Lab 6 - EE 420L - Single-Stage Transistor Amplifiers

Jonathan K DeBoy
deboyj@unlv.nevada.edu
2 March 2015

Pre-lab work

 

Introduction

This lab served as an introduction to the different types of single stage transistor amplifiers. By the end of the lab, we will be able to qualitatively and quantitatively describe how each cLab6-1NRi.jpgonfiguration operates.

Experiment 1 - Source Follower

 

fig1.jpgCD_sims.JPG

Ro:

 fig1.jpg
We used the same Ro for almost all the circuits since we can assume that no current flows through the gates.
Rout: We put a resistor in paralllel to R2 and and R 7 that is euqla to the output resistance to show a 50% voltage drop.
NMOS                                                                                                               PMOS
fig1.jpg    
Rout^
Gain:
CS_Gain.JPG                                                                     CS_Gain_p.JPG
     
We had a gain of 1 for our source follower amplifiers.


Experiment 2 - Common Source


fig7.jpgCS_sims.JPG

We used the same Rin for almost all the circuits since we can assume that no current flows through the gates.
Rout: We put a resistor in paralllel to R2 and and R6 that is equal to the output resistance to show a 50% voltage drop.
Gain:
CS_Gain.JPG                                                    CS_Gain_p.JPG
     
We had a gain of 1 for our source follower amplifiers.

Experiment 3 - Common Gate

 

fig1.jpgCS_sims.JPG

We used the same Ro for almost all the circuits since we can assume that no current flows through the gates.
Rout: We put a resistor in paralllel to R2 and and R6 that is equal to the output resistance to show a 50% voltage drop.
Gain:
CS_Gain.JPG                                                              CS_Gain_p.JPG
     
We had a gain of 1 for our source follower amplifiers.

Experiment 4 - Push Pull


fig4.jpgCG_sims.JPG
CG_Gain.JPG                                                                                 CG_Gain_p.JPG
     
At first using, using a resistor of 100k had too much gain for our 10mV input voltage so we decresed the resistance to allow for a lower gain on the right..

Conclusion


We analyzed and used different types of single stage amplifiers in a way that we can inject them into a practical purpose such as an audio amplifier.
 
 
 
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