PCB Probing for Signal-Integrity Measurements
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1 TITLE PCB Probing for Signal-Integrity Measurements Richard Zai, PacketMicro Image
2 PCB Probing for Signal-Integrity Measurements Richard Zai, PacketMicro
3 Richard Zai, Ph.D. CTO, PacketMicro packetmicro.com.com SPEAKER Dr. Richard Zai is PacketMicro CTO and has more than 25 years of experience in architecting and delivering technology solutions in the areas of RF and signal integrity probing, wireless sensor networks, and radio frequency identification (RFID). In 1987, he joined IBM Watson Research Center as a research staff member and manager, where he pioneered in the development of RFID and high-speed robotic technologies. After leaving IBM in 1997, Richard co-founded start-up companies in Silicon Valley. Most recently, he has been leading the development of rugged 20-GHz test probes and patented probe stations that have been used by many Fortune 100 companies. Richard receives his Ph.D. degree from the University of Wisconsin- Madison and holds 15 US patents.
4 PCB PROBING FOR SIGNAL INTEGRITY MEASUREMENTS
5 CHALLENGES IN HIGH SPEED PCB DESIGN
6 CHALLENGES IN PCB PROBING Diverse Form Factors: PCBs, unlike silicon wafers, have many different sizes and shapes. Various Test Configurations: Single-sided, double-sided, daughter boards on motherboard, boards on a backplane, etc. Different Test Pad Orientations: Ground pads are sometimes not in the convenient locations. Robustness of Test Probes: Microprobes are good for probing wafers but too fragile for probing PCBs.
7 VARIOUS TEST CONFIGURATIONS Mother/Daughter Board Probing Large PCB Probing Vertical Probing
8 DIFFERENT TEST PAD ORIENTATIONS Differential signal pairs of DDR memory Not all the differential signal pads have adjacent GND pads
9 PROBING WITH GS & SG MICROPROBES Some differential signals cannot be probed.
10 PROBING WITH GSSG MICROPROBES GSSG microprobe is easier to use but still cannot probe 2 signal pairs.
11 DDR MEMORY BOARD LAYOUT Only 1 out of 5 differential pairs can be probed with GS & SG microprobes.
12 DIFFERENTIAL SIGNAL-SIGNAL PROBE Robust : Signal-Signal only D-Probe and de-embedding tool offer an easy, robust solution for PCB characterization. Accurate : 18-GHz D-Probe and 40-GHz differential GGB40A microprobe provide comparable measurement accuracy up to 18 GHz. Versatile: D-Probe with 2 signal-signal tips can probe differential pads without neighboring GND pads as required by microprobes with 4 GSSG tips.
13 DIFFERENTIAL TDR MEASUREMENT WITH D-PROBE 5 out of 5 differential pairs can be probed with signal-signal D-Probe.
14 0. 5 db/div 5 db/div D-PROBE SDD21 & SDD11 SDD21 SDD mm 0.8 mm 1.0 mm 0.5 mm 0.8 mm 1.0 mm 20 GHz 20 GHz D-Probe S4P extracted from probe-thru-probe by SFD de-embedding tool.
15 PROBE PLANARIZATION WITH MYLAR TAPE Quick and easy probe planarization procedure.
16 PCB CHARACTERIZATION 2X-Thru De-embedding Method: Accurate: comparable accuracy to traditional TRL technique Simple: only one 2x thru fixture is needed De-embedding Tools: EMStar Smart Fixture De-embedding (SFD) Tool AtaiTec In-Situ De-embedding (ISD) Tool Keysight Automatic Fixture Removal (AFR) Tool Left Fixture DUT + Fixture DUT + Fixture Left Fixture DUT Right Fixture Right Fixture 2x thru fixture 2x thru fixture
