TLTTransmission Line Transformer SPDT SPDT switch structure including Transmission Line TransformerTLT for single antenna operation

摘要

A wireless communication terminal using a single antenna includes a power amplifier circuit that is electrically connected to an output terminal of a transmitter in the terminal to amplify an output signal, a low-noise amplifier that is electrically connected to the input terminal of the receiver, An antenna for transmitting or amplifying the amplified output signal; a power amplifier circuit connected in parallel to the power amplifier circuit and the antenna between the power amplifier circuit and the antenna, A first impedance transformer circuit that performs impedance matching with a predetermined first impedance value in a circuit direction, a second impedance transformer circuit that is connected in parallel to the low noise amplifier circuit and the antenna between the low noise amplifier circuit and the antenna, Towards the amplifier circuit A first impedance circuit connected to the first impedance transformer circuit for turning on and off a signal transmission line of the first impedance transformer circuit, a second impedance transformer circuit for performing impedance matching with a second impedance value defined by the first impedance transformer circuit, And a second switching circuit connected to the second impedance transformer circuit for turning on and off a signal transmission line of the second impedance transformer circuit.