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about parameters simulation of opa

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lunren

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simulation parameters of opa

Hi everybody:
I want to simulate the THD(harmonic distortion) and equivalent input noise of a opa, but how can I do it? thank you for your help.
 

What's your simulator?
If it is Hspice, noise analysis can get the equivalent input noise.
I am not familiar with the harmonic distortion. I want to know too.
 

to flyinspace:

But how to simulate the equivalent input noise in Hspice using noise analysis, hope you can give me some hint. thank you
 

got to the manual and look after noise analysis. Normally you have to specify an output node and a noise summing node (in general your input)

In some simumlators noise analysis is performed with the .AC statement
 

Re: to flyinspace:

lunren said:
But how to simulate the equivalent input noise in Hspice using noise analysis, hope you can give me some hint. thank you
Click to expand...

Here is a example:

* Noise simulation netlist
.include 'opamp.sp'
XDUS IN+ IN- OUT VDD VSS OPAMP
VDD VDD 0 5.0
VSS VSS 0 0.0
VIN- IN- 0 2.5
VIN+ IN+ 0 2.5 AC 1.0 0
.AC DEC 10 1 1G
.NOISE V(OUT) VIN+ 10
.PRINT INOISE ONOISE
.END

Inoise and onoise will be printed at the end of hspice output file. Inoise is the input equivalent noise.
 

As to analysis of distortion,you can run the FFT analysis and check the amplitude of the harmonics.
 

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