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Need information about designing CMOS OPAMP in 0,35 µm technology

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sykab

sykab

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Hi!

I’m trying to design, in Cadence, a single-ended CMOS AMPOP in technology 0,35 µm with a Bandwidth of 100MHZ. I'm thinking to design a simple OTA but I haven't decided yet.
I would like to ask if someone can give me or advice me some kind of information/book to help me:?:


Thanks
 

Re: CMOS OPAMP 0,35 µm

go for telescopic cascode structure followed by a class AB buffer if you want to drive heavy cap loads and low resistive loads, and also swing.

Telescopic would be more efficient than a folded cascode.

all the best
 

    sykab

    sykab

    Points: 2
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Re: CMOS OPAMP 0,35 µm

It is up to the load and your application. Cascode OTA is a good choice, but OPAMP can also be designed. Just use two stage.
 

    sykab

    sykab

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Re: CMOS OPAMP 0,35 µm

jecyhale said:
It is up to the load and your application. Cascode OTA is a good choice, but OPAMP can also be designed. Just use two stage.
Click to expand...

I want to do a current source which specifications can be seen in the image.

73_1209293258.jpg


Thanks for your reply. :D
 

Re: CMOS OPAMP 0,35 µm

i advice u first stage folded cascode (PMOS as input) and second stage is CS (sure NMOS the input), this circuit gives u low in settling time and high gain with phase margin
regards
 

    sykab

    sykab

    Points: 2
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Re: CMOS OPAMP 0,35 µm

wael_wael said:
i advice u first stage folded cascode (PMOS as input) and second stage is CS (sure NMOS the input), this circuit gives u low in settling time and high gain with phase margin
regards
Click to expand...

What's the meaning of "CS".

Thanks for you reply
 

CMOS OPAMP 0,35 µm

CS maybe is common source amp.
But the Bandwidth of 100MHZ is too large. Is it the unit gain bandwidth, but not the -3dB bandwidth.
I think it is hard to design an OTA with 100MHZ -3dB bandwidth. It will need a very large bias current to get a large gm.

Best regards!
 

    sykab

    sykab

    Points: 2
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Re: CMOS OPAMP 0,35 µm

gaom9 said:
CS maybe is common source amp.
But the Bandwidth of 100MHZ is too large. Is it the unit gain bandwidth, but not the -3dB bandwidth.
I think it is hard to design an OTA with 100MHZ -3dB bandwidth. It will need a very large bias current to get a large gm.

Best regards!
Click to expand...

Yes, CS should be common source... it makes sense.

Thanks.
 

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