Anti-zero biasing clamp

Details Anti-zero biasing clamp Anti-zero biasing clamp

H - Electricity

04

N

350/109

H04N 5/68 (2006.01) H04N 5/14 (2006.01) H04N 5/21 (2006.01) H04N 5/59 (2006.01)

Patent

CA 1298401

RCA 84,915 ABSTRACT A diode clamp in a kine driver circuit clamps the voltage at the grid (G1) element of a picture tube to a level derived from the voltage at the cathode element of the picture tube. Deriving the grid (G1) voltage from the cathode voltage ensures that if the kine driver amplifier saturates, the voltage applied to the grid (G1) will always be less than that applied to the cathode. Thus, excessive beam current is prevented from flowing immediately following cold cathode turn-on, which excessive beam current would otherwise cause a phenomenon known as "focus flutter".

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