Patent ID: 8942621
Filing Date: 2015-01-27
Classification: H04L

Abstract:
1. A phase adjustment circuit comprising: a first amplifier configured to receive one of a first I local signal and a first Q local signal having a frequency identical to that of the first I local signal and a phase different from that of the first I local signal, the first amplifier having a first gain to provide a desired phase difference between the first I local signal and the first Q local signal; a first adding and subtracting unit for configured to change between adding and subtracting the other of the first I local signal and the first Q local signal to or from an output signal from the first amplifier, and to output a second Q local signal when said one of the first I local signal and the first Q local signal is the first I local signal, and to output a second I local signal when said one of the first I local signal and the first Q local signal is the first Q local signal; a second amplifier configured to receive the other of the first I local signal and the first Q local signal, the second amplifier having a second gain to provide the desired phase difference between the first I local signal and the first Q local signal; and a second adding and subtracting unit configured to change between adding and subtracting said one of the first I local signal and the first Q local signal to or from an output signal from the second amplifier, and to output a second I local signal when said one of the first I local signal and the first Q local signal is the first I local signal, and to output a second Q local signal when said one of the first I local signal and the first Q local signal is the first Q local signal, wherein the second I local signal and the second Q local signal is input to a quadrature mixer.