Patent ID: 7064599
Filing Date: 2006-06-20
Classification: H03K

Abstract:
1. A transmission gate, comprising: a switch circuit including an input that is coupled to an input node, an output that is coupled to an output node, and a control input that is coupled to a control input node; a boost circuit that is arranged to provide a boost voltage at a boost node responsive to a supply voltage; a current source circuit that is coupled between the boost node and the control input node, wherein the current source circuit is arranged to provide a bias current during an on condition; and a constant voltage difference circuit that is coupled to the control input node, wherein the constant voltage difference circuit is arranged to provide a control input voltage at the control input node such that a voltage difference between the control input voltage and an input voltage at the input node is substantially constant during the on condition, wherein the constant voltage difference circuit includes a plurality of transistors, and wherein the constant voltage difference circuit is arranged such that the substantially constant voltage difference is substantially equal to the sum of the gate-to-source voltages of each of the plurality of transistors.