0

Frequency Response for MOSFET/BJT

The frequency response of a BJT or MOSFET can be found using nearly the exact same process, with the only variations being caused by a single resistor and simple naming conventions that differ between the two devices. Before we start let’s think a little bit about what we’re doing: Our goal is going to be [...]

  • Share/Bookmark

Tags: , , , , , , , , , ,

 
0

BJT Circuit and Symbol Conventions

The following is an explanation of symbol conventions , voltage polarities and current directions for npn and pnp BJTs. The goal is to help understand these characteristics but not on the physical level of electrons and holes. The following figure shows practical operation of each BJT in the active mode. npn or pnp? When looking [...]

  • Share/Bookmark

Tags: , , , , , , , , ,

 
0

BJT Transistor Nodal Analysis

Posted by Luke on Apr 16, 2010 in Basic Electrical Engineering Concepts, Electronics, Physics

Basic BJT Equations: It is also important to know that can be modeled as . These equations are not very informative by themselves so a few examples are demonstrated below. In both examples we will assume is very large. What this means for our calculations is . Since we also assume that . Finding missing [...]

  • Share/Bookmark

Tags: , , , , , , , , , , , ,

 
0

Calculating Electron and Hole Concentrations in a p-n Junction

Sometimes it can be complicated understanding and calculating hole and electron concentrations. My intent in this article is to briefly, but thoroughly describe what the variables used in these calculations mean and how to use them. To begin I will introduce our variables: concentration of free electrons (donors) concentration of holes (acceptors) = number of [...]

  • Share/Bookmark

Tags: , , , , , , , , , , , , ,

 
1

Amplifiers – Part I

This post is about amplifiers, how they work, and common applications. I will cover several operational amplifier configurations, and situations where each might be useful. This is part I of II for general discussion about amplifiers. Enjoy! Amplifiers Definition (for Bioinstrumentation): Circuit that makes a small signal, usually voltage but occasionally current or power, big [...]

  • Share/Bookmark

Tags: , , , , , , , , , , , , , , , , , ,

ballssmall

Copyright © 2010 EngineerSphere.com All rights reserved .
Sitemap      Electrical Engineer