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.J:>.
~
0\
fr
" .
PHASE
COMPARATER
II'
" .
fN
DIGITAL TO
ANALOG
LOW PASS
. .
CONVERTER
....
FILTER
DIVIDE
L..
BYN
:-.
NOTE:
FOR NORMAL OPERATION
. fo-f, x N
WHERE:
fo. OSCILLATOR FREQUENCY
fr. REFERENCE .FREQUENCY
N - DIVIDE BY NUMBER
~
" .
fo
Figure 4-9. Typical Phase Lock Loop Functional Block Diagram.
VOLTAGE
fo
CONTROLLED·
-.
OSCILLATOR
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