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Recent content by iiiiisland

  1. I

    Ask help for corners simulation in cadence spectre

    Thank you! Newmedia I know what you mean to tell, but in my situation the bar which shows commands like Add Corner, Add Variable, Copy Corner etc. is gray. I cannot do any simulation. So I am puzzle if I missed some setup files and the .cdsinit file doesn't do any customization. Besides, I want...
  2. I

    Ask help for corners simulation in cadence spectre

    AdvaRes and newmedia, Thank you! The problem is I can do ss ff etc. simulation if I change the items under model libraries frequently. I want to do the corners simulation under the tools item in ADE Cadence because I want to see the results of different corners simulation in one time. I...
  3. I

    Ask help for corners simulation in cadence spectre

    Hello, I want to use corners to simulate circuit in different technics, like tt,ff,ss,etc. But many items under the corner window is dark, which means there are some file unsetup, I guess. Is there any body know such situation? what files I need to setup in spectre before I run corners...
  4. I

    some question about sar adc

    thank ashish_chauhan for your advice! you said to shorten the input and output of the comparator to eliminate offset. but my comparator is a combination of a preamp and a latch. whether should i shorten the output of the preamp or the output of the latch to the input end ? thank you
  5. I

    some question about sar adc

    hi i generally have two questions about a 10bit sar adc 1. is offset cancellation essential when designing the comparator of the adc using the archetecture of a preamp with latch? 2. is it need trimming or calibration to design a 10bit sar adc? if the offset of the...
  6. I

    Gain boosting circuit design

    the CMFB is taken in fullly differential amplifier in order to make it work in a stable state. otherwise the commom working point will be drifting .
  7. I

    control logic for SAR ADC

    digital sar logic thank you! I am also designing a 10 bit sar adc. How to eliminate the offset of the comparator is the biggest problem for me as well as the accuracy problem. the simulation results show the error is a little less than 1mv, but it have not contain the offset effect...
  8. I

    how fast can sigma delta ADC performance?

    I hear C-T sigma-delta can acheive a fast convertion rate larger than 25M, are there some data to support it ? thank you!
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