US 12,395,132 B2
Wireless communication circuit
Takeaki Watanabe, Yokohama (JP)
Assigned to SOCIONEXT INC., Kanagawa (JP)
Filed by Socionext Inc., Kanagawa (JP)
Filed on Jun. 6, 2023, as Appl. No. 18/330,019.
Application 18/330,019 is a continuation of application No. PCT/JP2021/005944, filed on Feb. 17, 2021.
Prior Publication US 2023/0327613 A1, Oct. 12, 2023
Int. Cl. H03F 3/00 (2006.01); H03F 1/56 (2006.01); H03F 3/19 (2006.01)
CPC H03F 1/565 (2013.01) [H03F 3/19 (2013.01); H03F 2200/294 (2013.01); H03F 2200/451 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A wireless communication circuit, comprising:
an antenna;
a transmitter circuit having an output amplifier outputting a transmission signal to the antenna;
a receiver circuit having a low noise amplifier (LNA) into which a reception signal from the antenna is input; and
a matching circuit provided between the antenna and an input of the LNA,
wherein
the LNA has a MOS input transistor receiving at its gate the reception signal from the antenna via the matching circuit, and
the LNA includes a variable capacitance provided between the gate and a source of the input transistor, a capacitance value of the variable capacitance being changed between a transmission time during which the transmission signal is output and a reception time during which the reception signal is received.