tonyctsiu
Member level 1
Dear All,
I am trying to design a circuit using TI's CC1110. I am going to follow the TI's reference design for the balun.
The output impedance of the CC1110 at 915 mHZ is a differential complex impedance 86.5+j43. I have to then convert it into an unbalanced 50ohm port with a series of low pass filter and notch filter. The 50ohm output is headed to a SMA connector.
I have network analyzer and spectrum analyzer in my school laboratory. Can anyone suggest a practical method to verify the followings after the fibrication of PCB?
1. The network is matching properly.
2. The harmonics is supressed into an acceptance level
For the requirement 1 above, the difficulty is that I don't know how to use VNA to verify a differential output. Do I need a 4 port or 3 port VNA to do the job? Or do I need some kind of differential probe (if it exists)? Also the RF port of the CC1110 is just 2 pin of a QFN package. How can I probe it with a network analyzer?
For the requirement 2 above, can I just connect the SMA connector of my PCB to a spectrum analyzer to do the checking?
Do I need any other equipment to do the job?
Thanks for giving me directions!
Thank you and regards,
Tony
I am trying to design a circuit using TI's CC1110. I am going to follow the TI's reference design for the balun.
The output impedance of the CC1110 at 915 mHZ is a differential complex impedance 86.5+j43. I have to then convert it into an unbalanced 50ohm port with a series of low pass filter and notch filter. The 50ohm output is headed to a SMA connector.
I have network analyzer and spectrum analyzer in my school laboratory. Can anyone suggest a practical method to verify the followings after the fibrication of PCB?
1. The network is matching properly.
2. The harmonics is supressed into an acceptance level
For the requirement 1 above, the difficulty is that I don't know how to use VNA to verify a differential output. Do I need a 4 port or 3 port VNA to do the job? Or do I need some kind of differential probe (if it exists)? Also the RF port of the CC1110 is just 2 pin of a QFN package. How can I probe it with a network analyzer?
For the requirement 2 above, can I just connect the SMA connector of my PCB to a spectrum analyzer to do the checking?
Do I need any other equipment to do the job?
Thanks for giving me directions!
Thank you and regards,
Tony