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Type: Posts; User: clros

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    Closed: Re: Wrong simulation for VP0808 mosfet?

    Yes, OK.
    I would like to get a behavior like the one described by the simulator, in particular that the mosfet does NOT lead when Vgs is equal to GND.

    So I should choose a MOSFET with a fairly...
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    Closed: Re: Wrong simulation for VP0808 mosfet?

    Can anyone help me, please?
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    Closed: Re: Wrong simulation for VP0808 mosfet?

    If I understand well, for P-MOSFET, the Vgs should be less than Vth:

    Vgs < Vth

    When I connect my gate to Vdd I have Vgs = 0V
    When I connect the gate to GND, Vgs = -3.3V
    When I connect the...
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    Closed: Wrong simulation for VP0808 mosfet?

    In this simulation (I am using multisim 14.0), the output voltage value (measured from XMM1) multimeter is:

    ~0V when S1 is on VDD
    ~0V when S1 is on GND
    3.3V when S1 is on VSS

    156803

    But,...
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    Closed: Re: Old Altera FPGA EPM7128

    Just to play.
    I need an FPGA that I already know, with a good number of IO pins and that I can mount on a PLCC socket
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    Closed: Old Altera FPGA EPM7128

    I'm looking for old Altera EPM7128SL FPGAs.
    On ebay there are many at a bargain price, but I don't trust them. Could you give me some advice on where to buy them?
  7. Replies
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    Closed: Re: Semiconductor software simulation

    Can you tell me where to find the old versions of this software?
  8. Replies
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    Closed: Semiconductor software simulation

    Are there software that allow you to simulate the charge distribution in the semiconductors?
    I general, are there software that allow to simulate behave of different combination of semiconductor?
  9. Replies
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    Closed: Re: TopoR autorouter - set distance

    Honestly, this is the first time I use KiCad with such a complex project. (I've always used Ultiboard).
    At this point I think I'm wrong to set the KiCad rules, but how to do it?
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    Closed: TopoR autorouter - set distance

    I am make my circuit with Kicad and I am using TopoR for autorouting.

    My problem is how to set minimal distance from vias.

    My PCB maker says that "The space between holes is less than 0.35mm"....
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    [SOLVED]Closed: Re: Protect FPGA Pin from negative voltage

    Ok.
    For this reason, can I to use a Greater resistor (470 ohm)? The drop voltage should be acceptable, the current through diode BAT is lower and the voltage is less than -0.4V and I are secure with...
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    [SOLVED]Closed: Re: Protect FPGA Pin from negative voltage

    Hi,



    I think that there is a voltage drop on my resistance. Am I wrong?



    Unfortunately I'm not an electronic engineer, I'm a programmer who delights in hardware!
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    [SOLVED]Closed: Re: Protect FPGA Pin from negative voltage

    156301

    This is the correct connection?

    In this case, the logic level 1 (in my case +3.3V) will have a lowering and will not come with its value (+3.3v) to the FPGA.
    I hope this won't cause...
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    [SOLVED]Closed: Re: Protect FPGA Pin from negative voltage

    I should use a maximum frequency of 3 MHz.
    How I understand if the BAT is adequate?
  15. Replies
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    [SOLVED]Closed: Re: Protect FPGA Pin from negative voltage

    I simulated without FPGA, but with a load of 1MOhm // 6pF (that should be the impedeance of FPGA IO pins).

    The current thath I see in simulation is maximum of -14mA. If I understand well, the...
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    [SOLVED]Closed: Re: Protect FPGA Pin from negative voltage

    Thanks for response.

    Altera datasheet says thar minimum voltage on its IO pins is -0.5V.

    ButI didn't understand how to insert the resistor ... in series with diode (towards ground) or in series...
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    [SOLVED]Closed: Protect FPGA Pin from negative voltage

    Hi to all,

    In a my project I am using an Altera/Intel Cyclone IV FPGA.

    For some reason, the IO pins can be drivered with a negative voltage (-3.3V) that I would is interpreted as logic level...
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    [SOLVED]Closed: CD4053 connect unused pins

    Hi,
    in a cd4053 I do not used some pins (input and output).

    How should I connect them?
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    Closed: Re: Two ps/2 ports and a FPGA

    Can you tell me some circuit to do it?
  20. Replies
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    Closed: Two ps/2 ports and a FPGA

    Hi,

    I would use 2 ps/2 (mini din 6 pin) ports with only one FPGA.

    The signal "clock" can be the same for the two ps/2 ports? Can I drive the pins 5 of ps/2 connector with only one FPGA pin?
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    [SOLVED]Closed: DC-DC converter to -3.3v

    Hi,

    I need a DC-DC converter with a positive voltage input (+5V) and a negative voltage output (-3.3v) with a current minimum of 2A.

    Can suggest me a circuit or a low cost Converter on a...
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    Closed: Re: Switching power supply

    I would like to use directly the voltage (220V / 110V) if possible




    I should try it. Where can I find it?
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    Closed: Switching power supply

    I would like to design a switching power supply that provides different voltages for a circuit I designed.
    I need a double voltage (+/- 3v) and two other voltages (+ 5v, +12v).

    I have no...
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    Closed: PCB Service in Europe/USA

    Hi everyone,
    to make the PCBs of my projects, I always turned to China and I always had low prices and great quality, I could also have SMD components mounted.
    Usually it was always a 4-layer PCB,...
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    Closed: TLV4172 low-cost substitute

    Hi,

    for my project I am using a TLV4172/OPA4172 OpAmp.

    I'm using this OpAmp because it's rail to rail and it's dual power. These are features that I need.
    But it's very expensive. Are you...
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