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LvW's latest activity

  • LvW
    LvW replied to the thread How to adjust phase margin in ADS.
    I am not familiar with ADS - however, using a universal simulation program like PSpice it is possible to adjust a certain part within a...
  • LvW
    LvW replied to the thread Stability Analysis of Opamp.
    Sorry for the typing error (1ßß%) - must be: 100% of course.
  • LvW
    LvW replied to the thread Stability Analysis of Opamp.
    Let me repeat again: The keypoint for the two alternatives for the stability criterion is the question: Is the necessary phase inversion...
  • LvW
    LvW replied to the thread Stability Analysis of Opamp.
    The stability criterion requires that at 0dB loop gain the phase must be still slightly negative (because for negative feedback the...
  • LvW
    LvW replied to the thread feedback mechanism.
    Yes - that`s how I have interpreted your wording. More than that, it is also interesting that even an ac analysis (simulation program)...
  • LvW
    LvW replied to the thread feedback mechanism.
    No - I don`t think so. A positive voltage at the inverting input causes a positive output. Is this logical? However - I can imagine...
  • LvW
    LvW replied to the thread feedback mechanism.
    Yefj - I recommed to study in detail the concept and the effects of/on negative feedback. For my opinion, it does not make much sense to...
  • LvW
    LvW replied to the thread Opamp -1 and +1 stable.
    1) Closed loop: The "spike" in the region of the pole frequency is called "frequency peaking". It is an indication for a phase margin...
  • LvW
    LvW replied to the thread Opamp -1 and +1 stable.
    I think that such a danger does not exist. The larger the feedback capacitor, the lower the "cross-over frequency" (with unity...
  • LvW
    LvW replied to the thread Opamp -1 and +1 stable.
    Klaus - I rather think that the effect of limited slew rate is caused by saturation of the opamps input stage - until the delayed...
  • LvW
    LvW replied to the thread Opamp -1 and +1 stable.
    The answer to your question was given already in post#10: "Both cases represent the most critical application as far as stability is...
  • LvW
    LvW replied to the thread Opamp -1 and +1 stable.
    The following comment is intended to avoid confusing the questioner with the different terminology and to clear up any...
  • LvW
    LvW replied to the thread Opamp -1 and +1 stable.
    1) It seems that you have applied a stabiliy criterion on the closed-loop gain response. That is not correct. Instead, the well-known...
  • LvW
    LvW replied to the thread Opamp -1 and +1 stable.
    Explanation: 1.) For a non-inverting amplifier with a closed-loop gain Acl=+1 the loop gain is identical to the opamps open-loop gain...
  • LvW
    LvW replied to the thread loop gain calcaluation question.
    Typing error? Rather, we require Zout<<Zfeedback for simplified Middlebrook method.
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