High speed amplifier with 50ns settling time

[engrvip]

high speed amp settling time

can somoene suggest a suitable architecture and techniques i should follow in designing a high speed amplifier with 50ns settling time????

if u have some relevant study material regarding my querry plz give info. regarding it??

thanks

 

[hr_rezaee]

“indirect feedback compensation of cmos op-amps

Hi
it depends your gain too.
maybe simple telescopic cascode
or gain boosted telescopic cascode

regards

 

[kwkam]

It depends on what is you specific for example slew rate, step voltage.... Hard to said possible or not.

 

[lijianheng]

It depends on your cuicuit dc gain, gain bandwith. It should can be achieved.

 

[yalanand]

You cant go for telescopic if your voltage is low...

 

[engrvip]

supply voltage is 3.3v

0.35 u technology

have to use it as buffer to drive heavy load.

High i/p and o/p swings needed.


now plz suggest me what architecture should i use......intitially i thought of using class AB ip stage opamp....but then decided to go ahead with Folded cacode architecture.....is it OK to go ahead with FC....as high swings will be a problem in telescopic structure.

 

[wael_wael]

i suggest u use folded cascode with CS out put stage it has high swing output, high settling time, use Nmos transistors as differential input

 

[gaom9]

This paper may help you: Indirect Feedback Compensation of CMOS Op-Amps, R. Jacob Baker


Best regards!

 

[yschuang]

I want to add one reminder.

For folded cascode, nmos input pair has a better input gm but poor PM due to the 2nd pole caused by pmos load.

 

[wael_wael]

thats right, usualy nmos have higher PM, gain. if ur first stage with nmos, so the second stage is PMOS
best regards