| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain a charge pump circuit with a dead zone reduced which operates at high speed by preventing variation in the gate potential of a current source Tr (transistor) and making the rise time of output current small even when an up signal and a down signal input to the charge pump circuit have short pulses. <P>SOLUTION: Connection destinations of source terminals are switched so as to make the amount of an increase in a potential at one source terminal and the amount of a decrease in a potential at the other source terminal almost equal between a charging current source Tr and a charging dummy Tr which have almost equal capacity between respective gate and source, while being biased to respective gate terminals in common, drain terminals of the charging current source Tr and a discharging current source Tr are connected to each other to be an output terminal, the discharging current source Tr and a discharging dummy Tr form a discharging circuit in a manner similar to a charging circuit, and connection destinations of source terminals are switched so as to make the amount of an increase in a potential at one source terminal and the amount of a decrease in a potential at the other source terminal almost equal. <P>COPYRIGHT: (C)2007,JPO&INPIT |
