Patent ID: 8618884

Claim:
A high-frequency signal processing device comprising: a first amplifier circuit which operates in a saturation region where output power is higher than at a 1 dB gain compression point, receives a first input signal, which is phase-modulated or frequency-modulated, and amplifies power by using a first inductor as a load; a second amplifier circuit which operates in a linear region where output power is lower than at the 1 dB gain compression point, receives a second input signal, which is output from the first amplifier circuit, and amplifies power by using a second inductor as a load, the second inductor having a higher Q-value than the first inductor; an LC resonant oscillator circuit, wherein the first input signal is generated when an LC component of the LC resonant oscillator circuit is modulated in accordance with transmission data; a mixer circuit that downconverts a third input signal by using a local oscillation signal; and a buffer circuit that is disposed downstream of the LC resonant oscillator circuit, wherein the LC resonant oscillator circuit outputs the first input signal to the first amplifier circuit through the buffer circuit at the time of transmission, and outputs the local oscillation signal to the mixer circuit through the buffer circuit at the time of reception.