Patent ID: 6700433
Filing Date: 2004-03-02
Classification: H03K

Abstract:
An RF switch for selectively transferring an RF signal from an input node to an output node, the RF switch comprising:an NMOS transistor defining a gate that is biased to a reference voltage level, the NMOS defining a source and a drain of the NMOS transistor, wherein one of the source and the drain defines the input node and the other the output node, and wherein the RE signal is applied to the input node, and, wherein when the NMOS transistor is on, the RE signal is passed to the output node, and, when the NMOS transistor is off, the input node is isolated from the output node, a first bias supply and a lower voltage second bias supply, wherein the both bias supplies are lower than the reference voltage level, a first switch defining a first state and a second state, the switch arranged between and connecting input node to the first bias supply in the first state and connecting the input node to the second bias supply in the second state, wherein in the first state the NMOS transistor is off and in the second state the NMOS transistor is on.