Patent ID: 6859648
Filing Date: 2005-02-22
Classification: H04B

Abstract:
1. A semiconductor integrated circuit device comprising: a first phase shifter configured to make a phase difference of 90 degrees between local signals; first and second mixer circuits configured to mix the local signals made the phase difference with a received signal; a second phase shifter configured to make a phase difference of 90 degrees between output signals of the first and second mixer circuits to output first and second output signals made the phase difference; an adder configured to add the first and second output signals; a subtracter configured to subtract the first and second output signals; a signal intensity detector configured to compare between an intensity of an output signal of the subtracter with a reference level intensity; and a power supply control circuit configured to disable either of the first and second mixer circuits or either of the first and second mixer circuits and the first phase shifter according to a comparison result of the intensity of the output signal of the subtracter and the reference level intensity.