Does a diode block current but not voltage?

The name of the pictureThe name of the pictureThe name of the pictureClash Royale CLAN TAG#URR8PPP











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












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






active

oldest

votes

















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




















    Your Answer




    StackExchange.ifUsing("editor", function ()
    return StackExchange.using("mathjaxEditing", function ()
    StackExchange.MarkdownEditor.creationCallbacks.add(function (editor, postfix)
    StackExchange.mathjaxEditing.prepareWmdForMathJax(editor, postfix, [["\$", "\$"]]);
    );
    );
    , "mathjax-editing");

    StackExchange.ifUsing("editor", function ()
    return StackExchange.using("schematics", function ()
    StackExchange.schematics.init();
    );
    , "cicuitlab");

    StackExchange.ready(function()
    var channelOptions =
    tags: "".split(" "),
    id: "135"
    ;
    initTagRenderer("".split(" "), "".split(" "), channelOptions);

    StackExchange.using("externalEditor", function()
    // Have to fire editor after snippets, if snippets enabled
    if (StackExchange.settings.snippets.snippetsEnabled)
    StackExchange.using("snippets", function()
    createEditor();
    );

    else
    createEditor();

    );

    function createEditor()
    StackExchange.prepareEditor(
    heartbeatType: 'answer',
    convertImagesToLinks: false,
    noModals: false,
    showLowRepImageUploadWarning: true,
    reputationToPostImages: null,
    bindNavPrevention: true,
    postfix: "",
    onDemand: true,
    discardSelector: ".discard-answer"
    ,immediatelyShowMarkdownHelp:true
    );



    );













     

    draft saved


    draft discarded


















    StackExchange.ready(
    function ()
    StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2felectronics.stackexchange.com%2fquestions%2f402252%2fdoes-a-diode-block-current-but-not-voltage%23new-answer', 'question_page');

    );

    Post as a guest

















    1 Answer
    1






    active

    oldest

    votes








    1 Answer
    1






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes








    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













      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




        75.7k573165



























             

            draft saved


            draft discarded















































             


            draft saved


            draft discarded














            StackExchange.ready(
            function ()
            StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2felectronics.stackexchange.com%2fquestions%2f402252%2fdoes-a-diode-block-current-but-not-voltage%23new-answer', 'question_page');

            );

            Post as a guest
































































            Comments

            Post a Comment

            Popular posts from this blog

            Long meetings (6-7 hours a day): Being “babysat” by supervisor

            Image
            Clash Royale CLAN TAG #URR8PPP .everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty margin-bottom:0; up vote 31 down vote favorite 4 I hold a PhD in mechanical engineering with a 7 year background in self-guided, self-paced research including 2 years as a graduate level course instructor and a subject matter expert for various engineering projects in a university setting in the United States. For the last 10-11 months, I am working in a research industry in France where my task is to debug C++ spaghetti code written over a period of several years by my current supervisor. It is a team of 2: just I and my supervisor. Diurnally, I am posed with a "bug of the day" to get out of this C++ code. My supervisor generally gives me about 15-30 minutes to solve it and then accosts me about whether or not the task is completed and then rinses and repeats this until the end of the day. Off-late, my supervisor has been holding 6-7 hour long "meetin
            Read more

            Is the Concept of Multiple Fantasy Races Scientifically Flawed? [closed]

            Image
            Clash Royale CLAN TAG #URR8PPP up vote 2 down vote favorite Many fantasy worlds have multiple humanoid species (elves, orcs, humans, etc) living in the same world, in addition to that, they often have the ability to interbreed. And I can't help but question their believability... fantasy-races reproduction interspecies-relations share | improve this question edited Aug 9 at 14:46 Michael Kjörling ♦ 21.1k 10 85 161 asked Aug 9 at 13:13 Chlodio 118 6 closed as unclear what you're asking by MichaelK, Gryphon, John, Vincent, Frostfyre Aug 9 at 15:25 Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question. 3 Stack Exchange exist to
            Read more

            Confectionery

            Image
            Prepared foods made with a lot of sugar or other cabohydrates "Sweetmeat" redirects here. For the racehorse, see Sweetmeat (horse). Not to be confused with Sweetbread. This Kransekake is a traditional Scandinavian baker's confection. Confectionery is the art of making confections , which are food items that are rich in sugar and carbohydrates. Exact definitions are difficult. [1] In general, though, confectionery is divided into two broad and somewhat overlapping categories, bakers' confections and sugar confections. [2] Bakers' confectionery, also called flour confections , includes principally sweet pastries, cakes, and similar baked goods. Sugar confectionery includes candies ( sweets in British English), candied nuts, chocolates, chewing gum, bubble gum, pastillage, and other confections that are made primarily of sugar. In some cases, chocolate confections (confections made of chocolate) are treated as a separate category, as are sugar-free versions of
            Read more