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LINEARITY CORRECTION CIRCUITRY

IP.com Disclosure Number: IPCOM000023844D
Original Publication Date: 1979-Feb-28
Included in the Prior Art Database: 2004-Apr-01
Document File: 2 page(s) / 251K

Publishing Venue

Xerox Disclosure Journal

Abstract

A simple, stable frequency and temperature-insensitive circuit is disclosed for correcting distortion in cathode ray tube (CRT) display systems. More specifically, the circuit comprises a ramp generator 10, a differential transistor pair 50, a current generator 40 and an output stage 50. Ramp generator 10 comprises transistor 14, resistors 16 and 18, capacitor 15, together with amplifier 12 to generate a linear ramp. The differential transistor pair 50

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XEROX DISCLOSURE JOURNAL

LINEARITY CORRECTION CIRCUITRY Carlo Infante

Lakkur Parthasarathy

Proposed Classification

U.S. Cl. 315/371

mt. CI. HOIj 29/56

r~H

Volume 4 Number 1 January/February 1979 75

k-so

[This page contains 1 picture or other non-text object]

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LINEARITY CORRECTION CIRCUITRY (Cont~d)

A simple, stable frequency and temperature-insensitive circuit is disclosed for correcting distortion in cathode ray tube (CRT) display systems.

More specifically, the circuit comprises a ramp generator 10, a differential transistor pair 50, a current generator 40 and an output stage 50. Ramp generator 10 comprises transistor 14, resistors 16 and 18, capacitor 15, together with amplifier 12 to generate a linear ramp. The differential transistor pair 50

comprises transistors 28 and 30 and associated biasing resistors, together with current generator 40, to transform the linear ramp from the ramp generator 10 into an S-shaping waveform, thereby generating the required correction. The S-shaping waveform is then added to the original linear ramp signal in the power output amplifier stage 60, thereby producing the required overall deflection waveform.

The power output amplifier stage 60 comprises amplifier 24, deflection coil 26 and resistors 41 and 42, Since the output current levels of the differential transistor pair are substantially 0 and 1 and since these levels are or can easily be made to be

temperature independent, temperature will not affect the size or...