Patent ID: 7151679
Filing Date: 2006-12-19
Classification: H02M

Abstract:
1. A leading edge blanking circuit comprising: an input terminal for receiving a trigger signal indicating a time at which a blanking period should commence; switching means arranged to be activated by the trigger signal to change from a first state to a second state; comparison means having a first input terminal being connected to a reference source, a second input terminal arranged to receive a voltage which ramps over time in response to the trigger signal and an output terminal for providing an output signal of the leading edge blanking circuit which changes state subsequent to the voltage at the second terminal of the comparison means reaching the voltage level supplied by the reference source to the first terminal; and a charging circuit for providing the ramp voltage to the second input terminal of the comparison means, the circuit being characterised in that the time taken for the ramp voltage to reach the voltage level supplied by the reference source is deliberately adjusted as a function of a control signal received at a control input of the circuit.