Type: Posts; User: dick_freebird

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  1. Replies

    Closed: Re: Induction Cooktop Circuit Design

    Your "core" is the pan and your secondary is the pan
    and the secondary "burden resistor" is the pan as
    well. As this is highly end-user-variable I'd think that
    attention should be paid to...
  2. Replies

    Closed: Re: Resistor Layout - Guard Ring

    If you were really keen on noise control you might put a
    well under it and then that feature would want its usual
    subfeatures and so on. Nwell does not have to be VDD-
    biased, it could be ground...
  3. Closed: Re: Why all the applied Voltage appears across the Depletion Region ?

    The N and P regions will conductivity-modulate at
    high injection (high being relative to the doping,
    lightly doped materials modulate a lot, usually a
    good thing unless you don't like storage...
  4. Closed: Re: Simulating the input capacitance of digital instance

    Use a vpulse with a finite, technology-appropriate rise
    and fall time, plot the current, C=I/(dV/dt) which you
    know from setting it.
  5. Closed: Re: Can IP(Intellectual Property) open source, what does good business model?

    Open source is about doing things that matter without the idea
    that you'll make money at it.

    Now a business superstructure does tend to enforce discipline
    and "finishing the job" while open...
  6. Replies

    Closed: Re: Mosfet equation: Qinv

    Qdepl is how much charge to negate the doping at the surface.
    That is a pretty straightforward thing.

    Qinv is the additional charge to then invert the same region,
    but how much? That's...
  7. Replies

    Closed: Re: on-resistance of a mosfet

    On-resistance is a DC parameter. At 100GHz you are looking
    for an on -impedance- which is a complex number, and it is also
    shunted at both ends (and the middle, if you care to get really
  8. Closed: Re: Why all the applied Voltage appears across the Depletion Region ?

    How? Because they define it so. That is, they say there's
    negligible current so I*R in the ohmic regions is to be neglected.

    Now outside academia there are many cases where ohmic resistance
  9. Closed: Re: Different isolation techniques used to isolate devices with different potential?

    Twin-well JI processes can give you isolated NMOS bodies.
    Other than that, SOI.
  10. Replies

    Closed: Re: Resistor Layout - Guard Ring

    Poly resistor has no substrate contact so there's no need
    for extra isolation measures for leakage. -Maybe- if you
    are extremely sensitive to substrate noise, but even that
    is pretty unlikely...
  11. Closed: Re: Output short circuit current of operational amplifier

    Read the datasheet carefully (and know how to interpret
    the way things are expressed).

    Some op amps (esp. older medium-voltage, 30V bipolar
    types) have explicit short circuit current limiting...
  12. Closed: Re: Desperate for help or this could cost me a huge amount of $$$

    So what would be the downside of just replacing the
    fan's power source with direct +12V, presuming these
    are the usual sort of brushless fan, only fed a controlled
    voltage? Noise, power...
  13. Closed: Re: CMOS FINFET Layout Tutorials/Explanations

    Well, by all means let me be the first to "Google it" for you.

    See? Easy and effective. You can do it. Yes you can.
  14. Replies

    Closed: Re: using a power inverter in a car

    I have not seen inverters complain about high input voltage,
    but have seen them act very badly at undervoltage. Fried a
    serial port on a tuning laptop when the inverter powering it,
    went into...
  15. Replies

    Closed: Re: NCSU FreePDK 15nm for Analog Design

    You're talking to a very small sliver of that kit's users
    (if indeed any), here.

    You can do analog design with any kit that provides
    SPICE models. How well, and why, is the question
    (is this...
  16. Closed: Re: Tools to detect AC electric leakage/loss in home electricity

    If you are concerned about battery excess charging then
    you need to know the proper charging voltage and see
    if it's exceeded. Lead-acid charge controllers that are
    "general purpose" (not...
  17. Closed: Re: Tools to detect AC electric leakage/loss in home electricity

    Sure. A clamp-on ammeter and your circuit breaker panel.
    You can see current in each branch by turning off all but
    one at a time, and follow the thread.

    Depending on your environment you might...
  18. Closed: Re: Illumination driver high speed power NMOS switch 10Mhz ~ 100MHz

    Different GaN offerings have different degrees of difficulty
    in driving. Cascode types like Transphorm get driven like
    a MOSFET because they are a MOSFET under a depletion
    mode GaN cascode FET....
  19. Closed: Re: What are the layout methods to make source to drain capacitance zero?

    The only things that makes zero capacitance are infinite distance
    or zero facing (+ fringing) area. Since you say you want a real
    thing, that eliminates the "zero area" option.

    Good luck with...
  20. Closed: Re: Why should a solder joint be less than 110degc?

    The way the Vishay word salad is packed, makes me think
    this is about thin film resistivity stability and/or trim stability.
    The criterion may not be failure but tolerance drift.
  21. Closed: Re: Modelling UC3842 current mode PWM Controller

    The Yahoo! LTSpice "Group" has a huge archive of contrib
    IC and discrete device models. It may take some digging.
  22. Replies

    Closed: Re: Pressure sensor 0-10bar?

    I have used Kavlico fuel pressure sensors for measuring fuel
    rail pressure in tuning EFI engines, but these I think go up
    to only 100PSI. Have seen ones for hydraulics that are
    rated higher...
  23. Closed: Re: Is a tantulum different from a microfarad tantulum cap?

    0.68uF is well within the range of 35V ceramic caps. But you
    should never apply a capacitor at (or even near) its rated

    In an audio application where this cap might see a reversing ...
  24. Closed: Re: decoupling capacitors to ground or supply voltage?

    You should consider, from the recipient's "point of view"
    what is the prime reference ground. If the "vref" is
    developed against ground plane then the recipient ought
    to use the same ground plane...
  25. Closed: Re: how to change pir sensor coverage angle?

    You might be better off with an interruptor type sense,
    like they used to use on garage door safety systems
    (maybe still) - co-located emitter and detector, and a
    far-end mirror. The emitter has...
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