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Recent content by analogartist

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    Output resistance(ro) and Channel lenght modulation for short channel devices

    I am trying to understand the effect on channel length modulation (CLM) in short channel devices esp. the effect on output resistance. In Razavi chap 16 , there is an equation for calculation for ro based on which ro increases with Vds due to CLM. I assume velocity saturation is also taken into...
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    need ee214 standford lectures additional documents

    I am using the ee214 lecture notes for studying. I found that Prof.Murmann has additional notes provided like gm/ID, gm.Cgg lookup tables. I need those to understand his lectures. There are mentioned in pg.240 of his notes. " gm/ID, gm/Cgg lookup tables: Reference:C:\Documents and...
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    Relationship between Vdssat and Vov

    relation between vdsat and vds Ambreesh, Could you explain relation between gds ,vov(vgs-vth) and vdsat a little more. If i have a device which has vov>vdsat ( by 100mv) and vds>vov ( by 500mv) and the device is shown to be in saturation. what will looking at gds tell me? What is the...
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    How good are TANNER tools

    I once tried TANNER tools as a part of evaluation ....As every tool has a learning curve I had some trouble too.....but my understanding is it is maybe a bit faster than cadence tools.. as it doent have the GUI support of cadence.. and you can get things like monte carlo analysis within the...
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    Source follower pole-zero intutively?

    Zabihian, Thank u for your reply.. I am bit confused on what you meant by negative frequency... I got the same equation as you did -gm/cgs when I wrote the trasfer function. and since there was a negative(-ve) sign I understood it to be a LHS zero.. but am not sure on how a LHS zero will...
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    finding MOS kp(kn) value?

    retrieve nmos values k Thanks everyone. for all your feedback.... I did check the model file for the values.. but these were hidden in layers and layers of hierarchy set by the company... as analog_guru said.. I am working on 135n and less... and the values seem to vary crazily... so I...
  7. A

    finding MOS kp(kn) value?

    kp nmos Is there a reason for choosing larger area..?mismatch??
  8. A

    Source follower pole-zero intutively?

    source follower pole When trying to intutively understand how a zero occurs in a circuit... For any zero I am of the understanding that for a finite Vin ==> the ouput Vout(Sz) =0 [Sz being the freq of the zero.] Now, if I apply a signal at the input then In a common source stage...
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    finding MOS kp(kn) value?

    cox mos Hi all, This might sound silly to most designers here..... How can I find kp (or kn) for a MOS device... i.e Up*Cox(Un*Cox) (In school most projects I did mentioned this value ..so starting a design was easier .. but in industry... how is it done?)... thanks for your help
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    Why cant an OTA drive resistive loads..?

    Pixel, Does this mean .. if I connect a Rload>> Rout of the OTA then the gain of the circuit is gm*Rout and consequently through voltage divide of the load and Rout .. the Vout=gm*Rout*Vin This means an OTA can drive a Rload >> than its Rout? [
  11. A

    Why cant an OTA drive resistive loads..?

    why is that it has to be limited to capacitive loads... (large/small capacitive load)
  12. A

    How to simulate a startup circuit of a bandgap?

    start up circuit Any methods?
  13. A

    Is this a right approximation- for High speed opamps?

    Miguel, I am not sure if I got it right.. so here I am stating it again..... So what you are saying is the approximation is right for wo > 5Mhz? But otherwise is it primarily BW that is of concern not GBW Added after 26 seconds: Miguel, I am not sure if I got it right.. so here I am...
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    Is this a right approximation- for High speed opamps?

    Wondering what causes High speed in an opamp(closed loop).. I derived the step input for an closed loop single pole system to be V0(1-e(-wf)) where wf is the closed loop bandwidth= wo(1+βAo) where wo is open loop BW , Ao is open loop gain and β is feedback factor.. Is it good to...
  15. A

    High speed opamp -depends on GBW or BW?

    What is this link... goes to some foreign language website...?
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