ElectronicsI_L1 - Electronics I 16.365 Prof. Joel Therrien...

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
Electronics I 16.365 Prof. Joel Therrien Ball Hall 319
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
What will be covered • Amplifiers, Diodes, and Transistors: theory and applications • These devices will be studied on four levels: – Device Physics – Current-Voltage Characteristics – Functional Circuits • Practical applications of amplifiers (Design project)
Background image of page 2
Important Info Course Website http://faculty.uml.edu/jtherrien (go to courses) Office Hours • Monday 12:30-2 • Wednesday 12:30-2 • IM (j- therrien@hotmail.com ) • But don’t send email to there, I don’t check it very often at all, use Joel_Therrien@uml.edu instead
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Operation: Eliminate Troll • The service project for this semester involves retrofitting the lock on the Lowell canal. • Boat guide can’t open the lock so they need a person on the bank there to open it. • We will replace this setup with a remote control lock opener • Details are in the syllabus
Background image of page 4
Semiconductors
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Physics of Semiconductors • Semiconductors are a class of materials that have unique properties, somewhere between that of a conductor like gold and that of an insulator, like glass (which is why the are called semi -conductors) • The nature of their properties lies in the unique way that electrons behave inside them. • Now there are many kinds of semiconductors, but we will focus on silicon because it is the most prevalent. • All of the semiconductors will follow the general rules we will lay out here A few more semiconductors: Germanium, Gallium Arsenide, Indium Nitride, Diamond, some polymers…
Background image of page 6
A Little Chemistry • Recall that in chemistry, there are three common types of bonds: – Ionic: One atom captures an electron from another, creating ions. – Metallic: Electrons are loosely held by the atoms, but no other atoms nearby have a stronger affinity. – Covalent: Similar to ionic in that one atom takes an electron from another, but the electrons are not tightly bound to one atom. Instead they are shared between just two atoms. • We have the beginning of a dichotomy: – Semiconductors are useful because the do conduct electricity – Yet what makes them more useful than metals is that they have some properties of insulators!
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
• Here is how to go from an insulator made of covalent bonds to a conductor: – We need to add enough energy to the bond to cause one of the electrons to break loose – This electron can then travel through the crystal slowed only by scattering off the atoms (imagine trying o run through a dense forest). – The positive charge left over by the electron’s departure can also move! It acts just like an electron, but has a positive charge. We call it a hole, can you guess why? Si
Background image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 20

ElectronicsI_L1 - Electronics I 16.365 Prof. Joel Therrien...

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online