Findings on MDI Return Loss Measurement GITESH BHAGWAT SANTA BARBARA DESIGN CENTER

Size: px

Start display at page:

Download "Findings on MDI Return Loss Measurement GITESH BHAGWAT SANTA BARBARA DESIGN CENTER"

Eustacia Newton
5 years ago
Views:

1 Findings on MDI Return Loss Measurement GITESH BHAGWAT SANTA BARBARA DESIGN CENTER 1

2 Supporters Eric DiBiaso (TE Connectivity) Bin Lin (TE Connectivity) Kurt Smith (Coilcraft) 2

3 Presentation Outline MDI Return Loss Mask Power Coupling Inductors Modified Test Fixtures Inductance versus Current for same Core Test Fixtures with Inductors and MDI Connectors Backup Slides Additional Measured Data 3

4 MDI Return Loss Mask Previously Suggested Mask versus Adopted Link Return Loss Mask (N=) Reference: Return Loss (Sdd22) Proposed_MDI_RL_Mask Adopted_Link_RL_Mask_N= -5 5Mhz 3.5Ghz E+6 1.E+7 1.E+8 1.E+9 1.E+1 Frequency (1kHz to 1GHz) 4

5 MDI Return Loss Mask New Possible Mask to Accommodate Higher Baud Rate of 5.625GHz Possible_MDI_Return_Loss_Mask Return Loss (db) Adopted_Link_RL_Mask_N= Return Loss LLLLLL 1111 ( 1111 ) for 55 ff 1111 ff 2222 for 1111 ff LLLLLL 1111 ( ff ) for 55 ff LLLLLL 1111 ( ff ) for 33 ff where ff is frequency in MHz Mhz Ghz 5.5Ghz 3 1.E+6 1.E+7 1.E+8 1.E+9 1.E+1 Frequency (Hz)- 1GHz to 1GHz 5

6 Test Fixtures Copper clad boards, Copper tape to tie GND planes Notice the close proximity of the termination resistors, Coupling Inductors and SMA Connector Schematic Termination Resistors 125POC PFL3215 PFL mm mm mm 3 Old vs New 6 Test Fixture

7 Return Loss (Sdd22) - Baselines SMA_Terms Adopted_Link_RL_Mask_N_ Return Loss - Sdd22 Baseline_HF_Res Baseline_Generic_Res E+9 1E+1 Frequency (Hz) 7

8 Power Coupling Inductors Optimum Inductance Part Number Inductance (uh) Tolerance (%) Dimensions (mm) Core Volume (mm 3 ) Max. Ambient Temp (2 rise) PFL /- 2% 3.2 X 2.3 X mA Current Rating ( 2 rise) 125POC /- 2% * 3.2 X 1.4 X mA * PFL /- 2% 4.9 X 3.4 X ma * Estimated Value for preliminary samples 8

9 Return Loss (Sdd22) Power Coupling Inductors Return Loss - Sdd22 PFL_3215_682_Generic POC125_682_Generic PFL_4514_682_Generic 4.9uH_2%Tol_1%Drop_6.8uH_OCL' E+9 1E+1 Frequency (Hz)

10 Power Coupling Inductors Inductance versus Current Part Number Inductance (uh) Tolerance (%) Dimensions (mm) Core Volume (mm 3 ) Max. Ambient Temp (2 rise) PFL /- 2% 3.2 X 2.3 X mA Current Rating ( 2 rise) PFL /- 2% 3.2 X 2.3 X ma PFL /- 2% 3.2 X 2.3 X mA PFL /- 2% 4.9 X 3.4 X mA PFL /- 2% 4.9 X 3.4 X mA PFL /- 2% 4.9 X 3.4 X ma 125POC3 1 +/- 2% * 3.2 X 1.4 X mA- 2% Drop 125POC /- 2% * 3.2 X 1.4 X mA * For Same Core Volume and Material, Higher Inductance comes at the cost of Lower Current * Estimated Value for preliminary samples 1

11 Return Loss (Sdd22) Higher Inductances -4 PFL_3215_153_Generic Return Loss - Sdd22 PFL_4514_153_Generic 1_8uH_2%Tol_1%Drop_15uH_OCL -4 PFL_3215_13_Generic Return Loss - Sdd22 PFL_4514_13_Generic POC_125_13_AE_Generic 7_2uH_2%Tol_1%Drop_1uH_OCL E+9 1E+1 Frequency (Hz) E+9 1E+1 Frequency (Hz) Current Capacity sacrificed for Low Frequency Return Loss 11

Test Fixtures with Inductors and Prototype MDI

Baseline 2: Thru with NGAUTO Connector and Cable

12 Test Fixtures with Inductors and Prototype MDI Connectors Thru Configuration Port 1 Port 2 Calibration- E-Cal Port 1 Port 2 Port 1 Port 2 Baseline 1: SMA Thru Connection- SMA_Thru_SMA Baseline 2: Thru with NGAUTO Connector and Cable boards- SMA_NGAUTO_SMA_Thru 12 * 3 meter STP Cable between Connectors

