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enter image description here enter image description here I don’t understand what is the Use of ‘Vin’ as its anode connects to the open circuit.So I can’t even solve QA

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  • $\begingroup$ If vIN is a sine wave, it will vA is a sinewave equal to vIN. Which can be applied to current source as long as it meets restraints. It is a FET amplifier, which works on voltage. $\endgroup$ Sep 10 '21 at 16:04
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    $\begingroup$ This is a simplified mathematical model of a real circuit. See that no current flows through the open circuit VA, BUT the current through the current source depends on the voltage across the open circuit VA! $\endgroup$
    – user253751
    Sep 10 '21 at 16:35
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    $\begingroup$ This is not a circuit made from "real" components. It shows a mathematical description of what the real amplifier does. The math equations show how the Vout depends on Va, and in the left hand diagram Vin = Va. $\endgroup$
    – alephzero
    Sep 10 '21 at 19:06
  • $\begingroup$ what is the Use of ‘Vout’ as its anode connects to the open circuit.So I can’t even solve QA. Same with Vin. it's there to just say sample this in a manner where current is 0 $\endgroup$
    – Abel
    Sep 11 '21 at 3:09
  • $\begingroup$ We won't do your homework for you. If you still don't understand how to begin a problem like this you should talk to your instructor. $\endgroup$ Sep 11 '21 at 12:21

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