| 摘要 |
<p>A charge pump includes at least one switching transistor (Ms1,Ms2) for switching current on or off in response to an up or down signal, a pair of transistors (Md1,Md2,Md3,Md4) (one coupled to the source and the other to the drain of the switching transistor) each having its source and drain shorted and coupled to receive a complement of the signal on the gate terminal of the switching transistor on their gate terminals, and a fourth transistor (Mx,My) coupled to the drain of the switching transistor and a power supply (Gnd). The pair of transistors are activated concurrent with the deactivation of the switching transistor. The fourth transistor (Mx,My) may provide for active shutoff of a current transistor being switched by the switching transistor, by actively charging the source of the current transistor to a voltage which is not exceeded by the gate terminal of the current transistor. <IMAGE></p> |
