Shown in Figure P10.34 is a common-emitter amplifier stage implemented with an npn silicon transistor and a single DC supply VCC = 12 V. Determine VCEQ and the mode of operation.
? = 130 RB = 325 k?
RC = 1.9 k? RE = 2.3 k?
Ro = 10 k? RS = 0.5 k?
vS = 1 cos(6.28 × 103t) mV
The "DC-blocking" or "AC coupling" capacitors act as open circuits for DC; therefore, the signal source and load can be neglected since this is a DC problem. Specify directions of current and polarities of voltages. Assume the transistor is operating in its active region; then, the base-emitter junction is forward biased. The base and collector currents both flow through the collector resistor in this circuit.
The collector-emitter voltage is greater than its saturation value (0.3 V for Silicon). Therefore the initial assumption (operation in the active region) was correct and the solution is valid.
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