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Pulse Amplitude Detector

IP.com Disclosure Number: IPCOM000095659D
Original Publication Date: 1964-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Cooper, JE: AUTHOR [+2]

Abstract

This circuit detects on a go-no go basis if the amplitude of non-repetitive pulses of low nanosecond duration is greater or less than a predetermined level.

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Pulse Amplitude Detector

This circuit detects on a go-no go basis if the amplitude of non-repetitive pulses of low nanosecond duration is greater or less than a predetermined level.

The circuit has transistors T1 and T2, arranged in a current switching configuration to operate in the Class A mode. A tunnel diode timing circuit comprising the tunnel diode TD, the inductor L and the resistor R is included in the collector circuits of T1 and T2. Diodes D1 and D2 are also included in the collector circuits for establishing a voltage level at TD.

In normal operation, T1 and T2 are conducting and TD is biased at a predetermined level with respect to its peak current value by the supplies +V and -V. The level of biasing of TD, as well as its peak current value, establishes the predetermined level of pulse amplitude detection.

When a positive signal is applied to the base of T1, an increase of collector current occurs in this transistor. Similarly, if a negative signal is applied to the base of T2, a decrease of collector current occurs in this transistor and a corresponding increase occurs in the collector current of T1. The increase in collector current for T1 is added to the bias current for TD. When the sum of the change in collector current through T1, plus the bias current, exceeds the peak current of TD, it switches to its high voltage state producing a change in output at the collector of T1. The timing elements RL determine the duration of this output which can...