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How to design different stages of chopper-stablized opamp?

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jiaming_lee

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chopper-stablized opamp

basically, chopper-stablized opamp is used for offset and noise minimization. But How to design the different stages of the opamp, including CMFB, how to design the MOS switches, including the distortion minimization, and how to define the chopper frequency? Is there any recent paper or books to be referred?

Thank you
 

flatulent

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Re: chopper-stablized opamp

The frequency selection should be twice or more the maximum input signal frequency.

Is this a school project? You would not design a chopper amplifier in industry because there are better ways to get the circuit performance.

In the old days with valve/tube amplifiers they used vibrating relays for the chopper and this was a drastic increase in performance for the times.
 

willyboy19

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Re: chopper-stablized opamp

Chopper amplifier is still widely used in nowdays, even though you have all the fancy ADC and DSP algorithm to deal with offset and 1/f noise. Check the instrumentation amplifier design guidelines from ADI and you may find some answers there.
 

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Re: chopper-stablized opamp

I am just curious to know what are the techniques the industry uses nowadays if not chopper stablization and autozeroing techniques. Laser trimming to reduce the offset?
 

jiaming_lee

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Re: chopper-stablized opamp

willyboy19 said:
Chopper amplifier is still widely used in nowdays, even though you have all the fancy ADC and DSP algorithm to deal with offset and 1/f noise. Check the instrumentation amplifier design guidelines from ADI and you may find some answers there.

Thanks, what do you mean "the instrumentation amplifier design guidelines from ADI" ? Does ADI put some technical paper about chopper on their WWW?
 

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