Frequency locking method, voltage-controlled oscillator and frequency generating unit
A voltage-controlled oscillator and control unit technology, applied in the field of communication, can solve the problems affecting the data transmission rate, long frequency locking time, slow frequency conversion speed, etc., and achieve the effect of reducing the difference, short locking time, and fast speed
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[0063] see figure 1 , the frequency locking process is divided into three stages:
[0064] T1: Capture Phase (capture phase): Due to the switching of frequency points, the frequency changes sharply from stable to unstable, the phase difference between the output frequency and the phase detection frequency of the reference clock is very large, and the phase-locked loop is in an out-of-lock state, requiring a large number of pump current to capture the target frequency.
[0065] T2: Track Phase: The phase difference between the output frequency and the phase detection frequency of the reference clock is small, and the phase-locked loop tracks the output frequency, which belongs to the stage of loop self-regulation.
[0066] T3: Stable Phase: The phase difference between the output frequency and the phase detection frequency of the reference clock is very small, and the phase-locked loop is in a locked state. When the frequency deviation is less than ±100Hz, the phase-locked lo...
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