yenJ
Newbie level 1
Hi,
I am trying to design the RF part of an 802.15.4 board with ATmega128RFA1. This is my first RF design and I need help from someone more experienced.
First, I want to know the dimensions of the 100ohm differential trace to the balun. I use Sonnet simulator but I am not sure if i use it the right way. I will describe what I do step-by-step. Please let me know if I miss something.
1. I have chosen the dielectric layers: 1000mils of air above the board and FR4 (30 mils of board). Below the trace is the ground plane.
2 .I moved the sides of the box away from the traces.
3. I have drawn the footprints of the IC and a balun, and added two 100Ohm ports: 1,-1 and 2,-2
4. Next, I have drawn the differential line. I left the 10 mils gap (the same as the IC pin spacing), while the width is parametrized.
5. Finally, I set up the the parameter sweep analysis ( 10 to 50 mils, 5mils step @2.45GHz). I get the following results
According to that I will choose 30 mils width for my board.
Before I proceed to the next step (balun to antenna), I want to know if my procedure described above is OK.
Then I'll have some more questions
I am trying to design the RF part of an 802.15.4 board with ATmega128RFA1. This is my first RF design and I need help from someone more experienced.
First, I want to know the dimensions of the 100ohm differential trace to the balun. I use Sonnet simulator but I am not sure if i use it the right way. I will describe what I do step-by-step. Please let me know if I miss something.
1. I have chosen the dielectric layers: 1000mils of air above the board and FR4 (30 mils of board). Below the trace is the ground plane.
2 .I moved the sides of the box away from the traces.
3. I have drawn the footprints of the IC and a balun, and added two 100Ohm ports: 1,-1 and 2,-2
4. Next, I have drawn the differential line. I left the 10 mils gap (the same as the IC pin spacing), while the width is parametrized.
5. Finally, I set up the the parameter sweep analysis ( 10 to 50 mils, 5mils step @2.45GHz). I get the following results
According to that I will choose 30 mils width for my board.
Before I proceed to the next step (balun to antenna), I want to know if my procedure described above is OK.
Then I'll have some more questions