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CD4060B unable to get exact output

 

Hi ,
 
I m using CD4060B model to generate the required waveform but facing issue when i try to generate the output by cascading output of one stage to another stage .
 
Can anyone let me know what is wrong in the attached circuit .How can i cascade the output of first stage to another stage.
 
Regards,
Vipin
 
 

On 03/12/2024 09:00, vipin.mishra via groups.io wrote:
I m using CD4060B model to generate the required waveform but facing issue when i try to generate the output by cascading output of one stage to another stage .
 
Can anyone let me know what is wrong in the attached circuit .How can i cascade the output of first stage to another stage.
You cannot "attach" circuits. Attachments are stripped off your message. Please re-read the group homepage, especially the bits about uploading schematics. Remember to include all files that didn't come with LTspice - models, symbols, etc. If your upload consists of more than one file, please put them all in a zip before uploading to Files > Temp.

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Regards,
Tony
 

On Tue, Dec 3, 2024 at 03:00 AM, <vipin.mishra@...> wrote:
I m using CD4060B model to generate the required waveform but facing issue when i try to generate the output by cascading output of one stage to another stage .
 
Can anyone let me know what is wrong in the attached circuit .How can i cascade the output of first stage to another stage.
When you cascaded the second stage, you changed the name of net "Q4" to "test".  But your plot file still tries to plot V(Q4), which is no longer there.  That's why the middle plot pane is blank.  Remember, every net can have only one name.  By assigning more than one net name to the same net, you force LTspice to choose one and ignore the others.
 
Does that answer your question?
 
It is hard to know what you meant by "facing issue" without saying what was the issue.
 
Andy
 
 

On 03/12/2024 09:00, vipin.mishra via groups.io wrote:
I m using CD4060B model to generate the required waveform but facing issue when i try to generate the output by cascading output of one stage to another stage .
 
Can anyone let me know what is wrong in the attached circuit .How can i cascade the output of first stage to another stage.
There are two problems with your circuit:
  1. You cannot feed the second CD4060B from Q4 of the first into the CX (pin9) input because it will be shorted out internally by the 2nd inverter in the oscillator circuit - see the internal schematic on page 1 of the datasheet. Feed into the RS input of the 2nd CD4060B instead. you can also remove R3 and R4.
  2. You have also shorted together the Q14 output of the first CD4060B and the Q4 output of the second CD4060B by giving them the same net name.
Fix those two issues and it works, as expected.

--
Regards,
Tony
 

Vipin,
 
You duplicated your .MEAS commands, which results in a conflict because the same name is used multiple times.  I guess you forgot to delete the replicated .MEAS commands.
 
Andy
 
 

On 03/12/2024 11:55, Tony Casey wrote:
On 03/12/2024 09:00, vipin.mishra via groups.io wrote:
I m using CD4060B model to generate the required waveform but facing issue when i try to generate the output by cascading output of one stage to another stage .
 
Can anyone let me know what is wrong in the attached circuit .How can i cascade the output of first stage to another stage.
There are two problems with your circuit:
  1. You cannot feed the second CD4060B from Q4 of the first into the CX (pin9) input because it will be shorted out internally by the 2nd inverter in the oscillator circuit - see the internal schematic on page 1 of the datasheet. Feed into the RS input of the 2nd CD4060B instead. You can also remove R3 and R4.
  2. You have also shorted together the Q14 output of the first CD4060B and the Q4 output of the second CD4060B by giving them the same net name.
Fix those two issues and it works, as expected.
Fixed schematic uploaded as CD40060BTest_ATC.

--
Regards,
Tony

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