1. Subproject 1
NTHU
Advisor: Professor Ta-Shun Chu
1

2. Things to Do
• 1. Make the 35GHz Standing-Wave Oscillator
Array as a single Cell.
• 2. Adjust some circuits(?)
– CML → TSPC : To lower the power(?)
• 3. Adjust reference frequency(?)
– 2G, 4G (needed?)

3. Things to Do
• 4. Co-design the buffer and mixer.
• 5. Redesign 35GHz phase-rotating PLL
– Figure out the reasons for failure.

4. Subproject 2
NCTU
Advisor: Professor Yu-Jiu Wang
4

5. 目前現有問題
• System方面
1. 散熱要改善
2. Array Pattern 畫不正確 (反射?)
• 單一Channel方面
1. Channel Gain 比預期低
2. Settling Time (散熱? DCOC?)
3. 功耗要下降

6. 相位補償
•
•
•
•
A ∙ cos
A ∙ cos
A ∙ cos
A ∙ cos
𝜔 𝐵𝐵 ∙
𝜔 𝐵𝐵 ∙
𝜔 𝐵𝐵 ∙
𝜔 𝐵𝐵 ∙
𝑡
𝑡 −𝜋 ∙ 𝑠𝑖𝑛𝜑 𝑖 +∆𝜃2
𝑡 −2𝜋 ∙ 𝑠𝑖𝑛𝜑 𝑖 +∆𝜃3
𝑡 −3𝜋 ∙ 𝑠𝑖𝑛𝜑 𝑖 +∆𝜃4

7. 相位補償 - 當反射波存在時
入射角θir
•
•
•
•
A ∙ cos
A ∙ cos
A ∙ cos
A ∙ cos
𝜔 𝐵𝐵 ∙
𝜔 𝐵𝐵 ∙
𝜔 𝐵𝐵 ∙
𝜔 𝐵𝐵 ∙
𝑡
𝑡
𝑡
𝑡
+ B ∙ cos
+ B ∙ cos
+ B ∙ cos
+ 𝐵 ∙ cos
𝜔 𝐵𝐵 ∙
𝜔 𝐵𝐵 ∙
𝜔 𝐵𝐵 ∙
𝜔 𝐵𝐵 ∙
𝑡
𝑡+𝜋(𝑠𝑖𝑛𝜑 𝑖 −𝑠𝑖𝑛𝜑 𝑖𝑟 )
𝑡+2𝜋(𝑠𝑖𝑛𝜑 𝑖 −𝑠𝑖𝑛𝜑 𝑖𝑟 )
𝑡+3𝜋(𝑠𝑖𝑛𝜑 𝑖 −𝑠𝑖𝑛𝜑 𝑖𝑟 )

8. Future Work
• We will like to figure out what’s causing the array pattern problems.
• It can be multipath due to reflections on our PCB? On the chamber? Etc.
•
• Is there a way, (after we do multiple incident angle, multiple phase-shift, )
that we try to figure out what goes wrong with our basic assumption?
• That is the phase difference between adjacent element are:
• L*Sin(theta)/(Lambda) <- something is wrong for this assumption.
•
• It will be good if we can figure out what goes wrong?
• At the same time to figure out, 1.) how to reduce it in PCB assembly level,
2.) DSP level.
• Yu-Jiu

9. Subproject 3
NTU
Advisor: Professor Borching Su
9

10. Reference Antenna
?
=
𝑑1
𝜃1
Case 1: Set antenna 1 as reference
𝑑2
𝜃2
Case 2: Set center as reference

11. Incident Angle of Transmitter
𝜃2
?
=
𝑑1
𝜃1
Case 1: Change the place of Tx
𝑑2
𝜃2
Case 2: Rotate the Tx

12. Calibration with Different Incident Angle
𝑑1
𝜃1 =
0°
Case 1: Incident angle = 0°
Acos(wt)+Bsin(wt)
𝑑2
𝜃2
Case 2: Incident angle = 𝜃2
Acos(wt+ 𝜽 𝟐 )+Bsin(wt+ 𝜽 𝟐 )

13. Beamforming Pattern Before Calibration
• Choose the beamforming codes without the
signal amplitude sorting and the 600 points
selection.
• Choose the beamforming codes with the
signal amplitude sorting but without the 600
points selection(verify the performance of
additivity).

14. Counter Control
• Modified verilog codes for using a FPGA
button to control the counter of PGA control
codes.
• If any error happens, we don’t have to restart
the counter and measure all data again.

15. To-do List
• Measure and plot the beamforming pattern
before calibration.
• Do the receiver calibration when the incident
angle of the transmitter is not zero degree.
• Find a appropriate method for the calibration
of the transmitter.