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Basic Frequency SynthesizerQuestion

S

Sommes

Jan 1, 1970
0
If I put a SN7490(divided by five) IC in a Frequency Synthesizer PLL
cirucit. Is it equal to input frequency * 5?

Cheers
 
D

dB

Jan 1, 1970
0
Sommes said:
If I put a SN7490(divided by five) IC in a Frequency Synthesizer PLL
cirucit. Is it equal to input frequency * 5?

The output of the chip, using just the divide by 5 section, will be
one fifth of the input frequency, not 5 times.

Your good health.
 
B

Bob Masta

Jan 1, 1970
0
If I put a SN7490(divided by five) IC in a Frequency Synthesizer PLL
cirucit. Is it equal to input frequency * 5?

Cheers
If you put it between the output of the VCO and the
reference input of the phase comparator, then the
VCO output frequency will be 5 times the frequency
on the external input to the phase comparator, on
average. The output of the divider will be 1/5 of the
VCO output and will equal the external input.


Bob Masta
dqatechATdaqartaDOTcom

D A Q A R T A
Data AcQuisition And Real-Time Analysis
www.daqarta.com
 
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