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I want to ask Is Vds is equal to Vd ? and What could be the conditions for Vds= Vgs. And what is difference between Vgs and vgs?

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Vds is not the same as Vd. Rather, Vds = Vd - Vs.

Vds equal to Vgs would imply the gate is connected to the drain, not an uncommon arrangement. It makes the transistor act something like a diode.

Typically, Vgs would be used to represent the total DC+AC gate-source voltage, while vgs would represent the AC component of the gate-source voltage only.

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  • \$\begingroup\$ and one more question. Is Vdd is equal to Vd? \$\endgroup\$ – Shehroz Ahmad Apr 26 '17 at 0:11
  • \$\begingroup\$ That's a bit questionable really. In some cases, Vdd refers to the entire circuit's voltage supply, which may be different than the actual drain-to-ground voltage that Vd represents. But in other cases, they may refer to the same thing. \$\endgroup\$ – Hearth Apr 26 '17 at 0:15
  • \$\begingroup\$ last one. If a source resistance is given how could we draw the pi-model? or we have to draw the T-model? \$\endgroup\$ – Shehroz Ahmad Apr 26 '17 at 0:17
  • \$\begingroup\$ You just put a resistor in series with the source terminal of the model. That should work regardless of which model you use. \$\endgroup\$ – Hearth Apr 26 '17 at 0:20
  • \$\begingroup\$ do you have a facebook account or whatsapp I have to ask some more questions in person if you don't mind. \$\endgroup\$ – Shehroz Ahmad Apr 26 '17 at 0:22

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