why the input impedance of on-chip balun is not correct?
时间：04-04
整理：3721RD
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Hello,
I designed a 2:2 turn ratio transformer balun in HFSS, with 50 ohm resistance for each of three lumped ports, working at 16GHz. The results shows that S21 and S31 is about -4.5dBm, which is normal.
But the Re(Z22）=6 ohm, which is too low. I have tried to set a differential port, but the real part of the differential impedance is still not correct. It doen not reflect the impedance on the other side of the balun.
Because the transformer balun's turn ratio is 1:1, I think the differential impedance should be 40~50 ohm.
Could anyone please point out what am I doing wrong with the simulation?
Thans a lot.
I designed a 2:2 turn ratio transformer balun in HFSS, with 50 ohm resistance for each of three lumped ports, working at 16GHz. The results shows that S21 and S31 is about -4.5dBm, which is normal.
But the Re(Z22）=6 ohm, which is too low. I have tried to set a differential port, but the real part of the differential impedance is still not correct. It doen not reflect the impedance on the other side of the balun.
Because the transformer balun's turn ratio is 1:1, I think the differential impedance should be 40~50 ohm.
Could anyone please point out what am I doing wrong with the simulation?
Thans a lot.
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