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Recent content by aaronwlee

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    Making liquid solution with known permitivity, conductivity?

    how do you make a conductivity solution? Thanks FvM Are you saying this is a research topic? Aaron
  2. A

    Making liquid solution with known permitivity, conductivity?

    making conductivity standards Hi all How to make a liquid solution with known permitivity, permeability and conductivity at cerntain frequencies. Is there any recipe for this purpose? Thanks Aaron
  3. A

    How to make liquid solution with know permitivity,conductivi

    Hi all How to make a liquid solution with known permitivity, permeability and conductivity at cerntain frequencies. Is there any recipe for this purpose? Thanks Aaron
  4. A

    How to make a liquid with known permitivity, conductivity

    conductivity and 16452a Hi all How to make a liquid solution with known permitivity, permeability and conductivity at cerntain frequencies. Is there any recipe for this purpose? Thanks Aaron
  5. A

    Question on simulation warning

    When I run the transient simulation of my design in Cadence, I get a warning : the value of "ikf" should be nozero ignored I am going to tapeout this chip quite soon and does this warning matters? Thanks Aaron
  6. A

    What IC structure can I use to design temperatur sensor?

    Thank you guys. Aaron
  7. A

    What IC structure can I use to design temperatur sensor?

    Hi All Right now, I am considering to desing an IC which could sense the temperature. I only have access to common process like TSMC 0.18, thus I can only use techniques within the chip. Can you give me some suggestion? Thanks Aaron
  8. A

    Need a positive feedback circuit design

    yes, in fact the specified number of the threshold is 100mV if there is some circuit more than positive feedback that will be nice The reson why I mentioned positive feedback is that this kind of circuit would generate very large current in a short time, which would help to discharge
  9. A

    Need a positive feedback circuit design

    positive feedback circuit Hi all, I need a positive feedback circuit design, the application is like this : Monitor the voltage of one specified point (this point could be modeled as a capacitor) if the voltage of this point goes beyond a threshold (about 100mV) , the positive feedback...
  10. A

    Any gentleman can help me to do a full-customized atenna

    Hi all My research lab needs a low profile implantable antenna. Right now, we just have some vague specs 1) MICS /UWB/ ISM/ WLAN ALL THESE BANDS are acceptable to us (my concern is if you choose higher frequencies, probably you will get more difficulties ) 2) low profile: at most...
  11. A

    lvs problem with calibre

    thank these two gentlemen Aaron
  12. A

    lvs problem with calibre

    Right now, I am doing the lvs of my circuit and layout and I always get error: in the schematic, the circuit has 3 pins and in the layout, I also create 3 pins and their labels but when I do the lvs, I get the error "different number of ports in layout and schematic" which means that calibre...
  13. A

    will my circuit oscillate ?

    Sorry to bother you all I did the close loop AC simulation of the gain and phase vs frequency (unity gain buffer connection of my OPAMP) and i put them in the attached can you help me confirm is it OK? In fact, I do not quite understand how to judge the stability directly from the close...
  14. A

    will my circuit oscillate ?

    thanks 1 do both close and open loop ac analysis for PM and GM for open loop case, I draw the gain vs frequency and phase vs frequency curves and find the phase of the frequency at which the gain is unity, then PM=180 - that phase, but what about the close loop method ? can you...
  15. A

    will my circuit oscillate ?

    thanks well, in fact, if taking the process variation or other uncertainty into account, I just want to know whether is it risky to fabricate this circuit into a chip, in real tape out, maybe the circuit would have a larger ripple and longer settling or even oscillation Aaron
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