Patent ID: 7432671
Filing Date: 2008-10-07
Classification: G09G,H04N

Abstract:
1. A circuit for cathode ray tube blanking, comprising: a first impedance circuit that is coupled to a first node; a voltage divider circuit that includes a second impedance circuit and a third impedance circuit, wherein the second and third impedance circuits are coupled together at a voltage divider output node; and a switch circuit that is coupled between the first node and the voltage divider output node, wherein the switch circuit is arranged to open and close based on an input voltage and a first bias voltage such that the first bias voltage acts as a logic threshold of the switch circuit, the switch circuit is closed if the input voltage corresponds to a logic high relative to the logic threshold, and such that the switch circuit is open if the input voltage corresponds to a logic low relative to the logic threshold; and wherein the switch circuit is further arranged to, at least if the switch circuit is closed, provide a second bias voltage to the first node such that the second bias voltage is based, in part, on the first bias voltage.