Reset Generator 4 brings TD back to its low state.

The reset pulse of Generator 4 has a frequency several times slower than the input signal frequency. Also the strobe signal of Strobe Pulse Generator 5 is large in magnitude in comparison to the input signal. Both the input signal and the strobe signal are required...