Patent ID: 8729939

Claim:
A charging/discharging circuit, for charging/discharging a target element, comprising: a connection terminal, coupled to a target element, wherein the charging/discharging circuit provides an up current to the target element via the connection terminal and draws a down current from the target element via the connection terminal; a reference current providing module, for providing a reference current; an up current module, controlled by an up signal and providing said up current according to said reference current; and a down current module, controlled by a down signal and drawing said down current according to said reference current, comprising: a first switch module, having a first switch module control terminal for receiving said down signal; a first bias transistor, comprising: a first bias transistor first terminal, coupled to said connection terminal; a first bias transistor second terminal, coupled to said first switch module; and a first bias transistor control terminal, coupled to said reference current providing module; and a first capacitor simulation transistor, comprising: a first capacitor simulation transistor first terminal, coupled to said first switch module control terminal; a first capacitor simulation transistor second terminal, coupled to said first switch module control terminal; and a first capacitor simulation transistor control terminal, coupled to said first bias transistor control terminal.