Transmitter, transceiver circuit, and wireless transmitting and receiving system

A transceiver circuit comprising:

• a transmitter;
• and
• a receiver, wherein
• the transmitter comprises:
• a phase control circuit configured to receive a first modulation signal from a first path for modulating a first frequency signal, and a second modulation signal from a second path for modulating a second frequency signal higher than the first frequency;
• and
• a power amplifier configured to receive a third modulation signal from a third path for controlling a gain, wherein
• the phase control circuit includes:
• a variable frequency divider, a frequency division ratio being controlled by the first modulation signal;
• a frequency modulation D/A converter configured to modulate the frequency by the second modulation signal;
• and
• a voltage controlled oscillator, including a varactor, configured to receive a first control voltage based on the first modulation signal and a second control voltage based on the second modulation signal, wherein
• at least one of a capacitance value of the varactor of the voltage controlled oscillator, a control bit number of the frequency modulation D/A converter, and a bias current value of the frequency modulation D/A converter is changed based on a data transfer rate.

A wireless transmitting and receiving system comprising:

• at least one node including a transceiver circuit;
• and
• at least one hub including the transceiver circuit, which includes a transmitter and a receiver, wherein
• the transmitter comprises:
• a phase control circuit configured to receive a first modulation signal from a first path for modulating a first frequency signal, and a second modulation signal from a second path for modulating a second frequency signal higher than the first frequency;
• and
• a power amplifier configured to receive a third modulation signal from a third path for controlling a gain, wherein
• the phase control circuit includes:
• a variable frequency divider, a frequency division ratio of the variable frequency divider being controlled by the first modulation signal;
• a frequency modulation D/A converter configured to modulate the frequency by the second modulation signal;
• and
• a voltage controlled oscillator, including a varactor, configured to receive a first control voltage based on the first modulation signal and a second control voltage based on the second modulation signal, wherein
• at least one of a capacitance value of the varactor of the voltage controlled oscillator, a control bit number of the frequency modulation D/A converter, and a bias current value of the frequency modulation D/A converter is changed based on a data transfer rate.