Does a diode block current but not voltage?

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When running this test circuit on CircuitLab and my expected result was that only M1 would open
but then i noticed that the M4 mosfet is also open even though there is a diode between it and the the 3V
the Gate threshold on both is set to 1.5v



i also noticed some strange spikes appearing on the current



Does it mean a diode blocks current but not voltage ?





schematic





simulate this circuit – Schematic created using CircuitLab






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    Non-ideal diodes have leakage current. It, together with random noise, charge up the M4 gate capacitance.
    – Long Pham
    1 hour ago










  • That's in fact the answer.
    – Janka
    59 mins ago














up vote
1
down vote

favorite












When running this test circuit on CircuitLab and my expected result was that only M1 would open
but then i noticed that the M4 mosfet is also open even though there is a diode between it and the the 3V
the Gate threshold on both is set to 1.5v



i also noticed some strange spikes appearing on the current



Does it mean a diode blocks current but not voltage ?





schematic





simulate this circuit – Schematic created using CircuitLab






circuit-analysis







share|improve this question

















  • 1




    Non-ideal diodes have leakage current. It, together with random noise, charge up the M4 gate capacitance.
    – Long Pham
    1 hour ago










  • That's in fact the answer.
    – Janka
    59 mins ago












up vote
1
down vote

favorite









up vote
1
down vote

favorite











When running this test circuit on CircuitLab and my expected result was that only M1 would open
but then i noticed that the M4 mosfet is also open even though there is a diode between it and the the 3V
the Gate threshold on both is set to 1.5v



i also noticed some strange spikes appearing on the current



Does it mean a diode blocks current but not voltage ?





schematic





simulate this circuit – Schematic created using CircuitLab






circuit-analysis







share|improve this question













When running this test circuit on CircuitLab and my expected result was that only M1 would open
but then i noticed that the M4 mosfet is also open even though there is a diode between it and the the 3V
the Gate threshold on both is set to 1.5v



i also noticed some strange spikes appearing on the current



Does it mean a diode blocks current but not voltage ?





schematic





simulate this circuit – Schematic created using CircuitLab






circuit-analysis




circuit-analysis






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked 1 hour ago









soundslikefiziks

428315




428315







  • 1




    Non-ideal diodes have leakage current. It, together with random noise, charge up the M4 gate capacitance.
    – Long Pham
    1 hour ago










  • That's in fact the answer.
    – Janka
    59 mins ago












  • 1




    Non-ideal diodes have leakage current. It, together with random noise, charge up the M4 gate capacitance.
    – Long Pham
    1 hour ago










  • That's in fact the answer.
    – Janka
    59 mins ago







1




1




Non-ideal diodes have leakage current. It, together with random noise, charge up the M4 gate capacitance.
– Long Pham
1 hour ago




Non-ideal diodes have leakage current. It, together with random noise, charge up the M4 gate capacitance.
– Long Pham
1 hour ago












That's in fact the answer.
– Janka
59 mins ago




That's in fact the answer.
– Janka
59 mins ago










1 Answer
1






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3
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enter image description here



Figure 3 from the 1N4148 datasheet.



  • Diodes have very small leakage current. At 3 V this will be between 3.5 and 10 nA.

  • The 2N7000 has a gate−body leakage current, Forward of -10 nA max.

  • The diode also has about 4 pF capacitance. When the supply voltage jumps from zero to +3 V on power-up the diode capacitance will cause the gate of M4 to jump up too.





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    enter image description here



    Figure 3 from the 1N4148 datasheet.



    • Diodes have very small leakage current. At 3 V this will be between 3.5 and 10 nA.

    • The 2N7000 has a gate−body leakage current, Forward of -10 nA max.

    • The diode also has about 4 pF capacitance. When the supply voltage jumps from zero to +3 V on power-up the diode capacitance will cause the gate of M4 to jump up too.





    share|improve this answer
























      up vote
      3
      down vote













      enter image description here



      Figure 3 from the 1N4148 datasheet.



      • Diodes have very small leakage current. At 3 V this will be between 3.5 and 10 nA.

      • The 2N7000 has a gate−body leakage current, Forward of -10 nA max.

      • The diode also has about 4 pF capacitance. When the supply voltage jumps from zero to +3 V on power-up the diode capacitance will cause the gate of M4 to jump up too.





      share|improve this answer






















        up vote
        3
        down vote










        up vote
        3
        down vote









        enter image description here



        Figure 3 from the 1N4148 datasheet.



        • Diodes have very small leakage current. At 3 V this will be between 3.5 and 10 nA.

        • The 2N7000 has a gate−body leakage current, Forward of -10 nA max.

        • The diode also has about 4 pF capacitance. When the supply voltage jumps from zero to +3 V on power-up the diode capacitance will cause the gate of M4 to jump up too.





        share|improve this answer












        enter image description here



        Figure 3 from the 1N4148 datasheet.



        • Diodes have very small leakage current. At 3 V this will be between 3.5 and 10 nA.

        • The 2N7000 has a gate−body leakage current, Forward of -10 nA max.

        • The diode also has about 4 pF capacitance. When the supply voltage jumps from zero to +3 V on power-up the diode capacitance will cause the gate of M4 to jump up too.






        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered 58 mins ago









        Transistor

        75.7k573165




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