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the trade off between multistage and gain boosting opamp

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zeldazzz

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To achieve the highest gain bandwidth, which one is more reasonable, multistage(3 stage) or gain boosting with 2 stage?
 

Muilti-stage might make loop compensation more complex.
 

Multistage is much easier to reach higher GBW with lower power. Gain boosting is used to acquire more DC gain. For all of my designs and pushing high GBW's in a technology with low power, i used 3 to 4 stage designs always.

Jgk
 

Multistage is easier but does not fundamentally have lower power dissipation, because you must consider loop stability, so more compensation cap.
Using gain-boosting approach, power diss. maybe becomes lower (less parasitics and high-impedance nodes) but you must care about the existence of zero-pole pairs that can lead to slow-settling components.
 

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