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  1. Closed: Re: Problem in saving data during DC sweep simulation in Cadence Virtuoso

    Dear Pancho,

    The parametric has no problem, it is well working, but I am asking why the simulation fail to present data in grpah if I do the sweep from DC ?

    - - - Updated - - -

    See the image...
  2. Closed: Re: Problem in saving data during DC sweep simulation in Cadence Virtuoso

    Dear Suta,
    my supervisor suggested me not to include transient analyses to sweep the VIC, because transient simulation first it takes time and second it shows time behavoural of the circuit which...
  3. Closed: Problem in saving data during DC sweep simulation in Cadence Virtuoso

    Dear friends,

    I am trying to plot the GBW of my amplifiier under the whole range of the input common mode voltage (VIC). Therefore I run both the DC and AC analyses in the same time, I sweep the...
  4. Closed: Re: Transistor region of operation in operational amplifier

    Thank you for your answer Suta, I tried your method and it is working. I can confirm from your graph ans mine that weak inversion starts usually at VGS-vth=Vov in negative,, so the concept of Vov=...
  5. Closed: Re: Transistor region of operation in operational amplifier

    Dear Suta,

    Thank you very much for your reply

    you are right, I also found this slide from Allen, the region where gm saturated is the weak inversion region,

    155952

    in my gm/ID result...
  6. Closed: Re: Transistor region of operation in operational amplifier

    Dear Suta,

    I am very sincerely grateful to your help, always you have perfect solutions..

    Your trick is magically works,

    below you see the results


    155943
  7. Closed: Re: Transistor region of operation in operational amplifier

    Dear Suta,

    Thank you for your nice reply

    Can you please explain me how to creat saveop.scs file ?

    Thank you once again for your help
  8. Closed: Re: Transistor region of operation in operational amplifier

    Indeed Suta I have tried to plot gm/ID but the claculator was giving me multiple graphs rather than one, this due to that I swept the VGS from the parametric analyses not by DC simulation setup,
    ...
  9. Closed: Re: Transistor region of operation in operational amplifier

    Dear Suta,

    I did this simulation for one NMOS transistor, it has the following parameter from normal circuit run
    W/L = 40 um/1m
    VDS= 153.8 mV
    VGS= 610.3 mV

    In cadence I could verify it is...
  10. [SOLVED]Closed: Re: Common mode gain simulation for differential amplifier using balun

    Dear Erikl,

    Thank you for your reply

    I think I did two mistakes, first in my plot, the output balun should be Bo and the the input balun is B1.

    The second mistake is about the difinition of...
  11. Closed: Re: Transistor region of operation in operational amplifier

    Dear Suta, Thank you for reply

    I think you are suggesting me to use the gm/Id methodlogy, Right ?... for me I am desinging with 0.35 µm technology and therefore I am following the traditional...
  12. Closed: Re: Transistor region of operation in operational amplifier

    Dear Suta,

    Thank you very much for your nice explanation,

    The method you propose it is interesting, I will keep it in mind to do.... nevertheless Cadence provide an operating region like region...
  13. Closed: Re: Input referred noise simulation for OP-amp

    Desr friends,

    Thank you for your reply

    I think in the picture from Allen slides he missed to put the ac source on the plus_input.

    Dear Fvm, For sure working with high gain open loop is not...
  14. Closed: Input referred noise simulation for OP-amp

    Dear friends,

    When I want to simulate the input referred noise of the op-amp, should I perform the test under open loop condition or under closed loop condition with unity gain buffer for example...
  15. Closed: Transistor region of operation in operational amplifier

    Dear friends,

    In the early steps of designign the op-amp is to select the appropreiate value of overdrive voltage (Vov = Vgs-vth) to meet different criteria (ICMR, OCMR, ...etc)

    in the Jakob...
  16. Closed: Re: Overdrive voltage relationship to the op-amp speed

    Dear friends,

    Thank you for your helpful discussion,

    I can understand now that increasing gm by increasing the current is different from increasing it by increasing W/L. The first method...
  17. Closed: Overdrive voltage relationship to the op-amp speed

    Dear friends,

    In the Jakob book he discussed about selecting the suitable value of the overdrive voltage of the transistors in the operational amplifier. for long channel he is using Vov = 250...
  18. Closed: Speed relationship to the operational amplifier speed

    Dear friends,

    it is know that shorter channel transistor is faster than with longer gate. This I can understand well when we talk about NOSFET working as a switch.

    But how this concept affect...
  19. Closed: Re: Design consideration of CMOS anti aliasing filter

    Thank you FvM for you nice answer, I am sencierely garteful to your continous support,
    I need to have a look on your answer before I go in further discussion

    Thank you once again
  20. Closed: Re: -3db frequency of the op-amp open loop gain

    Dear Vivekroy

    So for closed loop, GBW is the important parameter which also has an impact on the settling time of closed loop feedback, which beside the slew rate affect the speed of the op-amp
    ...
  21. Closed: Design consideration of CMOS anti aliasing filter

    Dear friends,

    I am starting with the design of a fully differential anti aliasing filter,
    my maximum input signal bandwidth is 5 MHz.

    I never worked with filter design,

    1. it will be...
  22. Replies
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    233

    [SOLVED]Closed: Single or dual supply operation

    Dear friends,

    Will be any difference in op-amp peerformance and characteristics if I use to connect it with single supply operation or dual supply ?
    I am using the 3.3 V CMOS technology in my...
  23. [SOLVED]Closed: Re: Connecting the load to VCM or to ground in single supply operation

    Dear Klaus

    Thank you for your reply

    I need to use the op-amp as a general purpose amplifier, say for example I want to connect it as an inverting amplifier.

    Do you mean by unipolar that I...
  24. Closed: Re: -3db frequency of the op-amp open loop gain

    Dear FvM

    Thank you for your reply

    It means that the dominant pole (which represent the -3 dB frequency in the open loop) has no effect for circuit performance for example speed and settling time
  25. Closed: -3db frequency of the op-amp open loop gain

    Dear friends,

    What is the importance of the -3 dB freuquency in the open loop charasterics of the operational amplifier. We mostly are design to satisfy the GBW value then f-3dB just comes as a...
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