| 摘要 |
A phase locking oscillator (60, 70, 80, 90, or 110) and a radio frequency oscillator (62, 72, 82, 92, or 112) achieve reduced incidental frequency modulation. A frequency-deviation sensitivity is reduced by a divider (66 or 100) that reduces a frequency-control voltage, thereby decreasing voltage spikes and other electrical noise, and thereby reducing incidental frequency modulation. In embodiments having an AC voltage divider (66), the frequency-control voltage is reduced when a frequency thereof is above a predetermined roll-off frequency. Below the roll-off frequency, the voltage dividing function ceases, and full deviation sensitivity of the radio frequency oscillator (62, 72, or 82) is restored, whereby a capture range of the phase locking oscillator (60, 70, or 80) and a maximum frequency range of the radio frequency oscillator (62, 72, or 82) are restored. Some of the phase locking oscillators (70, 80, 90, or 110) and some embodiments of the radio frequency oscillators (72, 82, 92, or 112) include means (66 or 100) for proportionally combining a supplementary voltage with the reduced frequency-control voltage. Proportionally combining is used in some of the phase locking oscillators (70 or 80) to increase a speed of phase locking. In other embodiments of the phase locking oscillator (90 or 110), proportional combining is used to maintain the capture range. In the phase locking oscillator (90), proportional combining is used to maintain the capture range and to increase the speed of phase locking.
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