Patent ID: 9571068
Date: 2017-02-14
CPC Classifications: H03K

Claim:
1. A power gating circuit, comprising: a first switch, a first terminal of the first switch is coupled with a first voltage source; a power gating switch, a control terminal of the power gating switch is coupled with a second terminal of the first switch, a first terminal of the power gating switch is coupled with a second voltage source, a second terminal of the power gating switch is used to couple to a power terminal of a function circuit; a pre-charging circuit, an input terminal of the pre-charging circuit receives an input signal, an output terminal of the pre-charging circuit is coupled with the control terminal of the power gating switch, wherein the input signal defines a powered period of the function circuit, the pre-charging circuit is used to perform pre-charging on the control terminal of the power gating switch during a first sub-period of the powered period; and a control circuit, an input terminal of the control circuit receives the input signal, an output terminal of the control circuit is coupled with a control terminal of the first switch, wherein the control circuit controls the first switch such that the first voltage source performs charging on the control terminal of the power gating switch during a second sub-period of the powered period, wherein the pre-charging circuit further outputs a control signal to a control terminal of the control circuit, such that the first switch remains off before the pre-charging circuit performs the pre-charging on the control terminal of the power gating switch.