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What about the Input signal fo ADC?

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leonken

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In general , what are the specifications of the input signal which will be sampled by ADC ?
How large is the input signal amplitude?
How large is the input signal frequency?
How large is the input signal power?
 

Your question is just to general..
If I say that most of ADC will have input range 0-5V it will be only partialy true.
Input signal max frequency? That depends on the sampling rate. Again, you can find ADCs which can comvert in ms, µs, ns...
Input signal power? I would use the word "negligible"..somewhere in µWs region..
 

you mean that no negative input signal, only positive input signal (large than 0 )?
 

Depending on the A/D converter it can digitize any range like -1 to 1V or 0 to 2V or 0 to 5V etc. choose the right one according to your application !
 

Is it very difficult to test ADCs after fabrication? thanks.
 

I think the most difficult thing is having good instruments such as good performance signal generator, logic analyzier etc.
 

YOu need test LSB and all ones, and one in MSB other all zero. If differential, the negative.
 

I think the testing depends on the resolution of the ADC you designed.

If the Spec is lower than some DAC in the market. you can buy one and design a test board by yourself. it is not necessary to have a high performance instrument.
 

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