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Analog Electronics
book

Analog Electronics

by Ian Hickman
October 2013
Intermediate to advanced content levelIntermediate to advanced
342 pages
16h 43m
English
Newnes
Content preview from Analog Electronics
Signal sources 237
-12
dB/octave
ω
increasing ωι
\ -1.0
/ ω increasing
ω,/ΙΟ I log/
Η
h
(c)
Figure 9.19 PLL with second-order active loop
filter.
ω
increasing ^
(b)
To
zero frequency
where the loop filter is an integrator as in Figure
9.19c; this is an example of a high-gain second-
order loop. With the 90° phase lag of the active
loop filter added to that of the phase detector,
there is no phase margin whatever at the unity gain
frequency; as Figure 9.19b shows, we are heading
for disaster (or at least instability) at ωι. By
reducing the slope of the roll-off in Figure 9.19a to
6 dB per octave before the frequency reaches ω,
(dashed line),
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Publisher Resources

ISBN: 9781483162287