Radio frequency switch circuit

Abstract

The invention discloses a radio frequency switch circuit. The radio frequency switch circuit comprises a grid voltage control module for establishing the grid control voltage (VCG) for controlling on-off of a switch module, a body voltage control module for establishing the body control voltage (VCB) for controlling on-off the switch module and the switch module controlled by the grid control voltage (VCG) and the body control voltage (VCB) to connect or not connect a radio frequency input signal (RFin) to a radio frequency output end (RFout). The radio frequency switch circuit can optimize and reduce the on resistance (Ron) at a circuit layer and optimize the on-off time.

Description

technical field [0001] The invention relates to a circuit, in particular to a radio frequency switch circuit. Background technique [0002] figure 1 It is a schematic circuit diagram of a radio frequency switch circuit in the prior art. Such as figure 1 As shown, the radio frequency switch circuit in the prior art includes a switch module 10 and two common bias resistors, and the switch module 10 is composed of a plurality of cascaded NMOS transistors M1, M2, ..., MN, a plurality of body bias resistors R b , multiple gate bias resistors R g and a plurality of path resistors R, and common bias resistors Rx1 and Rx2 are connected between the switch module 10 and the gate control voltage VG and the body control voltage VB. [0003] The reduction of the on-resistance Ron of the switch module 10 is crucial to improving radio frequency characteristics such as insertion loss and harmonics of the radio frequency switch, and there is usually a certain gap between the on-resistanc...

AI Technical Summary

Problems solved by technology

When the switch is switched between off and on, it is actually a process of charging and discharging the gate and body capacitance of the control voltage through the bias resistor, so the time constant will become larger with the increase of the bias resistor, that is, the switch The switching time becomes longer, that is to say, there is a contradiction between insertion loss and switching time in the RF switching circuit of the prior art

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