calven303
Member level 3
hi!
i am a freshman in pll.i am reading best's book.i wonder if my understanding is right.
the book builds a linear model assuming the pll is in the locked state and the reference frequency is equal to the frequency of the divider's output signal(PD is a multiplier).but when the model is actually used,the reference frequency is not the same with the frequency of the divider's output signal(such as the referency frequency increases to another) while the pll is still in the locked model.why the model is still valid?we consider that the reference frequency does not change ,but the reference phase changes like a ramp function?
give me some advice,please
thanks a lot
i am a freshman in pll.i am reading best's book.i wonder if my understanding is right.
the book builds a linear model assuming the pll is in the locked state and the reference frequency is equal to the frequency of the divider's output signal(PD is a multiplier).but when the model is actually used,the reference frequency is not the same with the frequency of the divider's output signal(such as the referency frequency increases to another) while the pll is still in the locked model.why the model is still valid?we consider that the reference frequency does not change ,but the reference phase changes like a ramp function?
give me some advice,please
thanks a lot