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Type: Posts; User: crutschow

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    Closed: Re: NMOSFET On high side?

    How much current?
    If it's significantly more than the spec sheet value, then I suspect the gate-source voltage is not really zero.
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    Closed: Re: NMOSFET On high side?

    The cost of those items is quite low, so I don't see how that makes it "expensive"?
    Normal leakage current is usually negligible, but if you are worried about a pathological case, then the answer to...
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    Closed: Re: Adding an offset voltage to a signal

    Here's a single supply, single op amp circuit that adds the offset.

    How do you plan on generating the 1.2V?

    155285
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    Closed: Re: NMOSFET On high side?

    If you don't have that voltage available then you can easily generate it from the higher MOSFET voltage using a resistor and a 15V zener along with a filter cap.
    The circuit only requires 100uA at...
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    Closed: Re: NMOSFET On high side?

    Here's the LTspice simulation of a discrete bootstrap high-side driver that requires no additional voltage supply.

    155218
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    Closed: Re: Single supply low-side shunt amplifier

    You can buy single supply or rail-rail op amps with a few tens of microvolts input offset.
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    Closed: Re: LTSpice Noise Analyis

    One way is to simulate the noise of the model and see how it compares to the specs from the device data sheet.
  8. Closed: Re: Cut-off current through an N-channel power MOSFET with negatively charged gate

    Gate curreent is always very low and independent of drain voltage, since the gate looks like a capacitor.

    What is the perceived problem you have?
  9. Closed: Re: How to switch feedback networsk in synchronous Step-Down Voltage Regulator?

    You don't need a negative voltage for an analog switch, such as a CD4066, unless you are switching a negative voltage.
  10. Closed: Re: Square wave generation without Microcontroller

    To generate that pulse train four times for each button press would require two multivibrators and a 2-bit counter.
    A mico would be a lot simpler and cheaper.
  11. Closed: Re: What is the Max RMS System Noise before 'hiss' is can be heard in Headphones.

    I'd say you want any noise to be at least 60dB below the maximum peak audio signal level, with 75dB or more desirable.
    Old analog audio tape recorders had a S/N of only about 45dB if I remember...
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    Closed: Re: TLV4172 low-cost substitute

    If it's dual power, why do you need rail-rail?
  13. Closed: Re: Use an OR wired with diodes to control the gate in a PMOSFET

    Since you still haven't clearly stated what you need, I can't help you any further.
  14. Closed: Re: Use an OR wired with diodes to control the gate in a PMOSFET

    That's only one input condition out of four possible.
    What about both inputs zero?
    What about both inputs one?
  15. Closed: Re: Use an OR wired with diodes to control the gate in a PMOSFET

    So what exactly is the intended function?
    I'm confused about that.
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    Closed: Re: output of the circuit

    Yes, the circuit will likely oscillate, but why do you want that?
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    Closed: Re: Stable PWM during Voltage Loss

    You'll need to use the big cap.

    But, if the interruption is only for 50µs, the cap shouldn't need to be that large.
  18. Closed: Re: MOSFET linear and saturation region operation

    Okay.
    But that's generally true for any parts in a feedback loop, not just MOSFETs.
    It you don't need the equations, don't use them.
    But they are necessary for a fundamental understanding of the...
  19. Closed: Re: MOSFET linear and saturation region operation

    Because that describes how the MOSFET responds to the gate-source voltage in the linear region.
    Just because you've never used that info doesn't mean no-one does.

    Besides, the info in the "linear...
  20. Closed: Re: MOSFET linear and saturation region operation

    Perhaps this diagram from Wikipedia will help clarify:

    154431



    There's no easy way to calculate the Vds required for a required resistor value since there's a wide variation in the Vgs...
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    Closed: Re: Differential probe build

    Post deleted.
  22. Closed: Re: diffrentiate between lost wire detection and zero input in a terminal

    I suggest you post a schematic of the exact input circuit you have, so we can avoid a game of 20 questions. :wink:
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    Closed: Re: NE555 astable frquency

    Since the frequency of the 555 doesn't vary much with the setting of the duty-cycle pot, the value you get using 1/2 the pot resistance should be good enough for a reasonable estimate of the...
  24. Closed: Re: What is the definition of the efficiency in energy harvesting circuit ??

    Efficiency is basically the harvested output power divided by the input power from the source.
  25. Closed: Re: overcurrent and reverse polarity protection

    R2 is only needed if the input voltage is higher than the Vgs(max) rating of the MOSFET.

    You leave the collector-emitter connection open.
    If you short that connection how could the transistor...
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