Search:

Type: Posts; User: FvM

Page 1 of 20 1 2 3 4

Search: Search took 0.21 seconds; generated 27 minute(s) ago.

  1. Closed: Re: Higher Current Consumption than expected with AFE and embedded Flash

    Hard to give less information…

    Where do you see the current peak and when? You should be able to trace the current path down to the component generating the peak.
  2. Closed: Re: Suppressing the spacing in $fwrite command of Verilog

    Review System Verilog language reference, paragraph 21.2.1.3 Size of displayed data.

    It's regular C format specifier syntax, by the way.
  3. Replies
    26
    Views
    679

    [SOLVED]Closed: Re: IGBT Overshoot and Weird Slope

    It depends. Some thermal pastes with high thermal conductivity are metal filled and also electrically conductive. But as far as I can see from the photo you have separate heat sinks for each IGBT. So...
  4. Replies
    2
    Views
    121

    [SOLVED]Closed: Re: AMS simulation of D-FF

    There's no clock signal fed to your circuit, respectively output is uninitialized..

    Confusingly you are providing a multi level ("electrical") signal to the D input which makes no sense for a...
  5. Replies
    8
    Views
    363

    Closed: Re: Antenna pcb in commercial key fob

    The order of magnitude sounds reasonable. Obviously the numbers have been empirically validated, but your antenna geometry may be different.

    You can try different inductance values and measure the...
  6. Replies
    26
    Views
    679

    [SOLVED]Closed: Re: IGBT Overshoot and Weird Slope

    Adjustment is either at the probe or the probe connector. Why don't you read the manual?
  7. Closed: Re: Is there possibility to force a filter topology in DA_LClowpassMatch in ADS?

    frdm90 didn't yet release a matching bandwidth specification. I presume, it's not possible to achieve a higher bandwidth with LC network for the example matching problem.
  8. Replies
    26
    Views
    679

    [SOLVED]Closed: Re: IGBT Overshoot and Weird Slope

    Besides unsuitable probe connection it may be dropping DC supply. I won't care about it much. Overshoot is much more a problem. It probably kills the IGBTs if you connect high input voltage.

    To...
  9. Replies
    26
    Views
    679

    [SOLVED]Closed: Re: IGBT Overshoot and Weird Slope

    How can you measure with different ground connection for blue and yellow trace simultaneously? The real circuit must be somehow different.

    - - - Updated - - -


    Disconnecting the...
  10. Replies
    26
    Views
    679

    [SOLVED]Closed: Re: IGBT Overshoot and Weird Slope

    No. I referred to the isolation capacitance, e.g. the transformer interwinding capacitance. The linear voltage regulator circuit is O.K. But it's not so good to have the power supply and transformer...
  11. Replies
    14
    Views
    2,110

    Closed: Re: SRF of filter inductors in offline SMPS

    O.K., you can tune a diff mode filter to reject a particular frequency, at cost of wideband suppression. If it helped in a special case, it's surely no reasonable general suggestion.
  12. Replies
    26
    Views
    679

    [SOLVED]Closed: Re: IGBT Overshoot and Weird Slope

    There's no DC bus in a "direct converter", which constitutes already some of the circuit problems.

    It's not clear where you measure the "IGBT output". Why we see a negative pulse although the...
  13. Replies
    14
    Views
    2,110

    Closed: Re: SRF of filter inductors in offline SMPS

    Part of your points have been already discussed in the previous thread.


    Surely not. A choke has maximal impedance at it's SRF, respectively maximal isolation of the interfering frequency.

    100...
  14. Closed: Re: Problem adding reset to master slave D-FF for phase detector

    I don't understand what you consider "wrong" in the posted simulation waveforms. I don't recognize missing pulses or similar artefacts. Please clarify where exactly you see a problem.

    I presume...
  15. Replies
    16
    Views
    534

    Closed: Re: Extracting energy from gyroscope precession

    Sure, but the problem is at least of theoretical interest. Kajunbee's empirical observation that braking the precession slows down the gyro rotation can be substantiated by the theory of gyroscopic...
  16. Closed: Re: Problem adding reset to master slave D-FF for phase detector

    What did you observe?
  17. Replies
    1
    Views
    165

    Closed: Re: Ultrasound Transmitter

    Why do you think the number of transition could be limited in off-chip mode?
  18. Replies
    3
    Views
    207

    Closed: Re: would iron wire block high frequencies

    Ferromagnetic materials are bad conductors for high frequent AC. Not due to "hysteresis" but due to effect of permeability on skin depth. See e.g. https://en.m.wikipedia.org/wiki/Skin_effect
  19. Replies
    8
    Views
    363

    Closed: Re: Antenna pcb in commercial key fob

    You'll determine the antenna impedance by measurement or simulation, then design the matching circuit.
  20. Closed: Re: Why does I2C Expander reply with NAK when master sends a byte?

    Slave can block I2C bus by pulling SDA low (or SCL, if it has an an SCL driver). Did you check?
  21. Replies
    8
    Views
    363

    Closed: Re: Antenna pcb in commercial key fob

    Nothing special, a short (< λ/4) folded monopole, tuned with series inductor L2. Small bandwidth, high Q, not very efficient.

    Can be used at different frequencies (434 or 915 MHz) bei changing...
  22. Closed: Re: Flyback SMPS power MOSFET getting hot? uc3843 pwm converter

    This explains a lot. Operating a flyback transformer with no air gap is a safe way to saturate the core.

    Without an oscilloscope, you can't debug circuit operation. There's a certain chance that...
  23. Closed: Re: Which component can be a 2W LTE amplifier at 900Mhz?

    You can upload any kind of simulation files after zipping it.
  24. Replies
    6
    Views
    310

    Closed: Re: Integrated planar transformer

    Although the app note suggests not to apply epoxy resin to the core gap, I usually do to achieve highest strength. As far as I'm aware of, most transformer manufacturers also go this way. I prefer a...
  25. Replies
    6
    Views
    318

    Closed: Re: What Signal is this?

    No, it can't.
Results 1 to 25 of 492
Page 1 of 20 1 2 3 4