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    초록·키워드

    In this paper, a new speedup method of lock up time is proposed for the Phase Locked Loop (PLL) frequency synthesizer in the local oscillation circuit of a radio receiver. In the conventional speedup method, the time constant of Low Pass Filter (LPF) is switched to a smaller value. However, since the control voltage of Voltage Controlled Oscillator (VCO) varies at the switching point of the time constant, the synthesizer must be re-locked by the new constant. The proposed frequency synthesizer fully utilizes the advantage of the new (N+1/2) programmable divider which enables the half division ratio comparing with that of the conventional one. Therefore, the reference frequency can be doubled, which leads to a bigger loop gain K and the speedup of lock up time. The experimental results of lock up time will be given together with the spectrum of the output frequency.

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      UCI(KEPA) : I410-ECN-0101-2009-569-013235079