13 Baseline Measurement 13 Return_Loss(dB) SMA_NGAUTO_SMA_Thru_Port1Side SMA_NGAUTO_SMA_Thru_Port2Side SMA_Thru_SMA_Port1Side SMA_Thru_SMA_Port2Side E+6 1.E+7 1.E+8 1.E+9 1.E+1 Frequency (Hz) 1MHz to 1GHz Baseline insufficient 3mt long STP cable- Not strictly MDI only Return_Loss(dB) SMA_NGAUTO_SMA_Thru_Port1Side SMA_NGAUTO_SMA_Thru_Port2Side E+9 1.5E+9 2.E+9 Frequency (Hz) 1GHz to 2GHz

14 Test Fixtures with Inductors and Prototype MDI Connectors Thru Configuration Inductors Populated on Port 2 side 14 * 3 meter STP Cable between Connectors

15 Return Loss Measurement with Coupling Inductors POC125_682_On_Board_Port1Side Return_Loss(dB) -7 1.E+6 1.E+7 1.E+8 1.E+9 1.E+1 Frequency (Hz) 1MHz to 1GHz SMA_NGAUTO_SMA_Thru_Port1Side POC125_13_On_Board_Port1Side About 1dB to 2.5dB worsening of Return Loss due to Inductors from 1GHz to 2GHz Cable Insertion Loss comes into picture for Port1 Side measurements Return_Loss(dB) SMA_NGAUTO_SMA_Thru_Port1Side POC125_682_On_Board_Port1Side POC125_13_On_Board_Port1Side PFL3215_682_On_Board_Port1Side 1.E+9 1.5E+9 2.E+9 Frequency (Hz) 1GHz to 2GHz

16 Test Fixtures with Inductors and Prototype MDI Connectors Reflected Configuration Port 1 Port 2 Baseline: 5 ohm SMA terminations on NGAUTO Boards SMA_NGAUTO_SMA_Term for reflected only measurements 16 * 3 meter STP Cable between Connectors

17 Baseline Measurement 17 Return_Loss(dB) SMA_TermsOnBoard_Port1Side_Baseline E+6 1.E+7 1.E+8 1.E+9 1.E+1 Frequency (Hz) 1MHz to 1GHz Baseline insufficient 3mt long STP cable- Not strictly MDI only Return_Loss(dB) SMA_TermsOnBoard_Port1Side_Baseline E+9 1.5E+9 2.E+9 Frequency 1GHz to 2GHz

18 Test Fixtures with Inductors and Prototype MDI Connectors Reflected Configuration Port 1 Port 2 Inductors Populated on Port 2 side 18 * 3 meter STP Cable between Connectors

19 Return Loss Measurement with Coupling Inductors Return_Loss(dB) SMA_TermsOnBoard_Port1Side_Baseline POC125_13_On_Board_SMA_Terms -12 Return_Loss(dB) SMA_TermsOnBoard_Port1Side_Baseline POC125_13_On_Board_SMA_Terms E+6 1.E+7 1.E+8 1.E+9 1.E+1 Frequency (Hz) 1MHz to 1GHz E+9 1.5E+9 2.E+9 Frequency 1GHz to 2GHz About.5 to 1dB worsening of Return Loss due to Inductors from 1GHz to 2GHz 19

20 Conclusion Suggested MDI Return Loss Mask may be technically feasible Need to measure a closer approximation of MDI Only configuration- Improved Baselines Improvements such as Shorter STP Cable in the test fixtures 2

21 Thank You! QUESTIONS? FEEDBACK? 21

22 Backup Slides 22

23 MDI versus Link Return Loss: 1BASE-T1 and 1BASE-T1 Reference: 82.3bw with PoDL Return Loss Return Loss Mask Limited at Max. Baud Rate of 66MHz (PAM3) -5 1BASE-T1_Link and MDI Masks 1BASE_T1_Link_RL 1BASE_T1_MDI_RL 66Mhz Reference: 82.3bp Return Loss Return Loss Mask Limited at 6MHz under Max. Baud Rate of 75MHz (PAM3) -5 1BASE-T1_Link and MDI Masks 1BASE_T1_Link_RL 1BASE_T1_MDI_RL 75Mhz E+5 1.E+6 1.E+7 1.E+8 1.E+9 Frequency (1kHz to 1GHz) 1.E+5 1.E+6 1.E+7 1.E+8 1.E+9 Frequency (1kHz to 1GHz) 23

24 Test Fixtures with Inductors on Copper Clad Boards and Prototype MDI Connectors Reflected Configuration Port 1 Port 2 24 Baseline: 5 ohm terminations on Copper boards SMA_NGAUTO_Rigid_Cu_Term

