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RT. Is there any reference about this problem. I am going to design a pipelined ADC, but lack of basic knowledge. Is there anybody can give some useful suggestion or reference?
Sometimes por work after the bandgap, sometimes por begin to work because of the rise of the Vsupply. So two kinds of por is different, there are different kinks of solution to them.
Re: opamp and CMFB-
It depends on your circuit. If the gain of both two stages is very high, you need two CMFB. If one stage's gain is very low(<0.5), you don't need CMFB in this stage.
If you mean this kind of VGA is linear in dB and the outputs controled by the input difference of current, I read some papers about the function of (1+x)/(1-x)=e^2x,
sometimes some one will use the current to fulfil this function,for example (I+I1)/(I-I1), the ratio of I1/I is the same meaning of x.
Does your circuit work like this? When the VDD begin to get higher and higher, bandgap work normally, after that, por start to work, then the chip begin to work.
If your chip work like this, you can use your own idea.
You can use the buffer to get the three different output voltage, but in real ADC design, it's always more difficult than this. You can find some papers of reference buffer. You need to see some datasheet to check the spec of your design.
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