Browse Prior Art Database

Differential Pulser

IP.com Disclosure Number: IPCOM000080714D
Original Publication Date: 1974-Feb-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Barsotti, RH: AUTHOR [+2]

Abstract

In response to a positive-going transition in either input signal +D or -D, the illustrated circuit supplies complementary or differential output + and - pulses in a precise phase time relationship. With +D negative, an initial circuit operational state includes T2 and T7 conducting; while T1, T4, T5, and T6 are nonconductive. T3 and T8 are level converters. Capacitor C1 is charged such That signal B is more positive than signal A.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 99% of the total text.

Page 1 of 2

Differential Pulser

In response to a positive-going transition in either input signal +D or -D, the illustrated circuit supplies complementary or differential output + and - pulses in a precise phase time relationship. With +D negative, an initial circuit operational state includes T2 and T7 conducting; while T1, T4, T5, and T6 are nonconductive. T3 and T8 are level converters. Capacitor C1 is charged such That signal B is more positive than signal A.

A positive transition on +D terminal causes signal A to go rapidly positive. Capacitor C1 transfers this rise in voltage to the base of T2, causing voltage signal B to rise rapidly. This transfer causes transistor T8 to become nonconducting and keeps transistor T2 conducting, until capacitor C1 changes its charge. The rise in +D also causes transistor T6 to become conductive, while transistor T7 becomes nonconductive. This action causes IRC2 to rise, while IRC1 falls to zero.

Capacitor C1 discharges at a rate determined by the current through transistor T13. When this discharge brings signal B more negative than signal A, current switch transistor pair T1 and T2 switch states; T1 becomes conductive while T2 becomes nonconductive. Then, T4 conducts and T6 becomes nonconductive; IRC2 goes to zero, while IRC1 increases. C1 continues discharging until signal B becomes sufficiently negative for T8 to become conductive.

An opposite action occurs when -D goes positive.

1

Page 2 of 2

2

[This page contains 3 pictures or othe...