COUPLING-TYPE SINGLE-POLE DOUBLE-THROW SWITCH ADAPTED fOR RADIO FREQUENCY INTEGRATED CIRCUIT

Abstract

A coupling-type single-pole double-throw (SPDT) switch adapted for a radio frequency integrated circuit includes an input port, a first output port, a second output port, a multi-coupling-coil circuit and a transistor-based control circuit. The multi-coupling-coil circuit includes coils respectively connected with the input port, the first output port and the second output port. The transistor-based control circuit includes a first control circuit, a second control circuit and a third control circuit, and configured to control an input load of the multi-coupling-coil circuit using a control level of the first control circuit and realize connections between the input port and the first output port as well as the second output port using control levels of the second control circuit and the third control circuit. Therefore, the coupling-type SPDT switch can achieve a simple switching between two working states, and have low insertion loss and high isolation degree in both working states.

Dependencies are inferred from the claim text.