Browse Prior Art Database

Unipolar/Bipolar Pulse Generator and Amplifier

IP.com Disclosure Number: IPCOM000075155D
Original Publication Date: 1971-Aug-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Av-Ron, M: AUTHOR [+2]

Abstract

The unit consists of a 1.0 Mhz crystal controlled oscillator 4 with a square-wave output triggering two separate single shots, acting as positive and negative pulse generators. The two signals are applied to a PNP-NPN driver and power amplifier stage 5 designed in a complementary configuration, driving a common 50 Omega load.

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Unipolar/Bipolar Pulse Generator and Amplifier

The unit consists of a 1.0 Mhz crystal controlled oscillator 4 with a square- wave output triggering two separate single shots, acting as positive and negative pulse generators. The two signals are applied to a PNP-NPN driver and power amplifier stage 5 designed in a complementary configuration, driving a common 50 Omega load.

The width of the positive pulse is controlled by single-shot circuit (SS) 1. Similarly, the width of the negative pulse is controlled by SS 3. The negative branch contains an additional single shot, SS 2, which controls the position of the negative portion of the signal with respect to that of the positive.

The objective of the NPN-PNP driver and power amplifier stage 5 is to give rise to a bipolar current pulse through the load under generation (50 Omega). However, the positive and negative portions are totally independent of each other. This independence applies to the width, relative position, and relative magnitude of each portion of the output pulse. Principle of Operation of PNP- NPN Driver & Power Amplifier.

With no signal applied to the base of T1, V(IN)(1) as well as V(IN)(3) approaches zero, driving the respective transistors toward cutoff. Under this condition, no currents except leakage flow through V(cc)(1). Upon application of a positive signal to the base of T1, T1 and consequently, T2 are switched into saturation with the latter giving rise to the positive portion of the bipolar...