发明名称 FREQUENCY SYNTHESIZER OF MOBILE COMMUNICATION TERMINAL
摘要 PURPOSE: A frequency synthesizer of a mobile communication terminal is provided to additionally install a fixing power unit for supplying a fixing power to a PLL(Phase Locked Loop), to reduce system synchronization time of the PLL and a VCO(Voltage Control Oscillator) while waking up, so as to decrease system stabilization time. CONSTITUTION: A TCXO(Temperature Compensated Crystal Oscillator)(100) generates a reference frequency. A PLL(102) detects phases of the reference frequency and an output frequency of a VCO(112), and outputs a phase difference. An LPF(Low Pass Filter)(110) converts the phase difference into a DC level signal to output the DC level signal. The VCO(112) oscillates an output frequency whose phase difference is compensated, according to the DC level signal, and applies the oscillated frequency to the PLL(102). A fixing power unit(300) supplies a predetermined fixing power to the PLL(102) during wake-up of a frequency synthesizer. A CPU(116) applies data to the PLL(102), and applies an operation power to the VCO(112) during the wake-up of the frequency synthesizer.
申请公布号 KR20020021904(A) 申请公布日期 2002.03.23
申请号 KR20000054637 申请日期 2000.09.18
申请人 SAMSUNG ELECTRONICS CO., LTD. 发明人 KIM, HONG GYU;SHIN, DU SIK
分类号 H04B1/40;(IPC1-7):H04B1/40 主分类号 H04B1/40
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