1.  DESIGNING

Selection of transistor: Use high frequency transistor BF195, NPN transistor.

 

 

Applying KVL for the output loop

V_CC = I_CR_C+V_CE+I_E R_E = I_C R_C + V_CE +V_{E                             There for} 

                                                    There for   

 

 Applying KVL for the output loop

 V_CC = I_CR_C+V_CE+I_ER_E = I_CR_C+V_CE+V_E          there for 4.7k

                            = 1.2 k

Let I_R1  21I_B          and  I_R2 = 20 I_B

i.e 

Design of feedback network :

 Selection of capacitors  :  All capacitor values may be taken 1μF

Effective capacitor C_e=2.5nF

There for C= 5nF

 

 

Result

     Amplitude and frequency of sine wave from Colpitts Oscillator =…….....V, ............Hz.