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meysam_abbasinia
Joined: 14 Aug 2007
Posts: 34
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 24 Oct 2008 10:52 need a rail to rail opamp design |
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hi,
i need a low power rail to rail opamp with max 200 MHZ BW.
i work in 0.35um and simulate with HSPICE 49 level CMOS.
let design it.
thanks.
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drDOC
Joined: 17 Jul 2008
Posts: 57
Helped: 7
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30 Oct 2008 11:25 need a rail to rail opamp design |
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So what is your question?
It sounds doable. But challenging to optimize the power/bandwidth ratio.
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meysam_abbasinia
Joined: 14 Aug 2007
Posts: 34
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31 Oct 2008 9:19 Re: need a rail to rail opamp design |
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hi,
I need it for a adder and applications like that, this should work full range 0~3.3v
50db or lower gain is suitable and 200Mhz BW is ok for this application,
folded cascode is not suitable because it's bad pole and don't work in that frequency i think!
I want structure of this opamp.
thanks.
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31 Oct 2008 9:19 Ads |
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drDOC
Joined: 17 Jul 2008
Posts: 57
Helped: 7
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31 Oct 2008 15:01 Re: need a rail to rail opamp design |
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| Quote: |
| folded cascode is not suitable because it's bad pole and don't work in that frequency i think! |
Have you tried it? I have witnessed a 115MHz unity gain bandwidth in 0.7um.
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meysam_abbasinia
Joined: 14 Aug 2007
Posts: 34
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31 Oct 2008 15:44 Re: need a rail to rail opamp design |
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Can I see your circuit with W/L of Transistors?
another question is about rail to rail. what should I do for this task? because folded cascod have above 2ΔV and from lower 2ΔV offset.
We should use inverter in output??
I'll very glad if send me your circuit.
thank you .
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