25 Baseline Measurement Return_Loss(dB) Return_Loss(dB) 25 Reflect_Only_with_ADI_Baseline Reflect_Only_with_ADI_Baseline E+6 1.E+7 1.E+8 1.E+9 1.E+1 1.E+9 1.2E+9 1.4E+9 1.6E+9 1.8E+9 2.E+ Frequency (Hz) 1MHz to 1GHz Frequency (Hz) 1GHz to 2GHz Baseline marginal 3mt long STP cable- Not strictly MDI only

26 Test Fixtures with Inductors on Copper Clad Boards and Prototype MDI Connectors Reflected Configuration Port 1 Port 2 Reflected Only configuration with Coupling Inductors and Terminations on Copper Boards 26

27 Return Loss Measurement with Coupling Inductors POC125_682_Reflected PFL4514_682_Reflected PFL4514_13_Reflected Return_Loss(dB) POC125_13_Reflected PFL3215_682_Reflected PFL_3215_13_Reflected Reflect_Only_with_ADI_Baseline E+9 1E+1 Frequency (Hz) 1MHz to 1GHz About.8dB worsening of Return Loss due to Inductors from 1GHz to 2GHz POC125_682_Reflected PFL4514_682_Reflected PFL4514_13_Reflected Return_Loss(dB) POC125_13_Reflected PFL3215_682_Reflected PFL_3215_13_Reflected Reflect_Only_with_ADI_Baseline 1E+9 1.5E+9 2E+9 2.5E+9 3E+9 Frequency (Hz) 1GHz to 3GHz 27

1 Port 2 28 Baseline: Thru with NGAUTO boards, SMA

28 Test Fixtures with Inductors on Copper Clad Boards and Prototype MDI Connectors Thru Configuration Port 1 Port 2 28 Baseline: Thru with NGAUTO boards, SMA rigid links and Copper boards SMA_NGAUTO_Rigid_Cu_SMA_Thru

29 Baseline Measurement Return_Loss(dB) SMA_NGAUTO_Rigid_Cu_SMA_Thru_Port1Side SMA_NGAUTO_Rigid_Cu_SMA_Thru_Port2Side Return_Loss(dB) SMA_NGAUTO_Rigid_Cu_SMA_Thru_Port1Side SMA_NGAUTO_Rigid_Cu_SMA_Thru_Port2Side E+8 1.3E+9 1.8E+9 2.3E+9 2.8E+9 1.E+6 1.E+7 1.E+8 1.E+9 1.E+1 Frequency (Hz) 8MHz to 3GHz Frequency (Hz) 1MHz to 1GHz Baseline marginal, 3mt long STP cable- Not strictly MDI only Poor Return Loss of Copper Clad Thru Board

2 Thru with NGAUTO boards, SMA rigid links and

30 Test Fixtures with Inductors on Copper Clad Boards and Prototype MDI Connectors Thru Configuration Port 1 Port 2 Thru with NGAUTO boards, SMA rigid links and Inductors mounted on Copper boards SMA_NGAUTO_Rigid_Cu_SMA_Thru 3

31 Return Loss Measurement with Coupling Inductors Return and Insertion Loss (db) PFL3215_682_SMA_NGAUTO_Rigid_Cu_SMA_Thru_Port1Side PFL3215_682_SMA_NGAUTO_Rigid_Cu_SMA_Thru_InsertionLoss Adopted_Link_RL_Mask_N_ Adopted_Link_RL_Mask_N_2 Return and Insertion Loss (db) PFL3215_682_SMA_NGAUTO_Rigid_Cu_SMA_Thru_Port1Side PFL3215_682_SMA_NGAUTO_Rigid_Cu_SMA_Thru_InsertionLoss PFL3215_682_SMA_NGAUTO_Rigid_Cu_SMA_Thru_Port2Side Adopted_Link_RL_Mask_N_ Adopted_Link_RL_Mask_N_ E+6 1.E+7 1.E+8 1.E+9 1.E+1 Frequency (Hz) 1MHz to 1GHz Baseline marginal, 3mt long STP cable- Not strictly MDI only Poor Return Loss of Copper Clad Board with Inductors mounted 8.E+8 1.8E+9 2.8E+9 Frequency (Hz) 8MHz to 3GHz

Agilent USB3, Slide - 1. Agilent. USB3 Test Fixture Characterization. 10 MHz to 20 GHz March 12,

Agilent USB3, Slide - 1. Agilent. USB3 Test Fixture Characterization. 10 MHz to 20 GHz March 12, Agilent USB, Slide 1 Agilent USB Test Fixture Characterization 10 MHz to 20 GHz March 12, 2009 Agilent USB, Slide 2 Measurement Summary A prototype Agilent USB test fixture was measured using a 4port PNA,