Clip circuit for video signal

Abstract

Abstract PURPOSE:To attain required setup level with no adjustment by applying feedback so as to eliminate a DC offset. CONSTITUTION:An emitter voltage of transistors (TRs) Q1, Q8 is fed to a voltage comparator circuit 4 and its comparison output Ec is fed to a capacitor C1 through a switch circuit 5. A level Eb of a signal Sa at a period Tb and a voltage E8 of the TR Q8 cause a difference voltage (Eb-E8) and it is held till the next period Th. Then the difference voltage (Eb-E8) is fed back to a base of the TR Q8 az a voltage E8 of the TR Q8 through a TR Q7 and a resistor R3. Thus, the required setup level is obtained with no adjustment.

Inventors

• 👤 Mitsuru Sato
• 👤 満 佐藤
• 👤 Tetsuya Iizuka
• 👤 哲也 飯塚
• 👤 Yoshihiro Furuya
• 👤 古屋　喜祥

Bibliographic Details