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US 2006/0132229 A1Published application
Phase demodulator and portable telephone apparatus
AssigneeKabushiki Kaisha Toshiba
InventorsTakashi Kawakubo, Toshihiko Nagano, Michihiko Nishigaki
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Abstract
A phase demodulator has a high frequency amplifier which amplifies a received signal modulated by phase, a voltage control oscillator which conducts oscillation operation in tune with the received signal amplified by the high frequency amplifier, a phase comparator which detects a phase difference between an output signal of the voltage control oscillator and a reference oscillation signal, and a demodulator which conducts demodulation process based on the phase difference.
Claims20
A phase demodulator comprising:
- a high frequency amplifier which amplifies a received signal modulated by phase;
- a voltage control oscillator which conducts oscillation operation in tune with the received signal amplified by the high frequency amplifier;
- a phase comparator which detects a phase difference between an output signal of the voltage control oscillator and a reference oscillation signal;
- and
- a demodulator which conducts demodulation process based on the phase difference.
2 more elements
A portable telephone apparatus, comprising:
- an antenna which sends and receives a radio signal modulated by phase;
- a receiver which conducts a reception process of a received signal received by the antenna;
- and
- a transmitter which conducts a transmission process of a transmission signal transmitted by the antenna,
- wherein the receiver includes:
- a high frequency amplifier which amplifies a received signal modulated by phase;
- a voltage control oscillator which conducts oscillation operation in tune with the received signal amplified by the high frequency amplifier;
- a phase comparator which detects a phase difference between an output signal of the voltage control oscillator and a reference oscillation signal;
- and
- a demodulator which conducts demodulation process based on the phase difference.
7 more elements
Dependencies are inferred from the claim text.