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Recent content by coffeelox

  1. C

    INL and DNL test for ADC

    adc dnl you can record the output by using probe tool provided in Trans sim.
  2. C

    difference between database grid and manufacturing grid?

    manufacturing grid recently I noticed in my tech file, it stated as follows, 0.001 Database Grid (for 3rd party tools) 0.01 Manufacturing Grid size and snap spacing what's the difference between database grid and manufacturing grid? how can i set grid in layout then? thanks...
  3. C

    INL and DNL test for ADC

    inl and dnl I would like to know the answer as well. Now I am using sine wave as input. I am not sure if only using DC, the result is believable.
  4. C

    Is it ok to use the minimum length (i.e 0.18u) in analog?

    Re: Is it ok to use the minimum length (i.e 0.18u) in analog I guess you need to take care of contact size. if DRC requires contact size to be bigger than 0.18um, you cannot use minimum length.
  5. C

    problem with Cadence Virtuoso layout editor

    virtuoso snap spacing but we are using ubuntu for all kinds of techs such as 0.13um, 90nm, 65nm, etc... there is no problem on others, only in 0.13um, is there any settings in system files such as display.drf, .cds.init? BTW, which system are you using?
  6. C

    problem with Cadence Virtuoso layout editor

    virtuoso snap I tried gravity on, similar result, I cannot move to where I want, and with gravity on, I even cannot draw where I want. any other idea? thanks a lot! I use ubuntu, and the tool is provided called "recordmydesktop". nice tool...
  7. C

    problem with Cadence Virtuoso layout editor

    cadence virtuoso layout editor linux it doesn't work as well... please refer to the enclosed. Thanks a lot!
  8. C

    how to make reference voltage with use of resistor ladder

    Re: Reference Voltage if the resistor ladder is used for reference voltage, I did not see any timing issue as only DC, no AC on it. and once DC and gnd on both sides of resistor ladder, it's done then.
  9. C

    how to make reference voltage with use of resistor ladder

    Re: Reference Voltage my understanding is you have resistor string for resistor ladder, and from each node on resistor string, you have transistor connected as switch followed by large cap. I am thinking if you can try to increase resistors value in your resistor string.
  10. C

    problem with Cadence Virtuoso layout editor

    gravity in cadence I found now I can draw the shape anywhere, but I cannot move the shape anywhere. After I drew a rectangular, I only can move it to bigger snap spacing... Ex: X/Y snap spacing 0.02 minor spacing 0.01 major spacing 0.1 I can draw rectangular anywhere on the minor grid, but...
  11. C

    Noise Simulation in a fully differential Circuit

    simulating differential noise don't know if you have noise simulation in SpectreS?
  12. C

    PAC and AC analysis - request for manual

    what is pac analysis?? It might not be updated version. but it's helpful to answer your questions I guess.
  13. C

    simulation problem ic5141 but no error ??

    it seems like you did not set model file correctly or configuration problem in ADE.
  14. C

    spectre simulation error - "input.scs": unable to

    Re: Simulation error just guess... did you try to check the access right for your simulation folder? is it writable?

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