Charge pump circuit and PLL circuit using the same,申请号EP20100008303-传众专利搜索

Charge pump circuit and PLL circuit using the same

申请公布号：EP2290821(A1)

申请号：EP20100008303

申请日期：2010.08.09

申请公布日期：2011.03.02

申请人：

ICOM INCORPORATED

发明人：YAMAGUCHI, KOUICHIRO

分类号：H03L7/089

主分类号：H03L7/089

摘要：<p>A charge pump circuit 31, and a PLL circuit using the charge pump circuit, according to the present invention, comprises a glitch compensation circuit 36 to compensate for a slow glitch which occurs along charging/discharging of electric charges in a parasitic capacitance. The glitch compensation circuit 36 includes a comparator 37, a latch circuit 38, a capacitor C1 and transistors Q9, Q10 serving as a charge/discharge device. The comparator 37 is operable to compare between given potentials and apply a logic output signal to the latch circuit 38, and the latch circuit 38 is operable, in response to an output of the comparator at a given timing, to instruct the charge/discharge device to perform a charge or discharge operation to charge or discharge the capacitor so as to allow a potential at a second output terminal to come close to a potential at a first output terminal or a potential at a designated node in a loop filter of the PLL circuit.</p>