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# Pulse and Restore Circuit

IP.com Disclosure Number: IPCOM000092920D
Original Publication Date: 1967-Mar-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 30K

IBM

Stein, A: AUTHOR

## Abstract

Two closely spaced sequential pulses can be produced by triggering transistors T2 and T3 with opposite polarity portions of the output of ringing inductor L1. When a pulse is applied to input A, it is differentiated by capacitor C1 and resistor R1 to produce a negative and positive signal at the base of transistor T1. The negative signal turns T1 off. This starts the tank circuit comprised of L1 and capacitor C2 ringing, thus tending to produce a sinusoidal output at the collector of T1. The positive portion of this sinusoidal output causes T2 to conduct to produce the first of the two sequential pulses at the collector of T2. The negative portion of the sinusoidal output is clamped by T3 to produce the second of the two pulses at the collector of T3.

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Pulse and Restore Circuit

Two closely spaced sequential pulses can be produced by triggering transistors T2 and T3 with opposite polarity portions of the output of ringing inductor L1. When a pulse is applied to input A, it is differentiated by capacitor C1 and resistor R1 to produce a negative and positive signal at the base of transistor T1. The negative signal turns T1 off. This starts the tank circuit comprised of L1 and capacitor C2 ringing, thus tending to produce a sinusoidal output at the collector of T1. The positive portion of this sinusoidal output causes T2 to conduct to produce the first of the two sequential pulses at the collector of T2. The negative portion of the sinusoidal output is clamped by T3 to produce the second of the two pulses at the collector of T3.

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