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Recent content by cnm

  1. C

    spar with complex port impedance

    what can be expected for two-port spar with the two complex port impedances as complex numbers and also not equal? Anyone ever run into this situation and got any comments?
  2. C

    dual transistor gate

    Thank you Goldsmith --mixer then (or multiplier in time domain).
  3. C

    dual transistor gate

    Thank you, Goldsmith. How does it work when one use dual gate as multiplier or divider? Dual gate devices were used widely at microwave frequencies (for amp and mixers), although I haven't found any free articles online yet. Anyone who has those care to post a few? I am still trying to...
  4. C

    dual transistor gate

    Sounds like cascade amp is prone to oscillate with parasitics. Any comments from the device level on why dual gate is better?
  5. C

    dual transistor gate

    Why is the isolation better than two discrete ones? Thank you for the comments!
  6. C

    dual transistor gate

    Cool! What are the differences between using two discrete ones vs.one dual gate?
  7. C

    dual transistor gate

    what are the advantages of using dual gate FET for amplifiers? any comments/insights are much appreciated.
  8. C

    Script for differential to single ended s parameter conversion

    here is the one I referred to
  9. C

    Script for differential to single ended s parameter conversion

    There is an Agilent note on this that you can google I remember. If you can't find, please let me know.
  10. C

    transmission line Q calculation

    I thought adding loss free line section will change the resonator frequency. The Q derived is for the new resonance frequency, rather than at the orginal line section's resonance frequency? To get RC=0, the real impedance has to be equal to the external impedance (for example 50 ohm for meas...
  11. C

    transmission line Q calculation

    Thank you very much for your comments! This is the 45 deg impedance angle point. why 45 deg has to be used here? What is RC? Is it the resistance at resonance frequency? if it equals zero, wouldn't Q be infinite?
  12. C

    matching between differential ports to differential ports

    BigBoss, thank you for the insightful and helpful comments! For the reserve problem, to find differential impedance from known single-ended impedances, your comments seem to suggest that, one can just use Z_diff=2*(Z_single1)? (where Z_single1, Z_single2 are the impedances for two single-ended...
  13. C

    matching between differential ports to differential ports

    How is the matching carried out from one different port to another differential port? For example, matching between output of balun (differential port) to another differential port (such as differential amp, or balanced antenna)? Any suggestions or comments are very much appreciated.
  14. C

    transmission line Q calculation

    Thanks Rodger. The Wiki page provides the general idea. It seems that Sonnet does not provide Q calculation for TRL. However, it has built-in Q equation features for lumped components.
  15. C

    How to simulate the unloaded Q of a cavity resonator using HFSS?

    Re: Cavity Resonator Design Reducing coupling will give you a more accurrate answer.
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