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Recent content by iexplorer

  1. I

    Can ADS hold loop stability simulation?

    Hi, Can ADS simulator do a loop stability simulation like spectre stb? Thanks!
  2. I

    subthreshold n factor

    Does anyone know if the subthreshold n factor in (I=It exp((VGS-VTH)/(nVT))) has large variation with process corner and temperature? And also is the n factor the same in parasitic BJT current equation? Thanks!
  3. I

    How to test analog signal

    I wonder how to get a analog point 's waveform without bring parasite component from pad?
  4. I

    [Question]How to shut down a buffer?

    you may use C2MOS
  5. I

    CMOS comparator for sigma delta ADC

    comparator sigma delta really? I think comparator nonlinearity is a key issue in sigma delta design, because it can not be attenuated by loop, is itn't
  6. I

    noise analysis of delta-sigma modulator

    quantization noise can get from FFT with trans sim, but you can't get others such as thermal noise , 1/f noise since the average to time is zero
  7. I

    How to simulate switch capacitor circuit in ADS

    Thanks khouly I have tried this before,but still have some problem , when you do FFT with trans sim, you get the output spectrum with center freq and harmonics, so you can only get voltage or power of one point frequency , I wonder if there is some way to get the steady state and do AC sim ?
  8. I

    How to simulate switch capacitor circuit in ADS

    Thanks,LvW use CT subsitute is a good idea, but unfortunately, we can not get some second order effect such as charge inject or parasite in our simulation , it's not very convenient for performance improve,isn't it?
  9. I

    How to simulate switch capacitor circuit in ADS

    But how can I get the frequency response in tran? Could u please explain that in details, thanks
  10. I

    How to simulate switch capacitor circuit in ADS

    I wonder how to simulate switch capacitor circuit such as SC filter 's frequency response in ADS , in cadence I can use PSS and PXF , but how can I do it in ADS?Does anyone know it ? Thanks very much!
  11. I

    How to add termo noise to ADC output FFT?

    thanks jiangxb, how can I define the range of the time-domain random number? Need I to calculate the opamp noise and transfer it to effect of digital output?
  12. I

    How to add termo noise to ADC output FFT?

    thermal noise in adc since trans. simulation in cadence would not show the effect of thermal noise such as opamp , How can I add it in the ADC output 's FFT ?
  13. I

    question about switch

    would not cause problems like latch up ?
  14. I

    question about switch

    if I use triple well technology , can I connect source and bulk to improve linearity?
  15. I

    Does MDAC feedback path need bootstrap switch too?

    I use bootstrap switch in sampling phase to improve linearity of MDAC , I cann't determine whether need I to adopt bootstrap switch in holding phase ?Thanks
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