| 摘要 |
<P>PROBLEM TO BE SOLVED: To shorten a starting time of a high-pass filter circuit by enabling quick charge of the high-pass filter circuit. <P>SOLUTION: The sample and hold circuit comprises: a signal holding circuit 11 for holding an input signal for each predetermined timing; a high-pass filter circuit 12 for removing a low frequency component from a signal appearing on a first node N1 in an output side of a first transistor Q1 connected to the output side of the signal holding circuit 11; a quick charge circuit 14 for quickly charging a capacitor C2 of the high-pass filter circuit 12 by operating only when starting; an amplifying circuit 13 connected to the output side of the high-pass filter circuit 12; and a bias control circuit 15 for keeping a bias potential of the first node N1 at substantial constant before and after shifting to a normal operation from the end of the quick charging operation by the quick charge circuit 14. <P>COPYRIGHT: (C)2013,JPO&INPIT |
