Vertical compensation circuit utilizing variable gain amplifier

Details Vertical compensation circuit utilizing variable gain amplifier Vertical compensation circuit utilizing variable gain amplifier

1985-12-12

1987-02-24

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315403, H01J 2970, H01J 2972

Patent

active

046459871

ABSTRACT:
A vertical compensation circuit for a digital TV receiver having a vertical drive signal that is insensitive to changes in CRT beam current includes a variable gain amplifier and means for sensing changes in B+ operating potential that track changes in CRT high voltage which is related to CRT beam current. The voltage sensing means detects a change in B+ operating potential and applies a voltage indicative of that change to a feedback circuit for changing the feedback level on a variable gain amplifier to which the vertical drive signal is applied.

REFERENCES:
patent: 4031430 (1977-06-01), Enomoto
patent: 4243918 (1981-01-01), Meise

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