Semiconductor integrated circuit and radio communication...

Details Semiconductor integrated circuit and radio communication... Semiconductor integrated circuit and radio communication...

2011-04-19

2011-04-19

Bocure, Tesfaldet (Department: 2611)

Pulse or digital communications

Transceivers

C375S326000, C375S355000

Reexamination Certificate

active

07929594

ABSTRACT:
A total power consumption of a radio communication apparatus is reduced, the radio communication apparatus including a semiconductor integrated circuit (high-frequency IC) which has a clock generation circuit which generates a reference clock signal for use in modulating a transmit signal and demodulating a received signal. The clock generation circuit is provided with a voltage-controlled oscillator circuit (VCXO) which oscillates, when a quartz oscillator is connected thereto, at a frequency dependent on a natural frequency of the quartz oscillator and a control voltage applied thereto. The voltage-controlled oscillator circuit is configured such that a result obtained by converting, in an internal D/A converter circuit, digital frequency control information supplied from the baseband circuit is applied as the control voltage to the voltage-controlled oscillator circuit and such that the voltage-controlled oscillator circuit oscillates at a frequency corresponding to the control voltage.

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