Hi, I did the simulation QPSS and QPSP replacing the varactor for a capacitor. On article have an information that says when VDC = 3V, the varactor has a capacitance 30pF. Then the results were better, but its still not correct. I think it the varactor model is wrong, but the manufacturer offers only that spice model. Input.scs: // Generated for: spectre // Generated on: Sep 27 09:57:10 2016 // Design library name: TCC2 // Design cell name: circulador_2_TB // Design view name: schematic simulator lang=spectre global 0 parameters C1=300p C2=30p Cc=5.6p Cdcb=10u Fm=15M Frf=170M L1=270n L2=27n \ Lc=1u Lrfc=2.7u phi=120 Vdc=3.00 Vm=0.6 include "/usr/local/IC614/tsmc13/tsmc13rf/../models/tsmc13rf.scs" // Library name: TCC2 // Cell name: circulador_2 // View name: schematic subckt circulador_2 Porta1 Porta2 Porta3 Porta4 Porta5 Porta6 L14 (net30 Porta6) inductor l=Lrfc L13 (net33 0) inductor l=L1 L12 (net27 Porta3) inductor l=Lc L11 (net27 net32) inductor l=L2 L10 (net36 net27) inductor l=L2 L9 (net24 Porta5) inductor l=Lrfc L8 (net34 0) inductor l=L1 L7 (net21 Porta2) inductor l=Lc L6 (net21 net35) inductor l=L2 L5 (net38 net21) inductor l=L2 L4 (net18 Porta4) inductor l=Lrfc L3 (net15 Porta1) inductor l=Lc L2 (net31 net15) inductor l=L2 L1 (net15 net39) inductor l=L2 L0 (net37 0) inductor l=L1 C11 (net30 net31) capacitor c=C1 C12 (net18 0) capacitor c=C2 C10 (net30 net33) capacitor c=Cdcb C9 (net32 net30) capacitor c=C1 C8 (net27 Porta3) capacitor c=Cc C7 (net24 net36) capacitor c=C1 C13 (net24 0) capacitor c=C2 C6 (net24 net34) capacitor c=Cdcb C5 (net35 net24) capacitor c=C1 C4 (net21 Porta2) capacitor c=Cc C14 (net30 0) capacitor c=C2 C3 (net15 Porta1) capacitor c=Cc C2 (net18 net37) capacitor c=Cdcb C1 (net18 net38) capacitor c=C1 C0 (net39 net18) capacitor c=C1 ends circulador_2 // End of subcircuit definition. // Library name: TCC2 // Cell name: circulador_2_TB // View name: schematic I0 (net2 net3 net4 net1 net1 net1) circulador_2 V0 (net1 0) vsource dc=Vdc type=dc PORT1 (net3 0) port r=50 type=sine freq=Fm ampl=Vm sinephase=1*phi \ freq2=Frf dbm2=0 sinephase2=0 fundname="Modulation" fundname2="RF" PORT2 (net4 0) port r=50 type=sine freq=Fm ampl=Vm sinephase=-1*phi \ freq2=Frf dbm2=0 sinephase2=0 fundname="Modulation" fundname2="RF" PORT0 (net2 0) port r=50 type=sine freq=Fm ampl=Vm sinephase=0*phi \ freq2=Frf dbm2=0 sinephase2=0 fundname="Modulation" fundname2="RF" simulatorOptions options reltol=1e-3 vabstol=1e-6 iabstol=1e-12 temp=27 \ tnom=27 scalem=1.0 scale=1.0 gmin=1e-12 rforce=1 maxnotes=5 maxwarns=5 \ digits=5 cols=80 pivrel=1e-3 sensfile="../psf/sens.output" \ checklimitdest=psf qpss qpss flexbalance=yes oversample=[1 1] funds=["Modulation" + "RF"] maxharms=[3 3] errpreset=conservative annotate=status qpsp qpsp start=140M stop=300M portharmsvec=[0 0 0 0 0 0] + ports=[PORT0 PORT1 PORT2] annotate=status modelParameter info what=models where=rawfile element info what=inst where=rawfile outputParameter info what=output where=rawfile designParamVals info what=parameters where=rawfile primitives info what=primitives where=rawfile subckts info what=subckts where=rawfile saveOptions options save=allpub] Results: At one frequency range, the S11 is lower than S21 and S31, but the device is behaving like a power divider (S21 = S31) and not like a circulator. Regards, Eduardo.
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