Triangular to Division with AD633

Thread Starter

Nikos Mparoutis

Joined Oct 8, 2016
19
Hello i have for input a triangular function and i do the the division with AD633.
the division with DC input has right results but wronmg with triangular.The AD633 itself has right results with triangular, the issue is on the op amp or the design.I checked the op am datasheet and is is ok for this frequency (almost 40 khz)
help ?Thanks
 

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GopherT

Joined Nov 23, 2012
8,012
Hello i have for input a triangular function and i do the the division with AD633.
the division with DC input has right results but wronmg with triangular.The AD633 itself has right results with triangular, the issue is on the op amp or the design.I checked the op am datasheet and is is ok for this frequency (almost 40 khz)
help ?Thanks
Help us first with a schematic and a link to the datasheet(s).

And clarify if you are dividing frequency or voltage.
 

Thread Starter

Nikos Mparoutis

Joined Oct 8, 2016
19
The multiplier works for triangular input but for the same Vpeak and frequency the sawtooth function i created throws simulation error.
Can somebody explain why ?Is this a problem with the multisim ?
I uploaded the simulations and the datasheet for help
Vo=X1*Y1/10 from the multiplier
Thanks !
 

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crutschow

Joined Mar 14, 2008
27,477
The signal with the error you show is not a triangular wave (which has equal rise and fall times),
The are both sawtooths with one having a fast risetime and the other having a fast falltime.

Below is the LTspice simulation of the signal (I think) is causing you a problem.

upload_2016-10-30_11-41-33.png
 

Thread Starter

Nikos Mparoutis

Joined Oct 8, 2016
19
Thank you for the help Cruts,
I show the triangular as an example becasue with triangular signal it works but with sawtooth (which is what i want for the almost the same frequency and amplitude) does not works.
So as you said the problem is the fast rising time ? Βut i want a sawtooth not a traingular ,if i increase the risetime it is not a good enough sawtooth.Is there a way to solve this ?
 

Thread Starter

Nikos Mparoutis

Joined Oct 8, 2016
19
The AD633 multiplier who takes input a triangular from 555 timer crashes. I tried many triangular from the function generator and it works but i tried many triangulars from 555timer and it fails.
How to solve this,it is so confusing.
Output from multiplier Vo =X1*Y1/10 it is from the datasheet
 

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crutschow

Joined Mar 14, 2008
27,477
the simulation fails ,i would be very happy if the output was wrong,i could fix it but now it is confusing
Simulation failure is a common problem with all Spice simulators.
What is the error message.
Sometimes just a small change in some of the circuit values will eliminate this failure.
Try simulating just parts of the circuit at a time to see if you can isolate he failure point.
 

Thread Starter

Nikos Mparoutis

Joined Oct 8, 2016
19
i thought of this divide and conquer practice but still fails.I took only the multiplier with only the triangluar wave from the 555 timer's circuit...There is not something smaller than this :/
The simulation Says: Error because the matrix is singular
 

Thread Starter

Nikos Mparoutis

Joined Oct 8, 2016
19
the multiplier works with the traingular function from the function generator BUT from the 555 timer simulation crashes and the message says
"Singular Matrix".
Ι can send the circuit to simulte it with this multiplier to test it with multisim if you want,because it does not makes sense to me and i have stuck for 2 weeks.
 

Thread Starter

Nikos Mparoutis

Joined Oct 8, 2016
19
I donne some research and i found that decoupling maybe is a problem
The green is the output from the triangular ,the red from the multiplier.
Also somebody else had the same hard problem and he found that with input +V to -V there is not problem with the AD633 but if we have input +V to 0V error occurs.
Please comment
 

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