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Digital Voltmeter For Peak Pulse Amplitude

IP.com Disclosure Number: IPCOM000098452D
Original Publication Date: 1960-Oct-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 61K

Publishing Venue

IBM

Related People

Sellers, F: AUTHOR

Abstract

The circuit provides a digital indication of the peak voltage appearing on an input line during a short sample time interval. The circuit operates by charging capacitor 13 to the peak value of the input voltage during the sample interval, and then allows the capacitor to discharge at a fixed rate.

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Digital Voltmeter For Peak Pulse Amplitude

The circuit provides a digital indication of the peak voltage appearing on an input line during a short sample time interval. The circuit operates by charging capacitor 13 to the peak value of the input voltage during the sample interval, and then allows the capacitor to discharge at a fixed rate.

The potential across the capacitor 13 at any time T is equal to the original potential V(o) across the capacitor multiplied by a capacitor discharge function f(o)(t) which varies inversely with time. This potential is continuously compared with a potential from generator 14 which is the product of a signal varying directly with time, a ramp signal AT, and a signal having the same function f(c)(t) mentioned above.

At a time T(e) when the potentials being compared are equal the following relationships exist: V(o)f(c)(T(e))= AT(e)f(c)(T(e)) or V =AT. The time T(e) required for the voltages being compared to reach the same value is therefore proportional to the initial potential V(o) across the capacitor, and is, in this circuit, employed to indicate the peak voltage of the input signal.

The sampling or sync signal on line 10 gates the input signal on line 11 to capacitor 13, initiates operation of the generator 14 to produce the voltage. The latter is compared with the capacitor voltage and flips trigger 15, conditioning gate 16 to allow clock pulses from generator 17 to pass to counter 18.

The time constants of the capacitor circ...