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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?
 

leo_o2

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Muilti-stage might make loop compensation more complex.
 

jgk2004

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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
 

ic98

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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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