Help! two stage differential amplifier failing at fastslow and slowfast cornor

[ajetivarg]

Hi,

I am designing a two stage differential amplifier with gain 25dB. The input supply of the circuit is 1.1 v, my power consumption can be a maximum of 15uA, and my operating frequency is 5Mhz. I have designed the circuit but my circuit is working well at tt, ff and ss corners, But its failing at fs and sf corners. Can anyone over here point me towards the right direction, how to make it work across all the corners.

regards,
ajetivarg

 

[Dominik Przyborowski]

Run only SF or FS corner and check DC ops.

 

[dick_freebird]

We don't know what it's failing for. But this limited description
makes me think you're sensitive to VT similarity between
N and P devices, while some common process skew actors
jack them oppositely.

This might be from (say) using a MOSFET as a resistor
biasing an opposite-type current mirror rack, or from
trying to make a Class AB output using P vs N "matching".

But you'd have to figure this out for yourself since you've
told us nothing useful other than "Wahhhh!".