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[SOLVED] Verilog implementation for d/dt time derivative

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star_golden

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Hello,

I am trying to implement Capacitor and Inductor models in Verilog.
These models have Voltage and Current equations which involve time derivative dI/dt and dV/dt.
In Verilog AMS, we have a built-in function ddt().

But How do I implement these time derivative functions in Verilog ?

Can anyone please help ?

Thanks and regards
 

Genrate time points with enough small time space.
Then approximate ddt() by time diffrence of one order or second order.
 

Hi pacho_hideboo,

What I understand from your post is :
dI/dt = ((I at time 1 - I at time 0) + (I at time 2 - I at time 1)) / (time 1 - time0)

Is this correct ?
 

Last edited:

If f(t) changes linearly and time points are also linear (they are evenly spaced ) then, output df/dt will be a constant.
Even though the input is changing linearly with time, output remains constant.
Am I missing anything here ? How to solve this situation ?
 

star_golden said:
If f(t) changes linearly and time points are also linear (they are evenly spaced ) then, output df/dt will be a constant.
Click to expand...
f(t)=a*t
df/dt=a ; constant

star_golden said:
Even though the input is changing linearly with time, output remains constant.
Am I missing anything here ?
How to solve this situation ?
Click to expand...
I can not understand what you are confusing at all.
 

How to solve this situation ?
Click to expand...
How to solve what? You are describing an elementary property of derivative.

By the way, you are dealing with finite numerical quantities. So f(t) can't endlessly increase, it has to decrease at times and df/dt won't always stay constant.
 

Yes.. Thanks FvM, pancho_hideboo.
I got it and fixed my problem.

Thanks
 

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