Semiconductor integrated circuit device

Details Semiconductor integrated circuit device Semiconductor integrated circuit device

2005-02-22

2005-02-22

Vo, Nguyen (Department: 2685)

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

C455S343100

Reexamination Certificate

active

06859648

ABSTRACT:
A semiconductor integrated circuit device includes 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 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, 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.

REFERENCES:
patent: 6282413 (2001-08-01), Baltus
patent: 1282279 (2003-05-01), None
patent: 8-130416 (1996-05-01), None

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