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Peak Voltage Detector

IP.com Disclosure Number: IPCOM000096694D
Original Publication Date: 1963-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Yang, ES: AUTHOR [+2]

Abstract

This detector or stretcher measures the amplitude of a pulse duration of the order of 40 nanoseconds. The circuit effects accurate amplitude measurement regardless of the shift in input voltage level.

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Peak Voltage Detector

This detector or stretcher measures the amplitude of a pulse duration of the order of 40 nanoseconds. The circuit effects accurate amplitude measurement regardless of the shift in input voltage level.

Two different arrangements are available as pulse input circuitry. One has a differential amplifier including transistors T1 and T2. These connect to a constant current source comprising transistor T3 and a resistor connected to a voltage supply. An input signal is supplied to T1 which is normally non conducting. A reference voltage is provided to the T2 base which is slightly conducting. An input signal of suitable polarity renders T1 conducting and partially turns off T2. An output signal appearing at the T1 collector is capacitively coupled to inverter T4. This provides an input to T5 arranged to charge capacitor C included in its emitter circuit. Capacitor C is connected across T6 as an input which provides emitter follower operation and returns a feedback or reference signal to T2. As soon as the feedback signal at the T2 base is equal to the input signal, T1 is cut off. When T1 is cut off, the charge on C is equal to the amplitude of the input pulse. T6 at this time acts as a diode preventing C from discharging. Large resistor R in the T6 emitter delays the discharge of C. The voltage on the feedback line and appearing at the output terminal is substantially equal to the amplitude of the input pulse, it is maintained for a relatively long...