tec5c
Newbie
Hi all,
I am trying to design a Marchand balun (20GHz - 40GHz) using AWR Microwave Office. The process (PDK) that I am using is IHP 0.25um SiGe BiCMOS.
My simple design is close to the required specifications though S11 is not matched for the center frequency (30GHz), it is currently matched for 38GHz. Also, the phase balance is around 4 degrees, when I require it to be at 2 degrees. The low frequency end performance is quite poor too, though I assume this is due to the design being matched at 38GHz instead of 30GHz.
My questions are, what characteristics of the microstrips effect these parameters (S11 mainly)? The best results I have obtained so far have been with using tightly edge coupled lines.
Any help is appreciated.
I am trying to design a Marchand balun (20GHz - 40GHz) using AWR Microwave Office. The process (PDK) that I am using is IHP 0.25um SiGe BiCMOS.
My simple design is close to the required specifications though S11 is not matched for the center frequency (30GHz), it is currently matched for 38GHz. Also, the phase balance is around 4 degrees, when I require it to be at 2 degrees. The low frequency end performance is quite poor too, though I assume this is due to the design being matched at 38GHz instead of 30GHz.
My questions are, what characteristics of the microstrips effect these parameters (S11 mainly)? The best results I have obtained so far have been with using tightly edge coupled lines.
Any help is appreciated.