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3-stage amplifier vs two-stage amplifier (Read 3298 times)
ywguo
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3-stage amplifier vs two-stage amplifier
Feb 05th, 2015, 2:15am  
Hi Guys,

What's the advantages of 3-stage amplifier considering bandwidth and slew rate compared with 2-stage amplifier? This question looks like a very open discussion. Any comments are appreciated.


Yawei
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raja.cedt
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Re: 3-stage amplifier vs two-stage amplifier
Reply #1 - Feb 5th, 2015, 4:23am  
It's hard to answer.
You will always end up with lower bandwidth in 3 stage amp, because 3 non dominate poles compared to 2 stages. Slew rate mostly architecture dependent.

Thanks,
Raj.
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Rakesh
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Re: 3-stage amplifier vs two-stage amplifier
Reply #2 - Feb 5th, 2015, 7:53am  
Hi,
If you want to compare with the same DC gain as the 2 stage amplifier, then you might be able to increase the bandwidth by appropriately distributing the gain across the stages. However it still depends on the architecture and the load. Slew rate depends on the architecture.

Rakesh
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loose-electron
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Re: 3-stage amplifier vs two-stage amplifier
Reply #3 - Feb 6th, 2015, 11:00am  
Depends on performance criteria and process considerations.

Define performance end to end and then fit a solution into it is my perspective.
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carlgrace
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Re: 3-stage amplifier vs two-stage amplifier
Reply #4 - Feb 6th, 2015, 3:26pm  
Not sure if there are any advantages regarding BW.  A single-stage amplifier is always fastest in a given technology, then 2-stage, etc because of the reason Yawei said.

I've only seen people use 3-stage amplifiers when they needed super-high DC gain.
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