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    • 2. 发明专利
      JP5333439B2 Oscillation frequency control method of the frequency synthesizer and the oscillator 有权
    • Oscillation frequency control method of the frequency synthesizer and the oscillator
    • JP5333439B2
    • 2013-11-06
    • JP2010505488
    • 2009-03-03
    • 日本電気株式会社
    • 正 前多
    • H03L7/091 , H03K5/14 , H03K5/26 , H03L7/06 , H03L7/087
    • H03L7/085 , H03L7/1806
    • Frequency control with a high accuracy is carried out by means of a high-speed PLL circuit driven at low voltage. A frequency control word (FCW) represents a target multiplier of a reference signal (FREF) with respect to an oscillator output (CVK). A phase detector (51) accumulates the frequency control word (FCW) at the timing of the reference signal (FREF) to detect the phase fR01 of the reference signal (FREF). A phase detector (52) accumulates the number of clocks of the oscillator output (CVK) at the timing of the reference signal (FREF) to detect the phase fV01 of the oscillator output (CVK). A phase detector (53) accumulates the number of clocks of the oscillator output (CVK) at the timing fR1 of the reference signal (FREF) which is delayed by a delay element (61) to detect the phase fV02 of the oscillator output (CVK). A phase detector (57) accumulates the number of clocks of the oscillator output (CVK) at the timing fR2 of the reference signal (FREF) which is delayed by the delay element (61) and a delay element (62) to detect the phase fV00 of the oscillator output (CVK). The sum of the phase fV00 and the phase fV01 and the difference between them are calculated. The results are divided by a divider (86) to calculate the number of clocks f0 of the oscillator output (CVK) for the time delayed by one delay element. The sum of the phase fR01 and the phase fV01 and the difference between them are calculated to obtain a first phase error signal. The sum of the phase fR01, the phase f0, and the phase fV02 and the difference between the sum of the phase fR01 and the phase f0 and the phase fV02 are calculated to obtain a second phase error signal. The first and second phase error signals are combined into a composite signal, and the frequency of the oscillator is controlled by the composite signal.
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