Patent ID: 7551015
Filing Date: 2009-06-23
Classification: G06F,G09G

Abstract:
1. An operating frequency generating circuit for a switching voltage converter, comprising: a delay circuit, for receiving a reference clock signal and a digital period signal, and delaying a phase of the digital period signal according to the reference clock signal, so as to generate at least one delay period signal, wherein the delay circuit comprises: a first flip-flop, having an input end and a clock input end respectively to receive the digital period signal and the reference clock signal, so as to output a first delay period signal, wherein a rising edge of the first delay period signal is synchronous with a first edge of the reference clock signal; and a select circuit, for receiving the digital period signal and the delay period signals, and selecting the digital period signal or one of the delay period signals for outputting as an output clock signal, so as to serve as the operating frequency of the switching voltage converter, such that the phase of the output clock signal is changed according to the select circuit.