Electronics-I Lecture 31

# Electronics-I Lecture 31 - CEAmplifierwithRe...

This preview shows pages 1–4. Sign up to view the full content.

Lecture 31 Electronics I 1 CE Amplifier with R e Adding R e  leads to  significant changes  in amplifier  characteristics Amplifier T Model  with r o r o  is large it can be  eliminated with little  effect on amplifier  performance

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

View Full Document
Lecture 31 Electronics I 2 CE Amplifier with R e Input Resistance R in    R in  = R || R ib   R ib    v i /i b i e  = v i  /(r e  + R e ) i b  = i e (1 -  α )= i e /(1+ β ) i b  = v i  /[(r e  + R e ) (1+ β )]   R ib  = v i /i (replace i b )         = (r e  + R e )(1 +  β ) Input resistance is (1 +  β times the total resistance  in the emitter Multiplication by a factor  of (1 +  β ) is known as  resistance-reflection rule
Lecture 31 Electronics I 3 CE Amplifier with R e Including R e  substantially  increases R i R ib  (with R e )/R ib  (without  R e The designer can select  R e  to control the value  R

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

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern