MID SEM a

The circuit is a common-emitter (CE) amplifier with voltage divider bias and partially bypassed emitter resistance. The purpose of the emitter resistance is to improve the bias stability but it decreases the gain of the common-emitter amplifier. With the emitter resistance shunted with a capacitor, bias stability is retained while avoiding reduction in AC gain. Partial bypassing allows AC feedback through the unbypassed portion of the emitter resistance. The overall gain of the circuit is approximately 5. Switch to DC Op to see the quiescent voltages and currents.