Patent ID: 7831219
Filing Date: 2010-11-09
Classification: H03H

Abstract:
1. A matching network for matching an antenna to a transmitter or receiver, comprising: an input port for receiving high-frequency power; an output port; a switchable impedance transformation circuit connected between the input port and the output port, wherein the impedance transformation circuit comprises a CMOS switch in a high-frequency path having a first switching state and a second switching state, wherein the impedance transformation circuit is implemented to match a first impedance applied to the output port to a first predetermined impedance in the first switching state, and to match a second impedance applied to the output port to a second predetermined impedance in the second switching state, wherein the CMOS switch comprises a parallel circuit consisting of an n-channel MOS field effect transistor and a p-channel MOS field effect transistor, wherein a source terminal of the n-channel MOS field effect transistor is coupled to a drain terminal of the p-channel MOS field effect transistor to form a first terminal of the CMOS switch, wherein a drain terminal of the n-channel MOS field effect transistor is coupled to a source terminal of the p channel MOS field effect transistor to form a second terminal of the CMOS switch, wherein the n-channel MOS field effect transistor comprises a gate terminal for a first control signal, and wherein the p-channel MOS field effect transistor comprises a gate terminal for a second control signal complementary to the first control signal.