Patent ID: 9548824
Date: 2017-01-17
CPC Classifications: H04B,H04W,Y02D

Claim:
1. A receiver circuit, comprising: a local signal generation circuit that generates a local signal; and a test signal generation circuit that generates a test signal having a frequency close to a frequency of the local signal, wherein the test signal generation circuit includes an oscillator that generates the test signal, a mixer that mixes the local signal with an output of the oscillator to generate a low-frequency signal which is a difference signal between the local signal and the output of the oscillator, a phase detector that detects a phase difference between the low-frequency signal output by the mixer and a reference signal, and a filter that extracts a low-frequency component from an output of the phase detector, and controls an oscillation frequency of the oscillator by using an output of the filter, wherein the local signal generation circuit performs feedback control in accordance with a phase comparison result between a local frequency-divided signal obtained by dividing the frequency of the local signal and an original reference signal, and wherein the reference signal is a signal obtained by dividing a frequency of the local frequency-divided signal further.