Divide by 3 or Divide by n Counter

• Apr 19, 2004

• #1

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ramana_k22

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divide by n counter

Hi all,
I want to know how to design a divide by 3 counter with 50% duty cycle.
Ramana

 

• Apr 19, 2004

• #2

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kaven

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divide-by-n counter

1. simply use a 2 bit synchronous johnson counter with truth table as 00/01/11....( initial as 11 / Q1, Q0 / Q0 as LSB )
2. a independent T-FF whose clock come from CK*Q1*Q0 + /CK*/Q1*Q0, the output of T-FF is required
3. If full synchronous is required, more complex one similar as about

 

• Apr 19, 2004

• #3

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brmadhukar

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divide by 3 frequency divider

Hi,
Use DCM module which I know is in Xilinx.
BRMadhukar

 

• Apr 20, 2004

• #4

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vempus

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divide by 3 counter

Design a counter asynchromous will be easier using 2 JK flip flops
Use 2 JK flip flops Use the out put of LSB and MSB through a nand gate to trigger the clear pin of the flip flops to restart counting

 

• Apr 20, 2004

• #5

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Btrend

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synchronous divide by 10 counter

try this

 

• Apr 20, 2004

• #6

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silver_kiss

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design of divide by 3 counter

just go through this!!!
all the best

 

• Apr 23, 2004

• #7

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what is a divide by n counter

I'll try 2 sum up the steps:
1. Generate two clocks at half the desired frequency with a quadrature-phase relationship (constant 90° phase difference between the two clocks).
2. Generate the output frequency by exclusive-ORing the two waveforms together. 'coz of the constant 90° phase offset, only one transition occurs at a time on the input of the exclusive-OR gate.

Reference taken from the file attached...
It gives description of majority type of clock dividers..

Hope it helps u...

tut..

 

Attachments

• clock_dividers_made_easy.pdf

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• Apr 25, 2004

• #8

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ddt694

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design a divide-by-7 counter

my design[/img]

 

• Jun 14, 2004

• #9

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waxdog

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divide by 3 counter + xilinx

Refer any PLL book.

 

• Jun 14, 2004

• #10

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yeechyan

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divide by 3 design

Try to use a divide-by-two frequency divider to generate a signal with half the frequency of the original. And then use an AND Gate to sum up the original and the divided signal.

 

• Apr 19, 2005

• #11

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savadi

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n counter

Use a 3bit counter

 

• Jan 6, 2010

• #12

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srinisv

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Re: design of divide by 3 counter

silver_kiss said:

just go through this!!!
all the best

Click to expand...

Good Document Thanks

 

• Jan 22, 2010

• #13

neils_arm_strong

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Re: divide by 3 design

yeechyan said:

Try to use a divide-by-two frequency divider to generate a signal with half the frequency of the original. And then use an AND Gate to sum up the original and the divided signal.

Click to expand...

That will give a divide by 2 with 33.33% duty cycle.

 

• Apr 6, 2011

• #14

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dhaval4987

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Re: divide by 3 design

Use 2 D-FFs, say D1 and D2. both operate on same CLK. And D2=Q1. D1= (Q1 Nand Q2).

 

• Jun 19, 2012

• #15

Baas Rietrot

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Re: divide by 3 design

Double the frequency and divide by 6. Multiplying can be done with a RC circuit and a XOR gate. Divide by 6 with 3 flip-flops and a XOR gate.
This circuit will give a 50% duty cycle.

It can be done with the following circuit.



**broken link removed**