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Recent content by cmos_ajay

  1. C

    dynamic trimming in a mismatch simulation

    Hello Dominik, Can you please explain the usage of the function Calcval ?
  2. C

    dynamic trimming in a mismatch simulation

    I am running a mismatch analysis in Cadence and measuring a 10uA current. This 10uA current can be trimmed. I would like to change the trim code of the current for every iteration when I am running a mismatch analysis. In simple words, I want to measure the current, trim it to its target value...
  3. C

    modeling a PWL source in Verilog A

    Hello, I would like to model a PWL source using Verilog A . How can I do that ?
  4. C

    sizing of floating current sources in folded cascode amplifier ?

    I agree with your suggestions. If I am using a 0.18um process, what should be the typical length of mosfets MP8 and MN6 ?? Can they be replaced by a resistor ??
  5. C

    sizing of floating current sources in folded cascode amplifier ?

    The attached picture shows a folded cascode amplifier with class AB o/p stage. * How should I select the W/L of the mosfets MP7, MN5, MP8 and MN6 ? * Suppose this amplifier architecture has a fully differential o/p. Assume that only the tail current PMOS source Ib1 , input diff pair devices...
  6. C

    [SOLVED] Switch size in a resistive trim network ?

    In your reply you said " select only the top device, switch off the lower ones". Does it mean turn ON the topmost NMOS switch M1 and turn OFF all the switches below it ? Also "set Ron at least 10 times smaller than R" . For the trim network 2 in the picture, should I place the lowest...
  7. C

    [SOLVED] Switch size in a resistive trim network ?

    The picture shows resistive trim networks. I am using a 0.18um CMOS process. How should I choose the NMOS switch size (W/L) for the resistive network 1 and 2 ? What criteria decides the required ON resistance for the NMOS switches ?
  8. C

    [SOLVED] Ocean script plot - changing axis labels ??

    can you tell me the correct arguments ?
  9. C

    [SOLVED] Ocean script plot - changing axis labels ??

    I used the command ocnYvsYplot(?wavex Vds ?wavey Id awvSetXAxisLabel("Vds") awvSetYAxisLabel("Id")) But I get an error. Can you tell me the correct format for the above ?
  10. C

    [SOLVED] Ocean script plot - changing axis labels ??

    I am running an ocean script in Cadence to plot expressions. The command I used was ocnYvsYplot(?wavex Vds ?wavey Id) The above command does not display axis labels Id and Vds. How can I see the axis labels ? What needs to be changed in the command for this ??
  11. C

    error running Ocean script in Cadence ?

    I am doing a DC sweep and not a transient analysis.
  12. C

    error running Ocean script in Cadence ?

    That does not answer my original question. I am not using the cross function at all. So the question of threshold value does not arise.
  13. C

    error running Ocean script in Cadence ?

    Hello, I get the following error while running an Ocean script from the CIW window I can run the simulation from the ADE L window and see the waveforms also. Can someone suggest a solution to this problem I face while running the ocean script ?
  14. C

    Stability of switch capacitor bandgap ?

    The bandgap in the attached photo has a feedback from the output. Obviously stability needs to be checked or it can show an output with oscillations. How do I determine the gain margin and phase margin of the system ? Can someone provide ideas for a test circuit to determine the stability...
  15. C

    Question - determining Flicker noise co-efficient for a process

    Can you show a test circuit and relevant SPICE commands , plots for the above ?
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