34 lines
646 B
Plaintext
34 lines
646 B
Plaintext
Vackar's Oscillator Circuit
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* Vackar is a derivation of Colpitt's oscillator (LC based).
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* Oscillation is taken on node 4.
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* Predicted frequency is 1.91803e+06Hz.
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* Models:
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.model qnl npn(level=1 bf=80 rb=100 ccs=2pf tf=0.3ns tr=6ns cje=3pf cjc=2pf va=50)
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vcc 1 0 5 pwl 0 10 1e-9 5
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lrfc 1 2 100u
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cdec 2 0 7n
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q1 3 2 0 qnl
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rb 3 0 4700
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c1 3 4 100p
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c2 3 0 600p
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c0 4 0 1n
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l1 4 1 6.2u
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.control
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tran 10n 20u
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plot v(4)
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linearize v(4)
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fft v(4)
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set xbrushwidth=3
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plot mag(v(4)) xlimit 0 10Meg
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let maxfft=mag(v(4))
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meas sp fosc MAX_AT maxfft from=1Meg to=10Meg
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reset
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pss 1.8e6 10e-6 4 1024 10 50 5e-3 uic
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plot v(4) xlimit 0 10Meg
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.endc
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.end
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