Semiconductor device and radio communication terminal mounting the same
AssigneeRenesas Mobile Corporation
InventorsTakayasu NORIMATSU, Satoru YAMAMOTO, Taizo YAMAWAKI
Life of this patent
Estimating the term…
Abstract
A phase detector, which forms a semiconductor device, detects a phase difference between a reference signal and a feedback signal obtained by feeding back an output signal of an oscillator, and generates a phase difference value indicating a value in accordance with the phase difference. An amplifier amplifies the phase difference value at a gain determined in accordance with a control signal from outside the device. A filter smoothes an output value of the amplifier. The oscillator controls a frequency of the output signal in accordance with an output value of the filter.
Claims7
A semiconductor device comprising:
- a phase detector that detects a phase difference between a feedback signal and a reference signal and generates a phase difference value indicating a value in accordance with the phase difference, the feedback signal being obtained by feeding back an output signal;
- an amplifier that amplifies the phase difference value at a gain determined in accordance with an external control signal;
- a filter that smoothes an output value of the amplifier;
- and
- an oscillator that controls a frequency of the output signal in accordance with an output value of the filter.
Dependencies are inferred from the claim text.