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How to make sure the op-amp is correct??

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ronanchang

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I am trying to design the cascode op-amp.
how can i know the op i designed is correct?
Is there something that I must take care???
 

The amplifier you have designed, must be for some specifications.
i.e UGB, Gain, Phase margin, ICMR, PSRR, Noise etc.
The amplifier designed, has to be used in some closed loop configuration, see fro the stability, its frequency responce, slewrate etc.
Hope it helps
 

you have to check your specs of the opamp at every process corners and check for the phase margin not to be less than 60 degree for stable close loop performance
 

ambreesh said:
The amplifier you have designed, must be for some specifications.
i.e UGB, Gain, Phase margin, ICMR, PSRR, Noise etc.
The amplifier designed, has to be used in some closed loop configuration, see fro the stability, its frequency responce, slewrate etc.
Hope it helps
Click to expand...

Where can find some test circuit examples to demo how to measure these amplifier
specifications?

Thanks,
 

sergio franco's book "Design with Opamp and Analog IC"
 

At least, you can try AC analysis to check the gain phase margin. It is the basic check for a opamp.
 

First, you know the performance parameters of Op Amp, such as DC gain, GBP, CMRR, PSSR etc. Then you simulated it. Depend on your applications, you will trade off among those parameters.
 

Dear eda_heat,
You can search for chraterisation of an amplifier. Allen hollerberg also gives it.
Also you can goto the following site
**broken link removed**
 

What about the maximum voltage swing of your op-amp?
 

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