资 源 简 介
Harmonic locking is simpler and usually can be achieved by setting the VCO free-running frequency to a multiple of the input frequency and allowing the PLL to lock. However, a limitation of this scheme is that the lock range decreases as successively higher and weaker harmonics are used for locking. This limits the practical harmonic locking range to multiples of approximately less than ten. For larger multiples, the second scheme is more desirable.
