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Phased
Locked Loop (PLL) Circuits, Page
5
PLL's: #'s - A B - O
PQ - Z Last Updated on:
Monday, October 03, 2011 06:07 PM
Links to electronic circuits,
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Rolled-Off Noise Source - This is a circuit that generates white noise,
rolled-off to drive earphones or a small speaker. White noise creates is a
"rushing" sound, which sounds something like air rushing by your ear(s). White
noise would be flat with frequency,.... (circuit added 6/07)
Unlocked PLL Retains Locked Frequency - 07/20/95 EDN-Design Ideas: Using the
PC2 in-phase comparator output, the circuit in Fig 1 keeps the unlocked, or
free-run, frequency of a 74HC4046 PLL near the locked frequency. With no signal
input, the VCO output normally adjusts to its lowest frequency (one-half the
locked frequency, f0). In some applications, such a large frequency excursion may
be undesirable. With the addition of D1, R3, C2, R4, and the 74HC04 inverting
buffer, the free-run frequency remains near the locked frequency in the absence of
a signal input.....(design idea added 3/03)
