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  1. LvW

    Op Amp Stability

    Thank you - normally, I also have a sense of humour;)
  2. LvW

    Current Mirrors

    Quote Arouse1973: "At last I have found someone that agrees with me, transistors being voltage controlled devices. " You have found another one: That´s me! Quote Steve: The first rule of voltage control of transistors is "Never mention that transistors are voltage controlled". There are 2...
  3. LvW

    Op Amp Stability

    Hi Steve - thank you. Regarding your suggestion, I think I have provided - in some cases - already a "rewording" in my pdf-attachement (starting with "Better:").
  4. LvW

    Op Amp Stability

    Adam - is that ironic?
  5. LvW

    Op Amp Stability

    Fine. And it would be a good idea to use captions with the figures which indicate what is shown.
  6. LvW

    Op Amp Stability

    I like to add three general comments: 1.) I agree, of course, to Steve´s comments regarding the correct writing of mathematical formulas. 2.) For my opinion, a contribution dealing exclusively with stability aspects should mention at the beginning Nyquist´s stability criterion, which all the...
  7. LvW

    Op Amp Stability

    Hi Adam, As you will remember, I gave you already some comments to your contribution on "opamp stability" (see, for example, my reply#8). Of course, you are free to implement my comments or not (for example regarding noise gain and loop gain definition). As mentioned already, I have discovered...
  8. LvW

    Op Amp Stability

    Hi Adam - by accident I have discoverd that you have updated the text and the pictures. I will go through it and give some comments (if any) later, OK?
  9. LvW

    RLC circuit question

    Did you consider that Zl and Zc are imaginary quantitties? Thus, the whole denominator is complex (magnitude and phase).
  10. LvW

    RLC circuit question

    In case the question asks for the steady-state response (that means: not for the switch-on transient) we have a just a complex voltage divider.
  11. LvW

    cmos inverter

    But can we describe (define) a "perfect woman"?
  12. LvW

    buffer circuit before rlc

    Three times: No! I wouldn´t. In any case I would say: The VOLTAGE provided by the battery is the source (better: is the cause) of current.
  13. LvW

    buffer circuit before rlc

    Yes, of course - mathematically!. But - as you see - I had good reason in my last reply to use the comment "physically spoken". For my opinion, something like a current source can be, of course, defined and matheatically treated a such. However, it was my only intention to point to the fact...
  14. LvW

    Op Amp Stability

    Hi Adam, please excuse me - but I think, your answer is a good example for the confusion which does exist regarding the term "noise gain". To make it clear : I do NOT disagree. Of course, noise gain is important for stability because it is nothing else than the reciprocal of the feedback...
  15. LvW

    buffer circuit before rlc

    Harald - I agree to all of your explanations regarding the voltage source. As far as the term "current source" is concerned: This leads to the question if - physically spoken - such a thing like a "current source" really does exist. For my opinion, it is just a wording to describe a voltage...
  16. LvW

    Op Amp Stability

    Ohh yes - I know a lot of contributions from the late Bob Pease - however, I must admit that I do not like all of them. And the present article about noise gain is such a contribution which - according to my experience - can cause a lot of confusions. Every thing in the article is correct - but...
  17. LvW

    buffer circuit before rlc

    Harald - may I ask you: What is the difference? For my opinion, it is not a "source of current" but a (nearly) constant voltage source. And such a source can, of course, allow a current, which however is determined by the connected load only.
  18. LvW

    oscillator circuit

    Yes - there are two feedback paths - however, the path with the crystal acts as a NEGATIVE feedback (because base and collector are in anti-phase). Therefore, my understanding is as follows: Positive feedback via C2 establishes the oscillation condition (but not "very sharp" at the desired...
  19. LvW

    Op Amp Stability

    I am not sure if it is a good suggestion to communicate via PM because other forum members should be able to participate, I think. What kind of "compromise" are you speaking of (in case of right or wrong)? Here are my simulation results for the phase margin (feedback via 10k-1k): *Crossover...
  20. LvW

    Op Amp Stability

    Hi Adam, * Are you aware that Fig. 6 (and its evaluation) is still wrong ? The blue curve still exceeds the open-loop gain. * Did you intentionally change the feedback network for Fig. 8 (1k feedback resistor) ? Now you compare the phase margins for two different circuits (gain of 20 dB and 0...
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