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THD for GM-C filters in CADENCE

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student14

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I want to calculate THD of Gm-C filter in CADENCE. I want to plot the harmonics. There is a thd function in calculator but it return the value of thd in percentage. I want to plot the harmonics. How can I find HD2, HD3. I found different forums mentioning to simulate the transient response at output and find FFT. But I dont have the FFT function in my calculator. Can anyone suggest an appropriate solution.

What if I use DFT function?
 

Use correct terminology.

student14 said:
I want to calculate THD of Gm-C filter in CADENCE.
Click to expand...
What do you mean by "in CADENCE" ?

student14 said:
I want to plot the harmonics.
Click to expand...
Simply plot them.

student14 said:
There is a thd function in calculator
but it return the value of thd in percentage.
Click to expand...
Can you undetstand "thd" surely ?
https://www.edaboard.com/showthread.php?380350#2

student14 said:
I want to plot the harmonics.
Click to expand...
Again, simply plot them.

student14 said:
How can I find HD2, HD3.
Click to expand...
https://www.edaboard.com/showthread.php?378135#6
https://www.edaboard.com/showthread.php?378136#4

student14 said:
What if I use DFT function?
Click to expand...
If you mean Cadence Skill function, dft(), you can use it for FFT.
 

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