nuno407

modified 11 years ago

Cmos inverter

146

01:33:33

Cmos

published 11 years ago

ETJAKEOC

11 years ago

Change 300um width to 10um

Igor

11 years ago

Why do you think 5.23 mA is correct?

nuno407

11 years ago

The parameters are this. Because is the correct answer :)

ZyanWu

11 years ago

I=KP/2*W/L*(VGS-VT0)^2. Input the parameters and it will give you 70mA, not 5mA. Check the parameters.

nuno407

11 years ago

This equation are wrong...

hurz

11 years ago

This equation is just fine. Thanx @ZyanWu

hurz

11 years ago

@nuno407 which equations are you using? Probably they are better, but you have to show them at least.

nuno407

11 years ago

For triode id=Kp(2(Vgs-Vt)Vds-Vds^2). For saturatio: Kp(Vgs-Vt)^2. Are wrong?

nuno407

11 years ago

And Kp=1/2*Un*Cox*(W/L)

nuno407

11 years ago

P-channel mos is saturated right? @hurz

ZyanWu

11 years ago

N-channel mos is saturated, P is in triode region. This circuit simulator uses KP = un *Cox and Id=KP/2*W/L*(VGS-VT)^2. That's the problem.

nuno407

11 years ago

@ZyanWu I finally understand! :) but this implementation is normal? :s

hurz

11 years ago

Simulators are just using models and models are only an abstraction of whats happened in reality. To keep things simple, models are also as simple as possible. If models are to complex simulators have stability problems or performace problems. I think EC found an excellent medium way to abstract the world of electronic! Not to complex, but also not to simple.

nuno407

11 years ago

I think that EC is a excellent program but in my books/University every teacher say that kp=1/2 * un* Cox *(w/L)

ZyanWu

11 years ago

Yeah, it's just a convention and, unfortunately, EveryCircuit doesn't have a manual because that's where all equations and conventions should be written, so that everyone knows what they've inputed as parameters... I've learned that KP is just un * Cox but some other books use other notations, for example, they use B (beta) for 1/2*un*Cox*W/L or Vov = VGS-VT, which gives Id = B*Vov^2, another equations which is also correct if the user knows the conventions used. So, EveryCircuit's lack of documentation (manual) kind of sucks. :(

nuno407

11 years ago

Exactly..... I think in this to. Should be available some manual to explain what are the parameters... Like you say.

nuno407

11 years ago

@Igor

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