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Transistor operating point

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ashrafsazid

ashrafsazid

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Hi,

In case of folded cascode amplifier, if we have a PMOS load (on top of diffferential pair) , is it necessary to keep them in saturation for maximum gain? or we can keep the differential pair in saturation only?
 

What is a formula for the gain? How this gain will change if these current sources goes into linear?
 

Dominik Przyborowski said:
What is a formula for the gain? How this gain will change if these current sources goes into linear?
Click to expand...

If the current source goes to linear region then the output resistance for the curremt source will decrease and hence the gain will decrease. am I right?
 

ashrafsazid said:
Hi,

In case of folded cascode amplifier, if we have a PMOS load (on top of diffferential pair) , is it necessary to keep them in saturation for maximum gain? or we can keep the differential pair in saturation only?
Click to expand...
MOst of time, you want to keep PMOS load in saturation to achieve high gain and reasonable input offset. If they are not, double check the gain and input offset.
 

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