Vertical blanking circuit and bias clamp boost supply

摘要

A vertical blanking amplifier and bias clamp boost supply in accordance with the present invention uses the amplified vertical blanking signal to generate the boosted high voltage needed for powering the bias clamp circuits. A latch circuit is used to effectively lengthen the duration of the first vertical blanking pulse so as to ensure that the boosted power supply voltage is generated in the short time interval of one or two vertical scan intervals.