Patent ID: 7760009
Filing Date: 2010-07-20
Classification: H03K

Abstract:
1. A circuit comprising: a first power supply node at a first power supply voltage; a gated-node; a first control device coupled between the first power supply node and the gated-node, wherein the first control device is configured to pass the first power supply voltage to the gate-node or to disconnect the gated-node from the first power supply voltage; a second control device coupled between the first power supply node and the gated-node, wherein the second control device is configured to pass a gated-voltage to the gated-node or to disconnect the gated-node from the gated-voltage; a voltage-drop device comprising at least a diode coupled between the first power supply node and the gated-node, wherein the voltage-drop device is serially connected with the second control device; and a negative-feedback current source connected in parallel with the voltage-drop device, wherein the negative-feedback current source is configured to provide a current tracking a variation of the gated-voltage at the gated-node.