Patent ID: 8373493

Claim:
A power switching circuit, comprising: a first power-gating transistor connected between a circuit ground and a ground rail of an IC chip, wherein a gate of the first power-gating transistor receives a first control signal; a second power-gating transistor connected in parallel with the first power-gating transistor, wherein a gate of the second power-gating transistor receives a second control signal; and a third power-gating transistor connected in parallel with the first power-gating transistor and the second power-gating transistor, wherein a gate of the third power-gating transistor receives a third control signal, wherein the first power-gating transistor has a channel width to length ratio greater than that of the second power-gating transistor and the second power-gating transistor has a channel width to length ratio greater than that of the third power-gating transistor.