Patent ID: 8476939
Filing Date: 2013-07-02
Classification: H03K

Abstract:
1. An apparatus comprising: a switch driver circuit, the switch driver circuit comprising: an input to receive a control signal; an output to control a state of a switch in accordance with the control signal; a set of parallel switches in the switch driver circuit including a P-type field effect transistor in parallel with an N-type field effect transistor, the set of parallel switches controlled based on the control signal to selectively and electrically couple a voltage source signal to the output to control the state of the switch; a first common node, the first common node connecting a source terminal of the P-type field effect transistor and a drain terminal of the N-type field effect transistor; a second common node, the second common node connecting a drain terminal of the P-type field effect transistor and a source terminal of the N-type field effect transistor; and a capacitor that electrically couples a node of the switch to the first common node; wherein the node of the switch is a source node; wherein the switch is a control switch in a switching power supply; wherein the source node of the switch is electrically coupled to each of: i) a drain node of a synchronous switch in the switching power supply, and ii) a node of an inductive element in the switching power supply; and wherein the capacitor provides capacitive coupling between the node of the switch and the first common node.