2020-09-15 18:18:13 +02:00
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* simple differential pair with simple common-mode feedback
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.model n1 nmos level=49 version=3.3.0 tox=3.5n nch=2.4e17 nsub=5e16 vth0=0.6
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.model p1 pmos level=49 version=3.3.0 tox=3.5n nch=2.5e17 nsub=5e16 vth0=-0.7
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.subckt diffpair inp inn outp outn setcm vdd vss
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Mp1 outp cmfb vdd vdd p1 W=7.5u L=0.35u pd=13.5u ad=22.5p ps=13.5u as=22.5p m=4
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Mp2 outn cmfb vdd vdd p1 W=7.5u L=0.35u pd=13.5u ad=22.5p ps=13.5u as=22.5p m=4
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Mpcm cmfb cmfb vdd vdd p1 W=7.5u L=0.35u pd=13.5u ad=22.5p ps=13.5u as=22.5p m=2
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Mncm cmfb setcm tail vss n1 W=7.5u L=0.35u pd=13.5u ad=22.5p ps=13.5u as=22.5p m=4
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Mn1 outn inp tail vss n1 W=7.5u L=0.35u pd=13.5u ad=22.5p ps=13.5u as=22.5p m=8
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Mn2 outp inn tail vss n1 W=7.5u L=0.35u pd=13.5u ad=22.5p ps=13.5u as=22.5p m=8
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*bias
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Mn0 tail bn vss vss n1 W=7.5u L=0.35u pd=13.5u ad=22.5p ps=13.5u as=22.5p m=4
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Mnn bn bn vss vss n1 W=7.5u L=0.35u pd=13.5u ad=22.5p ps=13.5u as=22.5p m=4
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Ib vss bn 1u
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.ends
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Xdiff inp inn outp outn setcm vdd vss diffpair
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Cload outp outn 100f
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2020-10-02 18:40:25 +02:00
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:balun:Balun1 outp outn outcm outdiff
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:balun:Balun1 inn inp incm indiff
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2020-09-15 18:18:13 +02:00
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Vprobediff outdiff indiff DC 0
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Vprobecm outcm incm DC 0
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Vset setcm vss DC 1.1
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Vvdd vdd vss DC 3.3
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Vvss vss 0 DC 0
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2020-10-02 18:40:25 +02:00
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.control
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loop vprobediff dec 10 1 10e9 name="diffloop"
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loop vprobecm dec 10 1 10e9 name="cmloop"
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.endc
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