Design a Single stage RC coupled amplifier using FET BFW-11 biased to provide 3.5mA to achieve voltage gain of 10, lower cut of frequency of 20 Hz and to provide Vo=2.5V.
1 Answer
  • We know the gain of a BJT transistor given y the formula


  • Hence the Output Voltage is the product of Gain and Input Voltage


  • We know the Stability factor for a BJT transistor is given as


  • From data sheet of BJT147B transistor we have Gain value of 150 to 460
  • We can take gain value as 150 here





  • Let$V_{cc}=10V;V_{CE}=4V;I_C=10mA$
  • The Collector current is product of Current gain and Base current


$I_b=\dfrac{{2\times 10^{-3}}}{{150}}=0.01mA$   

  • We know that by applying in Collector Emitter junction we have





  • By ohms law the Base voltage is given by

$V_B=I_C\times R_L=2V$

  • By voltage division we have the base voltage as





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