Apple Inc.
Transmit-receive switch

Abstract:

A transmit-receive (T/R) switch is disclosed. An apparatus including a T/R switch includes a transceiver to transmit signals to an antenna and to receive signals from the antenna. The signals are conveyed to and from the transceiver by a T/R switch. The T/R switch includes a transmit path and a receive path. The receive path includes a three-port inductor having a first terminal coupled to an input/output (I/O) terminal of the T/R switch and a second terminal coupled to a first pass transistor, and a third terminal. A pull-down transistor is coupled between the third terminal and a ground node. When active, the pull-down transistor pulls the receive path down toward ground.