Device and method for generating synchronous double-frequency signal

摘要

A synchronous double-frequency signal generating device includes an integration switching unit controlled by a scan synchronous signal; a first integration unit connected to the integration switching unit for outputting a first integration signal when the scan synchronous signal is at high level; a second integration unit connected to the integration switching unit for outputting a second integration signal when the scan synchronous signal is at low level; an addition unit connected to the first integration unit and the second integration unit for adding up the first integration signal and the second integration signal so as to output a double-frequency modulation signal; and a comparison unit connected to the addition unit for comparing the double-frequency modulation signal with a reference signal so as to output the synchronous double-frequency signal.