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Type: Posts; User: dick_freebird

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  1. 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...
  2. Closed: Re: CMOS FINFET Layout Tutorials/Explanations

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

    https://www.google.com/search?q=finfet%20tutorial

    See? Easy and effective. You can do it. Yes you can.
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    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...
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    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...
  5. 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...
  6. 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...
  7. 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....
  8. 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...
  9. 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.
  10. 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.
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    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...
  12. 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
    voltage.

    In an audio application where this cap might see a reversing ...
  13. 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...
  14. 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...
  15. Closed: Re: Active Precision Current Limiting circuit needed

    "Current limit" is usually a fault mode and considered not
    especially critical accuracy-wise; its purpose is reliability
    when designed into a part.

    Maybe you want a precision current source...
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    Closed: Re: Decoupling Capacitance in IC Layo

    If you have the other parasitics modeled clean all the way
    from pins to transistor terminals, then you can play with
    decoupling values and placement to get "as good as will
    fit" supply quality...
  17. Closed: Re: Overdrive voltage relationship to the op-amp speed

    Not just the gm. Everything past the front end sees a current
    -difference- as the "driving force" for large signal swings. If
    you think of the gain stage input as a simple capacitor and
    call its...
  18. Closed: Re: Why would a scope suddenly give noisy traces when it never used to?

    Missing from the description, is whether this is confined to
    the batch of "bad" boards or whether the "fuzz" now also
    appears on boards that formerly tested "good" and "fuzz
    free" on the bench....
  19. Closed: Re: Speed relationship to the operational amplifier speed

    Equations only tell you, what their author told them.
    Equations are always (or at best) simplifications of
    reality.

    When most people talk about "shorter gate" being
    "faster" they often talk...
  20. Closed: Re: Spice .INC file into Cadence Spectre/DFII

    Then you use the same syntax, but you have to invoke
    the inclusion yourself.
  21. Closed: Re: Spice .INC file into Cadence Spectre/DFII

    Put it the tail of some already-invoked model file chain (.scs)
    and wrap it like

    simulator lang=SPICE
    {file guts intact}
    simulator lang=spectre

    Then it should work automagically.
  22. Closed: Re: Capacitors in input voltage circuit before and after reverse polarity protection

    Because the diode series L, R will "kill" the high frequency
    performance of any upstream capacitors, you place the
    low value high frequency caps inside the reverse blocking
    diode close-in to the...
  23. Closed: Re: What is Double Snapback Characteristics in High-Voltage nMOSFETs

    Snapback is in fact desirable and key to good NMOS-as-clamp
    (or self-protection) ESD performance. You -want- a low holding
    voltage (but greater than any spec load condition).

    The other key is,...
  24. Closed: Re: Harmonics in a 12 V brushed DC Motor

    There is the commutation frequency and its chop-harmonics,
    but there is also broadband emission from the spark-gaps the
    commutator has by construction. And these "noise bursts" are ...
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    Closed: Re: Rplpoly layout matching problem

    Case 1: You put in identical schematic values and you
    got (SDL synthesis) non-identical layout dimensions.
    This would seem improbable.

    Case 2: You got identical resistor segment geometries...
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