Common-Emitter Amplifier Simulation

flux

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:
VB=12×2.2k10k+2.2k≈2.16VV_B = 12 \times \frac{2.2k}{10k + 2.2k} \approx 2.16V
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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U3
U2
U2 V_BCKP - U1 RXD0/IO3
U3 GND - U4 VSS
U2 VCC - U1 TXD0/IO1
U3 VOUT - U4 OUT_1
U4 OUT_2 - U2 VDDUSB
U2 RXD1 - U2 SCL2
U3 VIN - U4 IN
U3 VIN - U4 IN
U4 OUT_2 - U2 VDDUSB
U2 V_BCKP - U1 RXD0/IO3
U4 OUT_2 - U2 VDDUSB
U3 GND - U4 VSS
U3 VOUT - U4 OUT_1
U3 GND - U4 VSS
U4
U2 VCC - U1 TXD0/IO1
U4 BAT_2 - U2 RSVD_17
U1
U2 RXD1 - U2 SCL2
U4 BAT_2 - U2 RSVD_17
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5G tracking device thumbnail
5G tracking device

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