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which differential amplifier configuraion should i choose?

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samuel

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Now, I want to design differential amplifier tused to substract the two signals from correlated double sample(CDS).

input signal range : 3~3.9, that is to Vin+ ≤3.9 and Vin-≥3.
powe supply:5V
frequencey:≥5M
load: capacitance:15p

anyone can give me some advice?

thanks.

samuel.
 

leo_o2

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what's supply voltage? Signal frequency? Power consumption? Driving capability?
 

    samuel

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castrader

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N-input-pair better for high input cm level,
and your working freq is high, also you need only drive cap loads, so 1-stage folded-cascode is good for your design.
Take care to your GBW and SR.
 

    samuel

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yxo

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Re: which differential amplifier configuraion should i choos

castrader said:
N-input-pair better for high input cm level,
and your working freq is high, also you need only drive cap loads, so 1-stage folded-cascode is good for your design.
Take care to your GBW and SR.
N-input pair has better matching and more gain. But why better for high input level? Comment pls. Using p-input you get more slewing and less noise
 

    samuel

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