3212 11 j p c h e n 1 using simple constant voltage

This preview shows page 11 - 20 out of 31 pages.

3/2/12 11 J. P C h e n 1. Using simple constant-voltage drop model, assuming irresp ective of the exact value of currents. 3. Assuming the device operates at the active region, we can apply the relationship between IB, IC, and IE, to determine the voltage VCE or VCB. 4. Check the value of VCE or VCB , if i. VBE>0.7V and VC > VB , the assumption is correct. ii. VBE>0.7V and VC < VB , the assumption is incorrect. iii. It means the BJT is operating in saturation region. Thus we s hall assume VCE = VCE(sat) (0.2~0.3V) to obtain IC . Here th e common emitter current gain is defined as forced = IC/IB , we will find forced < . DC Analysis Steps V v BE 7 . 0
Image of page 11

Subscribe to view the full document.

3/2/12 12 J. P C h e n Example For =100, find terminal currents and voltages.
Image of page 12
3/2/12 13 J. P C h e n Example =100 0.7 ! BE v V =
Image of page 13

Subscribe to view the full document.

3/2/12 14 J. P C h e n Example
Image of page 14
3/2/12 15 J. P C h e n Example
Image of page 15

Subscribe to view the full document.

3/2/12 16 J. P C h e n Example
Image of page 16
3/2/12 17 J. P C h e n Example
Image of page 17

Subscribe to view the full document.

3/2/12 18 J. P C h e n Conceptual Circuits Small-signal equivalent circuit models Application of the small-signal equivalent circui t models Augmenting the hybrid π model. The Transistor as an Amplifier
Image of page 18
3/2/12 19 J. P C h e n The Concept of Signal Amplification The signal to be amplified is usually time- variable. The essence of amplification is the control and conversion of energy The characteristics of amplification is power amplification The component that can control energy is necessary, e.g. BJT and MOS
Image of page 19

Subscribe to view the full document.

Image of page 20
You've reached the end of this preview.
  • Fall '10
  • ChengJianping
  • Transistor, Bipolar junction transistor, Electronic amplifier, Input Resistance, Early effect

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    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.

    Student Picture

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

  • Left Quote Icon

    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.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    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.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern