​ Gauss's Law This is the electric field flux With a uniform charge density that is much more wide and long than it is thick you can use the following: So as you progress upwards from 0 the flux increases. Gathering up terms and using Gauss's law: Now Read more…
In the Pao-Sah charge model of the MOSFET the diffusion term cancels out. This should not be a huge surprise because there is no dissimilar semiconductor junction. Current is constant along the channel so let's treat it like a resistor while again ignoring any gate structure. The old fashioned formula Read more…
What is a MOSFET but a plain old block of silicon with some terminals printed on it. I start here with the most basic of components. Here are the relevant points: I want to think about N channel MOSFET so I start with P type material doped at Na=10^16 cm^-3 Read more…
Research Links SPICE manual with math functions Expressions can contain the following: Node voltages, e.g., V(n001) Node voltage differences, e.g., V(n001, n002) Circuit element currents; for example, I(S1), the current through switch S1 or Ib(Q1), the base current of Q1. However, it is assumed that the circuit element current is varying quasi-statically, Read more…
​ This assignment was very difficult to finish because the lab had only one measurement device and the other teams were taking 3 to 4 days to figure out how to use it. Lab Assignment extraction_ MOSFET_ parameters Unambiguous Extraction of Threshold Voltage Spice Files to dry lab this Read more…
The gotcha here appears to be that you must have a particular type of voltage source – (Behavioral) stuck in where your control current is. See the attached LTSpice file for an example. Current Controlled Current Source Example Circuit
The results of this project are probably wrong. However SPICE and the Schmitt trigger circuit are all set up in the archive. If you find errors in the analysis or get better results somehow please come back and leave a comment detailing the error or linking out to your better Read more…
This course was notable mainly for Marcio Schneider who has extremely clear Portuguese and a gift for explaining complex topics. His explanation of diode / PN junction being all about the diffusion current was very good. Marcio Schneider Introduction to Semiconductors PN Junctions Diode Circuits Bipolar Junction Transistors MOSFETS
Research Links Cmos Analog Design Using All Region MOSFET Modeling Um Modelo do transistor MOS para projeto de cirdcuitos itegrado The class taught by the author is centered around the ability to scale MOSFET's across technologies using normalization. This is typified by the second question on the test given Read more…