Simulation of an LC oscillator based on the Kolpits scheme
This example shows the implementation of a Colpits oscillator circuit with a nominal frequency of 9 MHz. The oscillation frequency is given by the formula:
LC oscillators have good frequency selectivity due to higher Q-factor levels compared to RC oscillators.
Model diagram:
Defining the function to load and run the model:
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function start_model_engee()
try
engee.close("lc_oscillator", force=true) # closing the model
catch err # if there is no model to close and engee.close() is not executed, it will be loaded after catch.
m = engee.load("$(@__DIR__)/lc_oscillator.engee") # loading the model
end;
try
engee.run(m) # launching the model
catch err # if the model is not loaded and engee.run() is not executed, the bottom two lines after catch will be executed.
m = engee.load("$(@__DIR__)/lc_oscillator.engee") # loading the model
engee.run(m) # launching the model
end
end
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Running the simulation
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try
start_model_engee() # running the simulation using the special function implemented above
catch err
end;
Writing from simout to voltage signal variables:
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res = collect(simout)
V = collect(res[1])
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Visualization of simulation results
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using Plots
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plot(V[:,1], V[:,2], label="Voltage, V", linewidth=2, title="LC Oscillator voltage")
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plot(V[:,1], V[:,2], label="Voltage, V", linewidth=2, xlim=(4e-5, 4.1e-5), title="LC oscillator voltage for 1 microsecond")
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