Page 263 - Phase-Locked Loops Design, Simulation, and Applications
P. 263
The current waveform shown in Fig. 6.23 creates an AC signal u f,ac at the output of the loop
filter (cf. Fig. 2.17b for a first-order loop filter), and this AC signal will modulate the
frequency of the VCO, thus generating spurs at multiples of the reference frequency f . To
ref
get an estimate of these spurs, we restrict
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