Patent attributes
The present invention is a wide dynamic range antenna switch that, when disabled, has a stable input impedance over a wide power range. The wide dynamic range antenna switch includes multiple transistors, which are coupled in series, to provide a main signal path between an antenna connection and a radio connection. Direct current (DC) bias signals are provided to each of the transistors to ensure than when the antenna switch is disabled, the input impedance is stable. A control input, which may operate with low voltage control signals, enables or disables the antenna switch. The antenna switch may be coupled with other antenna switches in a communications system with multiple transceivers sharing a common antenna, and with a wide range of transmitter output power levels. Different embodiments of the present invention provide different DC bias circuit architectures.
