# Frequency Divider and Multiplier

Discussion in 'General Electronics Chat' started by msseng, Jan 28, 2009.

1. ### msseng Thread Starter Member

Jan 19, 2009
11
0
I need a n analog frequency multiplier (x3)
and then need an analog programmable frequency divider (/N) where N is between 800 and 1000 by step 1.
Is there any module for this goal?!

thanks

2. ### eblc1388 Senior Member

Nov 28, 2008
1,542
102
I have not yet built the following frequency multiplier circuit but it works in simulator. It multiplies the input frequency by 3. The source of the original article is here:

Two-Diode Odd-Order Frequency Multipliers

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3. ### hgmjr Moderator

Jan 28, 2005
9,030
214
On what range of input frequencies do you need your divider to work?

Does the output of the divider need to be sinusodal or can it be a square-wave?

hgmjr

4. ### msseng Thread Starter Member

Jan 19, 2009
11
0
The input frequency is less than 2KHz.
I want to multiple it by 3 and then divide it by N (is between 800 and 1000 with step 1)
I think it must be a digital input programmable circuit that can divide input frequency, but I need an analog input and out put.
and I need Sine Wave...

Last edited: Jan 31, 2009
5. ### msseng Thread Starter Member

Jan 19, 2009
11
0
Thanks...
But I don't think it works at very low frequency!!!

6. ### eblc1388 Senior Member

Nov 28, 2008
1,542
102
Sorry we don't have a crystal ball to tel us what frequency you are using.

Since your other post mentioned about a project on 10MHz, I thought it is a sensible guess to show a circuit working on 10MHz.

7. ### Wendy Moderator

Mar 24, 2008
20,772
2,540
Have you thought of PPL frequency multiplication? It is extremely precision, and fairly wide band.

Apr 5, 2008
15,798
2,384
Hello,

Bill is right. A PLL can make a stable multiplier over a pretty large frequency range.
Take a look at the 4046 PLL chip.

When you use a divider of 3 times between the VCO and the phasecomparator, the output of the VCO will be 3 times the input frequency.
Use comparator 1 , this will also lock on harmonics.

For the calculations for the resistors and capacitor of the VCO, take a look at this picture.

Greetings,
Bertus

9. ### msseng Thread Starter Member

Jan 19, 2009
11
0
You don't need crystal ball, you need open eyes, because I mentioned what you need in post #4!!!

10. ### msseng Thread Starter Member

Jan 19, 2009
11
0
Thank BERTUS!
I'll investigate it and say you.

11. ### Wendy Moderator

Mar 24, 2008
20,772
2,540
Yes, but his original response, complete with the circuit simulation that you dismissed casually, was on post #2. Try courtesy for those trying to help, or you might find people willing to help in short supply next time. He put time and work into that simulation, and you need to remember we are all volunteers here.