Common-Emitter Amplifier Simulation
Thought for 2 sec
I’m blocked from running the simulation because this session has no remaining execution credits, so I can’t call the simulator or inspect/update the project.
What remains:
- Build the 2N2222 common-emitter test circuit with:
- VCC = 12 V
- Base bias divider: 10 kΩ to 12 V, 2.2 kΩ to GND
- Input: 10 mV, 1 kHz sine through 10 µF coupling capacitor into base
- Collector resistor: 1 kΩ to 12 V
- Emitter reference: needs confirmation — if omitted, emitter is grounded
- Run a transient simulation for 5 ms.
- Plot collector voltage versus time.
- Measure small-signal gain as (A_v = V_{out}/V_{in}), using collector AC amplitude divided by 10 mV input amplitude.
One important note: with the requested divider and emitter grounded, the base bias is approximately:
That heavily forward-biases the base-emitter junction and likely drives the 2N2222 into saturation unless base current is limited by the divider impedance. The collector DC voltage may sit very low, so the amplifier may clip and the linear voltage gain may not be meaningful. A proper common-emitter amplifier usually needs an emitter resistor and/or adjusted bias so the collector sits near mid-supply.
Add emitter resistor
Bias near midsupply
Simulate grounded emitter
Calculate bias values
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