33 lines
1.2 KiB
Plaintext
33 lines
1.2 KiB
Plaintext
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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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Balun1#balun outp outn outcm outdiff
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Balun1#balun inn inp incm indiff
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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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