Radio frequency circuit and communication device

Abstract

A radio frequency circuit includes: a plurality of input terminals including a first input terminal through which a first Wireless Local Area Network (WLAN) transmission signal is received and a second input terminal through which a 5th Generation New Radio (5G NR) transmission signal is received; a power amplifier; a first switch connected to an input side of the power amplifier and switches a connection of the power amplifier between the plurality of input terminals; and a variable phase circuit connected to an output side of the power amplifier and changes the impedance matching between the power amplifier and the load in accordance with a connection status of the first switch.

1 . A radio frequency circuit, comprising:
 a power amplifier;   an antenna switch configured to selectively connect a plurality of selection terminals to a common terminal, the power amplifier being connected to a first of the plurality of selection terminals; and   a variable phase circuit comprising a variable shunt capacitor and configured to set an output impedance of the power amplifier,   wherein the variable phase circuit is connected between a first node and ground, the first node being on a path between an output of the power amplifier and the antenna switch.   
     
     
         2 . The radio frequency circuit according to  claim 1 , wherein the variable shunt capacitor and the antenna switch are included in a same semiconductor component. 
     
     
         3 . The radio frequency circuit according to  claim 1 , wherein the variable phase circuit further comprises a third switch configured to selectively connect the variable phase circuit to power amplifier. 
     
     
         4 . The radio frequency circuit according to  claim 1 , further comprising:
 a first matching circuit connected between the power amplifier and the variable phase circuit.   
     
     
         5 . The radio frequency circuit according to  claim 4 , wherein the first matching circuit is directly connected to the variable phase circuit. 
     
     
         6 . The radio frequency circuit according to  claim 1 , further comprising:
 a second matching circuit connected between the variable phase circuit and an antenna connection terminal.   
     
     
         7 . The radio frequency circuit according to  claim 1 , further comprising:
 a plurality of input terminals including a first input terminal through which a first Wireless Local Area Network (WLAN) transmission signal is received and a second input terminal through which a 5th Generation New Radio (5G NR) transmission signal is received; and   a first switch connected to an input of the power amplifier, and configured to selectively connect the plurality of input terminals to the power amplifier.   
     
     
         8 . The radio frequency circuit according to  claim 1 ,
 wherein a frequency band of the first WLAN transmission signal is one of 5.15-5.35 GHz, 5.47-5.85 GHz, or 5.925-7.125 GHz, and   a frequency band of the 5GNR transmission signal is one of n46 ranging from 5.15 GHz to 5.925 GHz or n96 ranging from 5.925 GHz to 7.125 GHz.   
     
     
         9 . A communication device, comprising:
 a signal processing circuit configured to process a radio frequency signal; and   the radio frequency circuit according to  claim 1  configured to transfer the radio frequency signal between the signal processing circuit and an antenna.