Wireless communication apparatus

1. A wireless communication apparatus comprising:

a local oscillator which generates a local clock;

a transmitter which sends transmitted data wirelessly while mixing it with the local clock;

a first frequency divider which generates a first divided clock resulting from the local clock being divided;

a spreading waveform generator which generates a spread clock resulting from the first divided clock being spread in the PN pattern;

a wired sender which, by sending the spread clock by wire, causes both the transmitter and the receiver to share it;

a voltage controlled oscillator which generates a multiplied clock based on a control voltage;

a receiver which receives the transmitted data sent from the transmitter while mixing it with the multiplied clock;

a second frequency divider which generates a second divided clock resulting from the multiplied clock being divided;

a phase comparator which detects a phase difference between the spread clock sent by the wired sender and the second divided clock; and

a charge pump circuit which transmits a control voltage corresponding to the phase difference detected by the phase comparator,

wherein the spreading waveform generator includes;

an edge detector which detects an edge of the PN pattern;

an exclusive OR circuit which carries out an exclusive OR operation of the first divided clock and the spread clock; and

a switch which, based on a result of the detection of the edge of the PN pattern, switches between a doubled clock resulting from the first divided clock being doubled and an output from the exclusive OR circuit.

2. A wireless communication apparatus comprising:

a local oscillator which generates a local clock;

a transmitter which sends transmitted data wirelessly while mixing it with the local clock;

a first frequency divider which generates a first divided clock resulting from the local clock being divided;

a spreading waveform generator which generates a spread clock resulting from the first divided clock being spread in the PN pattern;

a wired sender which, by sending the spread clock by wire, causes both the transmitter and the receiver to share it;

a voltage controlled oscillator which generates a multiplied clock based on a control voltage;

a receiver which receives the transmitted data sent from the transmitter while mixing it with the multiplied clock;

a second frequency divider which generates a second divided clock resulting from the multiplied clock being divided;

a phase comparator which detects a phase difference between the spread clock sent by the wired sender and the second divided clock; and

a charge pump circuit which transmits a control voltage corresponding to the phase difference detected by the phase comparator,

wherein the phase comparator includes:

a first flip flop which, after the second divided clock decays, by applying a reset at a timing of a change in level of the second divided clock sampled in the spread clock, transmits an up signal, which corresponds to a phase lag of the second divided clock with respect to the spread clock, to the charge pump circuit; and

a second flip flop which, after the second divided clock rises, by applying a reset based on a level of the second divided clock sampled in the spread clock, transmits a down signal, which corresponds to a phase advance of the second divided clock with respect to the spread clock, to the charge pump circuit.

3. A wireless communication apparatus comprising:

a transmitter which sends transmitted data while mixing it with a carrier;

a receiver which receives the transmitted data sent from the transmitter while mixing it with the carrier;

a spreading waveform generator which generates a spread clock resulting from a reference clock for generating the carrier being spread in a PN pattern;

a wired sender which, by sending the spread clock by wire, causes both the transmitter and the receiver to share it; and

a carrier reproducer which reproduces the carrier based on a result of a phase comparison with the spread clock,

wherein the spreading waveform generator changes a clock duty ratio in such a way that a high level section between symbol changing points of the PN pattern occupies 50% or more.

4. A wireless communication apparatus comprising:

a first casing portion;

a second casing portion connected to the first casing portion;

a connector which connects the first casing portion and the second casing portion in such a way that a positional relationship between the first casing portion and the second casing portion can be changed;

an external wireless communication unit which, being mounted on the first casing portion, carries out an external wireless communication;

a display which is mounted on the second casing portion;

a transmitter which, being mounted on the first casing portion, sends transmitted data wirelessly while mixing it with a carrier;

a receiver which, being mounted on the second casing portion, receives the transmitted data transmitted from the transmitter while mixing it with the carrier;

a spreading waveform generator which, being mounted on the first casing portion or the second casing portion, generates a spread clock resulting from a clock for generating the carrier being spread in a PN pattern;

a wired sender which, being mounted on the first casing portion or the second casing portion, by sending the spread clock by wire, causes both the transmitter and the receiver to share it; and

a carrier reproducer which, being mounted on the second casing portion, reproduces the carrier based on a result of a phase comparison with the spread clock,

wherein the spreading waveform generator, by changing a position of a trailing edge of the PN pattern, while changing a clock duty ratio in such a way as to prevent two or more clocks for generating the carrier from existing in a section ranging from a trailing edge to a next leading edge of the PN pattern, generates the spread clock resulting from the clocks being spread in the PN pattern.