diode circuit example, dc analysis
* a line that begins with a * is a comment in Spice
*
* set width of printed output to 80 columns
.width out=80
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rs 2 3 135.78
r1 4 0 709.2
ro 3 5 311.5
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* when specifying a diode, we also need to specify a model
* that describes the diode.  in this case, the model name is m1
*
d1 5 6 m1
d2 6 7 m1
d3 7 0 m1
d4 1 2 m1
d0 3 4 m1
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* specify the dc power supply
*
vsup 1 0 dc 3
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.model m1 D(is=1.0e-12 n=1.05 cjo=10p m=0.5 vj=0.8 )
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* request an operating point analysis from Spice
*
.op
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* request an ac analysis over 5 decades in frequency
*
*
* specify printed output (ac voltage across the diode)
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.print ac v(2,0)
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* make a plot of the ac voltage across the diode vs. frequency
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*
* must have an .end line
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.end