Radio frequency signal transmission circuit

Abstract

A radio frequency signal transmission circuit includes a direct current blocking unit, a biasing impedance circuit, and a radio frequency element. The direct current blocking unit has a first terminalfor receiving an input signal, and a second terminal coupled to a first bias voltage terminal. The biasing impedance circuit has a first terminal coupled to the first bias voltage terminal for providing a first bias voltage, and a second terminal coupled to a second bias voltage terminal for receiving a second bias voltage. The radio frequency element is coupled to the first bias voltage terminal, and receives and processes the input signal. When the biasing impedance circuit operates in a first mode, the biasing impedance circuit provides a first impedance. When the biasing impedance circuitoperates in a second mode, the biasing impedance circuit provides a second impedance greater than the first impedance.

Description

technical field [0001] The invention relates to a radio frequency signal transmission circuit, especially a radio frequency signal transmission circuit with high switching speed. Background technique [0002] In wireless communication, since the conditions of the operating environment may change anytime and anywhere, in order to ensure the quality of signal transmission, the transmission signal is often amplified by an amplifier to improve the quality of signal transmission and signal reception in wireless communication. Generally speaking, the amplifier will provide an appropriate bias operating environment through the bias circuit to ensure that the gain performance and linearity can meet the requirements. [0003] However, in the prior art, in order to save space, the RF signal transmitting end and the receiving end of the electronic device usually share the same antenna, and the electronic device switches between the transmitting end and the receiving end according to th...

AI Technical Summary

Problems solved by technology

However, usually during the switching operation, due to the capacitive effect of the components in the device, there will be charge accumulation, which will cause the bias voltage of the bias circuit to be pulled up after startup, causing the bias circuit to stabilize after a period of time. Provide the default bias voltage required by the system. Therefore, before the bias voltage provided by the bias voltage circuit reaches the preset required steady-state value, the linearity and gain of the RF components will be difficult to meet the requirements, resulting in distortion of the output signal

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