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US 2003/0194983 A1Published application
Semiconductor integrated circuit device
AssigneeKabushiki Kaisha Toshiba
InventorsMototsugu Hamada, Hiroki Ishikuro
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AssigneeKabushiki Kaisha Toshiba
InventorsMototsugu Hamada, Hiroki Ishikuro
Estimating the term…
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.
A semiconductor integrated circuit device comprising:
Dependencies are inferred from the claim text.
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This application is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 2002-108081, filed Apr. 10, 2002, the entire contents of which are incorporated herein by reference.
1. Field of the Invention
The present invention relates to a semiconductor integrated circuit device having a mixer built in.
FIG. 1 is a schematic diagram of a semiconductor integrated circuit device according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of other semiconductor integrated circuit device according to the first embodiment of the present invention;
FIG. 3 is a schematic diagram of a semiconductor integrated circuit device according to a second embodiment of the present invention;
The preferred embodiments of the present invention will be described with reference to the drawings. Like components are shown by corresponding reference numerals throughout several views of the drawings.
[First Embodiment]
The first embodiment is adapted to detect the intensity of an image signal and disable part of circuits that constitute a frequency converter according to the detected intensity of the image signal.