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What is the main difference between an ordinary op-amp and a telescopic op-amp?

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A.Anand Srinivasan

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what is the main difference between an ordinary op-amp and a telescopic op-amp......

can someone illustrate the difference with circuits.........
 

Re: telescopic op-amp

Try referring to Razavi or Johns and martin.
 

Re: telescopic op-amp

Telescopic op amp is faster than two stage or diffrential , it also provides high gain.
 

Re: telescopic op-amp

telescopic opamps limit the output swings unlike 2-stage. miller effect dominates 2-stage topology's low speed.
 

Re: telescopic op-amp

this is basic for us.

you can refer to analog design book!!
 

telescopic op-amp

Telescopic op amp is mainly for gain not speed.
 

telescopic op-amp

Razavi's book has some comparason between telescopic, folded-cascode and 2 stage opamps:
during the three, telescopic is the fastest opamp, but it suffer the drawbacks of input/output Common-mode binded together and the headroom.
2 stage can provide lots of gain but it's slowest one.
folded-cascode falls between them.
 

telescopic op-amp

Many analog books analysis that, razavi, John and mardin,sansen...
 

Re: telescopic op-amp

it is there in gray and mayer
 

Re: telescopic op-amp

Yes, telescopic op-amp gvies you a high gain ,but there is also a trade-off for your phase margin. Thus, you need to play with your VON and pay attend on 1/gm and CL's value.
 

Re: telescopic op-amp

headroom headroom headroom...

if you have plenty of this, then telescopic and/or folded-cascode could be a good choice.. the main advantage is not just the high-gain but also the self-compensating property of the topology because of the high resistance node in the output cascode stage.
 

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