<p>Methods, circuits, and systems for determining the presence of a chopped input signal are disclosed. A digital signal generator can produce multiple digital signals when an alternating current (AC) signal input reaches multiple threshold voltages. The times at which the threshold voltages are reached can be determined by looking at the times at which the digital signals go high and low. The differences between the times at which the digital signals go high and low are used to determine if the AC signal input is a leading or trailing edge chopped signal. The AC input signal is a leading edge chopped signal when the difference between the times at which the digital signals go high is less than a predetermined time threshold, and is a trailing edge chopped signal when the difference between the times at which the digital signals go low is less than a predetermined time threshold.</p>
申请公布号
WO2012112750(A1)
申请公布日期
2012.08.23
申请号
WO2012US25395
申请日期
2012.02.16
申请人
MARVELL WORLD TRADE LTD.;CHOI, JINHO;PENG, HAO;ZHANG, WANFENG;DOAN, TUYEN