Recent content by Apogee

I apologize for the confusion. A small resistor was placed in series with drain (about 100 οhms) when measuring the NMOSs drain current. Vr is the voltage drop over that resistor. So id is essentially proportional to that curve.

I would agree. CS/CpE would be preferable if you know you're interested in systems programming. But if you're on the fence, I still think it's easier to jump ship from EE to that sort of a position than it is to go from a systems programming focus to circuit design. But then again, there are...

I understand these concepts, but I'm more concerned with the fact that the Id vs Vsd curve remains zero until a certain point. For Id vs Vsg, this makes sense, since there's a threshold voltage. But this doesn't make sense to me for Id vs Vsd.

Many people will probably disagree with me on this one. However, if you're debating between CS and EE, I would generally go with EE. A decent EE curriculum will include some programming classes, and software development is becoming an increasingly important skill in EE. As an EE major, you'll be...

Some of my colleagues and I captured the i_D vs V_ds/V_sd curves for the CD4007 MOSFET IC (http://www.ti.com/lit/ds/symlink/cd4007ub.pdf). We did this for the NMOS and PMOS transistors. I have attached the curves to this post. The NMOS curve is as expected. However, the PMOS curve seems to be...

Yes, thank you @analogdesign ! :D

Would you still have to pay for the SPICE models even if you purchased a proprietary simulator, or would they come packaged with them? Okay, so even if you could get an open source simulator to work as well as HSPICE or other tools, you'd need to convince the foundry as well. Is this correct?

Nothing specific. This was more a question out of intellectual curiosity. :) So, the foundry models won't run on open source tools?

So, if I understand correctly, the SPICE models (which I presume are provided by the foundries, but correct me if I'm wrong) incorporate the newer device physics present in cutting edge processes. However, the tools themselves also have features that allow you to simulate things that you just...

For a traditional circuit simulator, like the free and open source versions of SPICE (i.e. ngspice), it seems to me that they can technically all simulate the same kinds of circuits. Assuming you had a portable SPICE model (either written in SPICE or compiled with ADMS), you could simulate the...

Suppose I have some sort of a filter, whose transfer function is given by H(w), where w is the angular frequency of the input signal in radians per second. I want to know the maximum value of the transfer function. If I solve for the resonant frequency w0, which from my understanding is the...

Thank you very much! I understand what the issue is now. logz is multivalued. So, though the limits of integration are the same, each results in two different values of the antiderivative. So, the result 2*pi*I is still recovered. :)

This question deals specifically with complex analysis. Let C be the unit circle in the complex plane (|z| = 1). If you calculate the contour integral of (1/z)dz over C using Cauchy's Integral Formula, you get 2*pi*i. If you calculate it using the path z(t)=e^(it), t in [0,2pi], you also...

Hey, guys! I was recently reading (attempting) about spin groups. I heard a little bit about SO(3), but still don't know much. I was wondering if someone could explain what a spin group is and why it is useful? Is there some way to visualize spin groups? Please note: I know literally nothing...

That's true. But if you take the potential at the center of the sphere, it changes because you now have a field inside the sphere. Inside the sphere at a certain radial distance from the center, you enclose charge, and, by Gauss's Law, you will have a field. Therefore, you will still gain...