23 lines
658 B
Plaintext
23 lines
658 B
Plaintext
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* Simple generic single-pole OpAmp model
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* Parameters are pole frequency, gain, offset, output resistance.
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* the output is limited to the supply voltage
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* Author Holger Vogt, Public Domain
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.subckt genopa1 in+ in- vcc vee out params: POLE=20 GAIN=20k VOFF=10m ROUT=10
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* add offset voltage
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Voff in+ inoff dc {VOFF}
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* gain stage with RC pole
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G10 0 int inoff in- 100u
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R1 int 0 {GAIN/100u}
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C1 int 0 {1/(6.28*(GAIN/100u)*POLE)}
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* output decoupling, output resistance
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Eout 2 0 int 0 1
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Rout 2 out {ROUT}
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* output limited to vee, vcc
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Elow lee 0 vee 0 1
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Ehigh lcc 0 vcc 0 1
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Dlow lee int Dlimit
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Dhigh int lcc Dlimit
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.model Dlimit D N=0.01
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*
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.ends
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