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I want to compute the RMS value of a sine.
I use AD736 and I have a problem with Multisim/Pspice simulation, I do not get the properly results.
Sample configuration (I took it from datasheet, https://www.analog.com/static/imported-files/data_sheets/AD736.pdf )
Spice model of AD736...
The problem is that results from simulation Vout=-1.33 V with Vin=3 v don't match the results from the value (result from voltimeter) in the circuit which is -1.164 v
I'm using this circuit:
But as you can see voltimeter value in my circuit is not the same like value in the transient simulation.
I took this circuit from : **broken link removed**
Thank you very much in advance
Thank you very much for your reply.
So I have to mount the circuit and then calculate the Is from my lab results and using the formula. This circuit is going to be used to create TRUE-RMS altern-continous converter and I'll create more than one, so I have to calibrate each one. Each time I...
For example:
25º
Forward current is the current which goes through diode?
And then I'll get a Forward Voltage, from it how can I get the saturation current?
It's not necessary to say that I'm a very newbie.
If my circuit works I prefer to use this basic configuration and leave a more complicated one for the future.
How can I calculate the Is if I use this diode:
https://www.vishay.com/docs/81857/1n4148.pdf
I don't know how to get it from the specifications. I'll appreciate it if you can give...
Thank you very much for your responses.
Prototyp_V1.0 I use 0.026v for -Vγ.
erikl using Is=2.68nA instead of 25nA results get a little closer but I need to be more accurate.
FvM, so which value do I need to use for Is in the formula above?
Does anybody know if using this configuration I can...
I'm involved in an educational project and I want to design a logarithmic amplifier based on ua741. Following capture shows my circuit:
Diode is 1N4148
Resistor Value is 33Kohms
And the results in lab and simulating don't match the results using the following formula:
Vin= 6v
Vdd+=15v...
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