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Universal Peak Sensing Detection and Retention Device

IP.com Disclosure Number: IPCOM000096056D
Original Publication Date: 1964-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 21K

Publishing Venue

IBM

Related People

East, DG: AUTHOR [+2]

Abstract

This circuit produces at its output a signal that is proportional to the peak to peak amplitude of an AC component of an input wave form. The circuit is for measuring narrow pulses that are spaced relatively widely apart. Capacitor C1 connects the transistor to receive only the AC component of the input wave form. The transistor has capacitor C2 in its emitter circuit that is charged to about the voltage at the base terminal. Then, when the input waveform falls, the transistor turns off and C2 discharges in circuit with parallel-connected resistor R4.

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Universal Peak Sensing Detection and Retention Device

This circuit produces at its output a signal that is proportional to the peak to peak amplitude of an AC component of an input wave form. The circuit is for measuring narrow pulses that are spaced relatively widely apart. Capacitor C1 connects the transistor to receive only the AC component of the input wave form. The transistor has capacitor C2 in its emitter circuit that is charged to about the voltage at the base terminal. Then, when the input waveform falls, the transistor turns off and C2 discharges in circuit with parallel-connected resistor R4.

The values of R4 and C2 are selected to provide a discharge rate to hold the value at the output for the desired time. Resistor R3 in the collector circuit is given a value appropriate to limit the charging current according to the characteristics of the transistor. The signal that appears across R3, when the transistor turns on, can be used for synchronizing apparatus connected to the circuit output.

Resistors R1 and R2 are given appropriate values to bias the transistor to conduct and have a quiescent voltage at its emitter terminal equal to ground. This causes the transistor to operate in its linear region. The rate of discharge is closely linear because C2 discharges over only the initial portion of the R-C discharge curve, an effect that is useful in measuring the time interval between pulses of known amplitude.

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