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Recent content by blue2lucy

  1. B

    fully differential buffer?

    Thank you. That's also what I've done before. But that's not a good buffer - the input resistance actully lower than that of the single ended version (non-inverting).
  2. B

    fully differential buffer?

    For a fully dif op amp, aka 2 inputs and 2 outputs, apparently we can't directly connect the inputs and outputs (with opposite palarity) together to form a buffer. Then what is the best way to impement a fully differential buffer? What I can think of is resistor feedback configuration with gain...
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    thermal noise distribution

    Amplitude distribution of thermal noise is Gaussian and its frequency spectrum is white.
  4. B

    thermal noise distribution

    Thank you, but that's not an answer. You just repeated the statement I've made.
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    thermal noise distribution

    A bit confused by the thermal noise spectrum: people say thermal noise is white, i.e., it has same amplitude (power) through the whole frequency spectrum. But it's also said that thermal noise has Gaussian distribution. Isn't this a conflict? Thanks for clarifying this issue.
  6. B

    Current to voltage converter

    My suggestion is to check the application notes. There's a great deal of information there.
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    Determining parameters from BSIM model

    equation for rsh and rdsw In theory you sure can, but that's not the best way. The easy and reliable way is to run a simple simulation then derive kn, kp. By the way, cox' is easy to calculate - you know how.
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    Where do the harmonics come from in OpAmps?

    Re: Harmonics You really should go over some basic concepts before you post an "answer" for others.
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    Plot Gm/Id in Cadence Spectre?

    cadence plot gm That sure works. You just didn't do it right. "Save all" will cost a lot of disk space though. So the best way is to include the "save" command in a seperate file (if you are running simulation in ADE). In fact this can be done easily from the command line. Use Specrre -h or...
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    Will PLL duplicate a weak signal at the output properly?

    Re: about pll Please understand how PLL works first before you go any further.
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    how to build a bandgap with 2-3V supply

    There are plenty of books/papers available on this topic. The best way to learn it is to the classics books, understand the concept and do some design simulation. If you have specific difficulty or qeustions, then come to ask here. I just feel sometimes people are tyring to find a short cut...
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    Is it possible to simulate DNL and INL for a 10-12bit ADC?

    Re: Simulate DNL and INL This should be readily avaiable.
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    early effect voltage in current mirror

    The simplest solution would be cascoded current mirrror.
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    Plot Gm/Id in Cadence Spectre?

    how to plot gm You can save all operating points or specify to save gm. Then plot it with waveform.
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    Is it fisible to simulate in PSpice the program of a uC?

    Re: Is it fisible to simulate in PSpice the program of a uC I think functional verification is doable. At transistor level, it's not feasible.
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