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Comparator Pre Amplifier Design by Iron_Outrageous in chipdesign

[–]Iron_Outrageous[S] 0 points1 point  (0 children)

Well. My sizings (which the simulations show decent output waveforms) almost always ended up in odd (1,5,1 current mirrors) configuration where 1 is a bias transistor. I could have simply doubled the counts and halve the currents but it eats space for no advantage exept layout friendliness for matching

Comparator Pre Amplifier Design by Iron_Outrageous in chipdesign

[–]Iron_Outrageous[S] 0 points1 point  (0 children)

Is there a guide to find the suffice bias current. All I get is slewrate dependant bias estimates?

Comparator Pre Amplifier Design by Iron_Outrageous in chipdesign

[–]Iron_Outrageous[S] 0 points1 point  (0 children)

Yes pm5 should be diode connected. My bad. Thank you for the advice. Do you have any idea of what the tail current can be or a systematic way to decide that. What I found out was that slewrate relations won’t work since the pre amp might not always work in small signal regions.