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Dependent voltage/current sources


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$begingroup$


I'm so sorry for that questions, but we need to understand what's going on behind the concept/theoretical of using device "dependent voltage/current source"!



My question: Yes, we are using dependent voltage/current source, but is there a device like this in real life? If so, let's assume that at branch k there's voltage k, my dependent voltage source is at branch k + 5 in the circuit, so how does my dependent voltage source knows the voltage at branch k? theoretically we say just assigning it once we find it .. but how it's going behind?!










share|improve this question









New contributor



Tony.M is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






$endgroup$












  • $begingroup$
    We can treat the BJT's or a MOSFET' as a VCCS. Or we can use an opamp to create any you like.
    $endgroup$
    – G36
    8 hours ago










  • $begingroup$
    Look up Howland Current source. Notice the input voltage can regulate the current as long as the load resistance does not result in a voltage exceeding the supply rails. Due to high open loop voltage gain and feedback, it works over a very wide range.
    $endgroup$
    – Sunnyskyguy EE75
    8 hours ago










  • $begingroup$
    The real power of dependent sources isn't that you can make them (you can), but that you can use them in small-signal circuit analysis in a way that makes all sorts of circuit elements (like transistors) easier to work with.
    $endgroup$
    – TimWescott
    7 hours ago










  • $begingroup$
    Typically dependent voltage/current sources in real life are probably things that contain various components. So if you have an dependent voltage source, for an example, of $5V_{in}$, it means that you have to design a circuit that will give an output that is five times large than your input voltage.
    $endgroup$
    – KingDuken
    7 hours ago


















1












$begingroup$


I'm so sorry for that questions, but we need to understand what's going on behind the concept/theoretical of using device "dependent voltage/current source"!



My question: Yes, we are using dependent voltage/current source, but is there a device like this in real life? If so, let's assume that at branch k there's voltage k, my dependent voltage source is at branch k + 5 in the circuit, so how does my dependent voltage source knows the voltage at branch k? theoretically we say just assigning it once we find it .. but how it's going behind?!










share|improve this question









New contributor



Tony.M is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






$endgroup$












  • $begingroup$
    We can treat the BJT's or a MOSFET' as a VCCS. Or we can use an opamp to create any you like.
    $endgroup$
    – G36
    8 hours ago










  • $begingroup$
    Look up Howland Current source. Notice the input voltage can regulate the current as long as the load resistance does not result in a voltage exceeding the supply rails. Due to high open loop voltage gain and feedback, it works over a very wide range.
    $endgroup$
    – Sunnyskyguy EE75
    8 hours ago










  • $begingroup$
    The real power of dependent sources isn't that you can make them (you can), but that you can use them in small-signal circuit analysis in a way that makes all sorts of circuit elements (like transistors) easier to work with.
    $endgroup$
    – TimWescott
    7 hours ago










  • $begingroup$
    Typically dependent voltage/current sources in real life are probably things that contain various components. So if you have an dependent voltage source, for an example, of $5V_{in}$, it means that you have to design a circuit that will give an output that is five times large than your input voltage.
    $endgroup$
    – KingDuken
    7 hours ago














1












1








1





$begingroup$


I'm so sorry for that questions, but we need to understand what's going on behind the concept/theoretical of using device "dependent voltage/current source"!



My question: Yes, we are using dependent voltage/current source, but is there a device like this in real life? If so, let's assume that at branch k there's voltage k, my dependent voltage source is at branch k + 5 in the circuit, so how does my dependent voltage source knows the voltage at branch k? theoretically we say just assigning it once we find it .. but how it's going behind?!










share|improve this question









New contributor



Tony.M is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






$endgroup$




I'm so sorry for that questions, but we need to understand what's going on behind the concept/theoretical of using device "dependent voltage/current source"!



My question: Yes, we are using dependent voltage/current source, but is there a device like this in real life? If so, let's assume that at branch k there's voltage k, my dependent voltage source is at branch k + 5 in the circuit, so how does my dependent voltage source knows the voltage at branch k? theoretically we say just assigning it once we find it .. but how it's going behind?!







electrical






share|improve this question









New contributor



Tony.M is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.










share|improve this question









New contributor



Tony.M is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.








share|improve this question




share|improve this question








edited 8 hours ago









Transistor

93k788203




93k788203






New contributor



Tony.M is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.








asked 8 hours ago









Tony.MTony.M

61




61




New contributor



Tony.M is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.




