Chapter 4 problems

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4.20

  • We want to establish a DC operating point for the BJT. Writing a loop equation gives us -VBB-Vin(t)+iBRB+vBE=0. To form a load line, we will let vin(t)=0 & iB=0. Thus vBE=VBB+vin(t) and iB(t)=(VBB+vin(t))/RB
  • V_{in}=-0.2, 0, 0.2 for the minimum, Q-point and maximum values.
v_{in} V V_{BE} V i_B uA
-.2 .45 2
0 .58 5
.2 .62 10
  • Writing a loop equation for the output: -V_{CC}+R_CI_C+V_{CE}=0.
v_{in} V V_{CE} V i_C mA
-.2 19 .8
0 16 2
.2 12 4
  • A_v \cong (19-12)/.4=12.5

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