The circuit shown in Figure P10.31 is a common-emitter amplifier stage. Determine the DC Thèvenin equivalent of the network between the base node and the reference node. Use it to redraw the circuit.
VCC = 20 V ? = 130
R1 = 1.8M? R2 = 300 k?
RC = 3 k? RE = 1 k?
Ro = 1 k? RS = 0.6 k?
vS = 1 cos(6.28 × 103t) mV
Analysis:
Extracting the part of the circuit specified, the Thèvenin equivalent voltage is the open circuit voltage. The equivalent resistance is obtained by suppressing the ideal independent voltage source:
Note that must remain in the circuit because it supplies current to other parts of the circuit:
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