UNIT II

MULTI STAGE AMPLIFIERS : 
Multi Stage Amplifiers,  Methods of Inter Stage Coupling, Analysis of n – Stage Cascaded Amplifier, Miller’s Theorem, High Input Resistance Transistor Circuits,  Cascode Transistor Configuration

REFERENCE BOOKS :

1.       Integrated Electronics – J. Millman and C.C. Halkias, McGraw-Hill, 1972.
2.       Micro Electronic Circuits – Sedra A.S. and K.C. Smith, Oxford University Press, 5th ed.
3.       Electronic Devices and Circuits - Theodore F. Bogart Jr., J. S. Beasley and G. Rico, Pearson  
          Edition,  6th Edition, 2004.
4.       Electronic Circuit Analysis and Design – Donald A. Neaman, McGraw Hill  


LECTURE  NOTES :




ASSIGNMENT - I (Theory) :



ASSIGNMENT - II (Problems) :



Previous JNTU Questions :

1. Compute the values of overall current gain and input impedance of a Darlington pair with 1K Ω emitter

resistance connected to the emitter of second transistor if hfc  , hic , hoc and hrc of both the transistor are given

as -51, 1.1K Ω , 0 and 1 respectively.

2. List the salient features of cascade and Darlington pair amplifiers.

3. Differentiate between direct and capacitive coupling of multiple stages of amplifiers.  

4. With the help of a neat circuit diagram, describe the working of a cascode amplifier. 

5. What are the merits and demerits of a cascade amplifier over a simple Common Emitter amplifier? 

6. (a)  Derive the expression for the bandwidth  of multistage  amplifier. 

   (b)  What  are the problems of Direct coupled amplifiers?

          (c) Why RC coupling is popular?

          (d)  Why  transformer   coupling  is not  used  in  the  initial  stage  of a  multistage amplifier? 

7.   Write expression for overall lower and higher cut-off frequencies for an n-stage identical amplifier

     cascaded setup in terms of the individual lower and higher cut off frequencies. 

     Reduce the expressions for n = 2.

Previous GATE Questions :