New contributor




Tony.M is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.














  • $begingroup$
    We can treat the BJT's or a MOSFET' as a VCCS. Or we can use an opamp to create any you like.
    $endgroup$
    – G36
    8 hours ago










  • $begingroup$
    Look up Howland Current source. Notice the input voltage can regulate the current as long as the load resistance does not result in a voltage exceeding the supply rails. Due to high open loop voltage gain and feedback, it works over a very wide range.
    $endgroup$
    – Sunnyskyguy EE75
    8 hours ago










  • $begingroup$
    The real power of dependent sources isn't that you can make them (you can), but that you can use them in small-signal circuit analysis in a way that makes all sorts of circuit elements (like transistors) easier to work with.
    $endgroup$
    – TimWescott
    7 hours ago










  • $begingroup$
    Typically dependent voltage/current sources in real life are probably things that contain various components. So if you have an dependent voltage source, for an example, of $5V_{in}$, it means that you have to design a circuit that will give an output that is five times large than your input voltage.
    $endgroup$
    – KingDuken
    7 hours ago


















  • $begingroup$
    We can treat the BJT's or a MOSFET' as a VCCS. Or we can use an opamp to create any you like.
    $endgroup$
    – G36
    8 hours ago










  • $begingroup$
    Look up Howland Current source. Notice the input voltage can regulate the current as long as the load resistance does not result in a voltage exceeding the supply rails. Due to high open loop voltage gain and feedback, it works over a very wide range.
    $endgroup$
    – Sunnyskyguy EE75
    8 hours ago










  • $begingroup$
    The real power of dependent sources isn't that you can make them (you can), but that you can use them in small-signal circuit analysis in a way that makes all sorts of circuit elements (like transistors) easier to work with.
    $endgroup$
    – TimWescott
    7 hours ago










  • $begingroup$
    Typically dependent voltage/current sources in real life are probably things that contain various components. So if you have an dependent voltage source, for an example, of $5V_{in}$, it means that you have to design a circuit that will give an output that is five times large than your input voltage.
    $endgroup$
    – KingDuken
    7 hours ago
















$begingroup$
We can treat the BJT's or a MOSFET' as a VCCS. Or we can use an opamp to create any you like.
$endgroup$
– G36
8 hours ago




$begingroup$
We can treat the BJT's or a MOSFET' as a VCCS. Or we can use an opamp to create any you like.
$endgroup$
– G36
8 hours ago












$begingroup$
Look up Howland Current source. Notice the input voltage can regulate the current as long as the load resistance does not result in a voltage exceeding the supply rails. Due to high open loop voltage gain and feedback, it works over a very wide range.
$endgroup$
– Sunnyskyguy EE75
8 hours ago




$begingroup$
Look up Howland Current source. Notice the input voltage can regulate the current as long as the load resistance does not result in a voltage exceeding the supply rails. Due to high open loop voltage gain and feedback, it works over a very wide range.
$endgroup$
– Sunnyskyguy EE75
8 hours ago












$begingroup$
The real power of dependent sources isn't that you can make them (you can), but that you can use them in small-signal circuit analysis in a way that makes all sorts of circuit elements (like transistors) easier to work with.
$endgroup$
– TimWescott
7 hours ago




$begingroup$
The real power of dependent sources isn't that you can make them (you can), but that you can use them in small-signal circuit analysis in a way that makes all sorts of circuit elements (like transistors) easier to work with.
$endgroup$
– TimWescott
7 hours ago












$begingroup$
Typically dependent voltage/current sources in real life are probably things that contain various components. So if you have an dependent voltage source, for an example, of $5V_{in}$, it means that you have to design a circuit that will give an output that is five times large than your input voltage.
$endgroup$
– KingDuken
7 hours ago




$begingroup$
Typically dependent voltage/current sources in real life are probably things that contain various components. So if you have an dependent voltage source, for an example, of $5V_{in}$, it means that you have to design a circuit that will give an output that is five times large than your input voltage.
$endgroup$
– KingDuken
7 hours ago










2 Answers
2






active

oldest

votes


















3












$begingroup$

A voltage/current depending source in real life needs to be built from actual electronic components. Usually made from operational amplifiers or transistors. They vary a bit from the ideal voltage/current sources in that they:




  • Don't have infinite voltage/current and have finite power

  • Usually have small offsets

  • Have source impedance

  • Have bandwidth or slew rate (can't source/sink current infinitely fast)


Here are some ways these circuits can be built in the real world:



B and C are voltage dependent current sources



An op amp in a voltage follower configuration is a voltage controlled voltage source.



enter image description here
Source: https://www.maximintegrated.com/en/app-notes/index.mvp/id/3869






share|improve this answer









$endgroup$













  • $begingroup$
    Low current opamps such as this are a great example of what can be designed. Note here that all the examples are voltage controlled current sources ….not just B and C. It's also worth noting that you can only implement this type of CC source where you have a single opamp in the package since you are using the +/- supplies as in circuit points.
    $endgroup$
    – Jack Creasey
    7 hours ago



















1












$begingroup$

They exist but are circuits unto themselves so you abstract them away as singular components during circuit analysis so you don't get overwhelmed. Being circuits, they have to hook into other parts of the circuit you are dependent on to monitor things which isn't shown so you don't get overwhelmed.



It's no different from how you might draw an op-amp symbol, a current source symbol, or a voltage source symbol in your circuit when in reality that symbol represents an entire circuit (which might be more complicated than the circuit you just placed the symbol in).






share|improve this answer









$endgroup$














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    2 Answers
    2






    active

    oldest

    votes








    2 Answers
    2






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes









    3












    $begingroup$

    A voltage/current depending source in real life needs to be built from actual electronic components. Usually made from operational amplifiers or transistors. They vary a bit from the ideal voltage/current sources in that they:




    • Don't have infinite voltage/current and have finite power

    • Usually have small offsets

    • Have source impedance

    • Have bandwidth or slew rate (can't source/sink current infinitely fast)


    Here are some ways these circuits can be built in the real world:



    B and C are voltage dependent current sources



    An op amp in a voltage follower configuration is a voltage controlled voltage source.



    enter image description here
    Source: https://www.maximintegrated.com/en/app-notes/index.mvp/id/3869






    share|improve this answer









    $endgroup$













    • $begingroup$
      Low current opamps such as this are a great example of what can be designed. Note here that all the examples are voltage controlled current sources ….not just B and C. It's also worth noting that you can only implement this type of CC source where you have a single opamp in the package since you are using the +/- supplies as in circuit points.
      $endgroup$
      – Jack Creasey
      7 hours ago
















    3












    $begingroup$

    A voltage/current depending source in real life needs to be built from actual electronic components. Usually made from operational amplifiers or transistors. They vary a bit from the ideal voltage/current sources in that they:




    • Don't have infinite voltage/current and have finite power

    • Usually have small offsets

    • Have source impedance

    • Have bandwidth or slew rate (can't source/sink current infinitely fast)


    Here are some ways these circuits can be built in the real world:



    B and C are voltage dependent current sources



    An op amp in a voltage follower configuration is a voltage controlled voltage source.



    enter image description here
    Source: https://www.maximintegrated.com/en/app-notes/index.mvp/id/3869






    share|improve this answer









    $endgroup$













    • $begingroup$
      Low current opamps such as this are a great example of what can be designed. Note here that all the examples are voltage controlled current sources ….not just B and C. It's also worth noting that you can only implement this type of CC source where you have a single opamp in the package since you are using the +/- supplies as in circuit points.
      $endgroup$
      – Jack Creasey
      7 hours ago














    3












    3








    3





    $begingroup$

    A voltage/current depending source in real life needs to be built from actual electronic components. Usually made from operational amplifiers or transistors. They vary a bit from the ideal voltage/current sources in that they:




    • Don't have infinite voltage/current and have finite power

    • Usually have small offsets

    • Have source impedance

    • Have bandwidth or slew rate (can't source/sink current infinitely fast)


    Here are some ways these circuits can be built in the real world:



    B and C are voltage dependent current sources



    An op amp in a voltage follower configuration is a voltage controlled voltage source.



    enter image description here
    Source: https://www.maximintegrated.com/en/app-notes/index.mvp/id/3869






    share|improve this answer









    $endgroup$



    A voltage/current depending source in real life needs to be built from actual electronic components. Usually made from operational amplifiers or transistors. They vary a bit from the ideal voltage/current sources in that they:




    • Don't have infinite voltage/current and have finite power

    • Usually have small offsets

    • Have source impedance

    • Have bandwidth or slew rate (can't source/sink current infinitely fast)


    Here are some ways these circuits can be built in the real world:



    B and C are voltage dependent current sources



    An op amp in a voltage follower configuration is a voltage controlled voltage source.



    enter image description here
    Source: https://www.maximintegrated.com/en/app-notes/index.mvp/id/3869







    share|improve this answer












    share|improve this answer



    share|improve this answer










    answered 8 hours ago









    laptop2dlaptop2d

    32k123898




    32k123898












    • $begingroup$
      Low current opamps such as this are a great example of what can be designed. Note here that all the examples are voltage controlled current sources ….not just B and C. It's also worth noting that you can only implement this type of CC source where you have a single opamp in the package since you are using the +/- supplies as in circuit points.
      $endgroup$
      – Jack Creasey
      7 hours ago


















    • $begingroup$
      Low current opamps such as this are a great example of what can be designed. Note here that all the examples are voltage controlled current sources ….not just B and C. It's also worth noting that you can only implement this type of CC source where you have a single opamp in the package since you are using the +/- supplies as in circuit points.
      $endgroup$
      – Jack Creasey
      7 hours ago
















    $begingroup$
    Low current opamps such as this are a great example of what can be designed. Note here that all the examples are voltage controlled current sources ….not just B and C. It's also worth noting that you can only implement this type of CC source where you have a single opamp in the package since you are using the +/- supplies as in circuit points.
    $endgroup$
    – Jack Creasey
    7 hours ago




    $begingroup$
    Low current opamps such as this are a great example of what can be designed. Note here that all the examples are voltage controlled current sources ….not just B and C. It's also worth noting that you can only implement this type of CC source where you have a single opamp in the package since you are using the +/- supplies as in circuit points.
    $endgroup$
    – Jack Creasey
    7 hours ago













    1












    $begingroup$

    They exist but are circuits unto themselves so you abstract them away as singular components during circuit analysis so you don't get overwhelmed. Being circuits, they have to hook into other parts of the circuit you are dependent on to monitor things which isn't shown so you don't get overwhelmed.



    It's no different from how you might draw an op-amp symbol, a current source symbol, or a voltage source symbol in your circuit when in reality that symbol represents an entire circuit (which might be more complicated than the circuit you just placed the symbol in).






    share|improve this answer









    $endgroup$


















      1












      $begingroup$

      They exist but are circuits unto themselves so you abstract them away as singular components during circuit analysis so you don't get overwhelmed. Being circuits, they have to hook into other parts of the circuit you are dependent on to monitor things which isn't shown so you don't get overwhelmed.



      It's no different from how you might draw an op-amp symbol, a current source symbol, or a voltage source symbol in your circuit when in reality that symbol represents an entire circuit (which might be more complicated than the circuit you just placed the symbol in).






      share|improve this answer









      $endgroup$
















        1












        1








        1





        $begingroup$

        They exist but are circuits unto themselves so you abstract them away as singular components during circuit analysis so you don't get overwhelmed. Being circuits, they have to hook into other parts of the circuit you are dependent on to monitor things which isn't shown so you don't get overwhelmed.



        It's no different from how you might draw an op-amp symbol, a current source symbol, or a voltage source symbol in your circuit when in reality that symbol represents an entire circuit (which might be more complicated than the circuit you just placed the symbol in).






        share|improve this answer









        $endgroup$



        They exist but are circuits unto themselves so you abstract them away as singular components during circuit analysis so you don't get overwhelmed. Being circuits, they have to hook into other parts of the circuit you are dependent on to monitor things which isn't shown so you don't get overwhelmed.



        It's no different from how you might draw an op-amp symbol, a current source symbol, or a voltage source symbol in your circuit when in reality that symbol represents an entire circuit (which might be more complicated than the circuit you just placed the symbol in).







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered 8 hours ago









        DKNguyenDKNguyen

        3,5421422




        3,5421422






















            Tony.M is a new contributor. Be nice, and check out our Code of Conduct.










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