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A PLL operates with input and output frequencies equal to f1. Suppose the input frequency and hence the output frequency are changed to f1/2. Assuming all loop parameters remain unchanged and neglecting the continuous-time approximation issues, explain which one of these arguments is correct and why the other one is not:
(a) The PFD now makes half as many phase comparisons per second, pumping half as much charge into the loop filter. Thus, the loop is less stable.
(b).
Assume that the outputs are matched.
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