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25 lines
492 B
25 lines
492 B
baker-252 enhanced
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* simple noiseless opamp with RC feedback
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* compare E source and code model gain stage
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* ngspice-40+ required
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.control
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set sqrnoise
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noise V(vout) Vplus dec 100 1 1000G
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print all
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noise V(vouta) Vplusa dec 100 1 1000G
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print all
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.endc
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Vplus Vplus 0 dc 0 ac 1
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Rf vout vminus 100k
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Cf vout vminus 1000p
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Eopamp vout 0 vplus vminus 100Meg
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Vplusa Vplusa 0 dc 0 ac 1
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Rfa vouta vminusa 100k
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Cfa vouta vminusa 1000p
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a1 %vd(vplusa, vminusa) vouta amp
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.model amp gain(gain=1e8)
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.end
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