which differential amplifier configuraion should i choose?

[samuel]

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]

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

 

[castrader]

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.

 

[yxo]

Re: which differential amplifier configuraion should i choos

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