| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a hold circuit holding a peak voltage or a bottom voltage of input voltages varying with time. <P>SOLUTION: The hold circuit 10 includes an input terminal 20 inputting a voltage, an output terminal 22 outputting a held voltage, a reference voltage terminal 24 connecting to a ground voltage, an operational amplifier 30, a switch circuit 32, a capacitor 36, and an impedance converting circuit 38. In the switch circuit 32, one main electrode 34b and a gate electrode 34d are connected to a connection point 26, another main electrode 34a is equipped with an insulated gate type transistor 34 connected to an output terminal 30c of the operational amplifier 30, and a semiconductor well region of the insulated gate type transistor 34 is connected to the output terminal 22 through a bias electrode 34c. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
