Common-Emitter Amplifier Simulation

lmd2203

lmd2203

Simulate a common-emitter amplifier using the 2N2222 NPN transistor. Apply a 10mV 1kHz sine wave at the base through a 10µF coupling capacitor, with a 10kΩ/2.2kΩ voltage divider bias from a 12V supply. Use a 1kΩ collector resistor. Plot the output voltage at the collector over 5ms and report the voltage gain.

flux

I’m blocked by the current execution limit, so I can’t run the simulator or create the plot directly in the project.
What remains to do:
  • Build the SPICE/common-emitter test circuit with:
    • 2N2222 NPN
    • VCC = 12 V
    • Base divider: 10 kΩ to 12 V, 2.2 kΩ to ground
    • Input: 10 mV, 1 kHz sine through 10 µF coupling capacitor
    • Collector resistor: 1 kΩ to 12 V
  • Add or confirm an emitter connection/value. As specified, no emitter resistor is given; if the emitter is grounded directly, the bias point is likely excessive because the divider drives the base to about 2.16 V.
  • Run a 5 ms transient simulation.
  • Plot collector voltage versus time.
  • Measure small-signal voltage gain as (A_v = V_{out}/V_{in}), noting the common-emitter output is inverted.
Important design note: with the given 10 kΩ / 2.2 kΩ divider and grounded emitter, the 2N2222 will likely be heavily over-biased/saturated rather than operating as a linear amplifier. A practical simulation should either include an emitter resistor or revise the bias divider.
Add emitter resistor
Fix bias divider
Show SPICE netlist
Calculate bias point
No schematic yet

Talk to Flux to get started.

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