17 PCB PROBING WITH R&S ZNB20 VNA R&S ZNB20 VNA is ideal for S-parameter and TDR measurements.
18 TEST SETUP FOR D-PROBE VERIFICATION Probe launch allows D-Probes and microprobes to measure the same trace.
19 TEST BOARD STACKUP
20 SDD & TDD (6 STRIPLINE) D-Probe measurement of a 6 differential stripeline trace with a 40-mil stub
21 SDD & TDD (3 STRIPLINE) D-Probe measurement of a 3 differential stripeline trace with a 40-mil stub
22 TDR MEASUREMENT, D-PROBE vs. MICROPROBE TDD11 GGB D-Probe SMA 3 differential stripline trace with 40-mil via stub D-Probe and microprobe provide comparable TDR accuracy. * 40 GHz GGB dual microwave probe (Model 40 A) is used in the comparison.
23 SDD21, D-PROBE vs. MICROPROBE (6 TRACE) SDD21 SMA-ECal D-Probe-ECal GGB-Tip Cal (CS3) GGB ECal D-Probe shows low insertion loss with a simple ECal. * SMA with 16-mil via stub is used for the comparison.
24 SDD21: D-PROBE vs. MICROPROBE (3 TRACE) SDD21 SMA-ECal D-Probe-ECal GGB-Tip Cal (CS3) GGB ECal D-Probe shows low insertion loss with a simple ECal. * SMA with 16-mil via stub is used for the comparison.
25 Versatile: Multiport fixture de-embedding for singleended and differential devices with support of asymmetrical fixture configuration S-parameters and T-parameters conversion Mode transformation Powerful plotting tool Accurate: Comparable to Keysight ADS accuracy Easy-to-use: User-friendly interface Fast: Fast runtime with simple installation EMSTAR SFD TOOL
26 SDD21, D-PROBE vs. MICROPROBE (SFD) SDD21 (3 DUT) Microprobe ECal D-Probe-ECal SMA-ECal Probes and SMA have comparable de-embedded results D-Probe and GGB probes have similar accuracy up to 18 GHz
27 SMART FIXTURE DE-EMBEDDING (SFD) TOOL EMStar SFD and Keysight ADS have comparable accuracy. * Comparison was performed by Jthink Technology
28 Versatile: Multiport fixture de-embedding for single-ended and differential devices with support of asymmetrical fixture configuration S-parameters and T-parameters conversion Mode transformation Simple user interface: Data entry on one page ATAITEC ISD TOOL
29 SDD21, D-PROBE vs. MICROPROBE (ISD) SDD21 (3 DUT) D-Probe-ECal SMA-ECal Microprobe ECal Probes and SMA have comparable de-embedded results D-Probe and GGB probes have similar accuracy up to 18 GHz
30 RUGGED SINGLE-ENDED PROBE Robust : Strong Beryllium Copper (BeCu) probe tip allows direct probing on uneven surfaces, such as solder balls. Accurate : S-Probe and microprobe provide comparable measurement accuracy up to 20 GHz. Easy-to-use: Mylar tape approach makes probe planarization quick and easy. S-Probe TCS60 Cal Substrate
31 S-PROBE S21 & S11 S21 0 db S11 0 db -10 db -1 db -20 db -2 db -3 db -4 db 0.25 mm 0.5 mm 1.0 mm -30 db -40 db -50 db 0.25 mm 0.5 mm 1.0 mm -5 db GHz -60 db GHz Rugged probe with 20 GHz performance
32 PROBE-TIP CALIBRATION OF S-PROBE Two probe measurement of TCS60 thru. Leveling with Sharpie Calibrated at Tip Calibrated at SMA Direct Probing on Solder Bumps!
33 S-PROBE vs. MICROPROBE Transmission Line * 40 GHz Cascade ACP-40 GS/SG 550um microprobes were used for comparison Low-pass Filter * Comparison was performed by Jthink Technology S-Probe and microprobe have comparable accuracy up to 20 GHz.
34 SUMMARY PCB Probing for Signal Integrity Measurements Use 2x thru method: Simple: one 2x thru fixture Accurate: comparable to TRL accuracy Choose the right probes: Rugged probes 20 GHz Microprobes 20 GHz Select the good de-embedding tool Find the probe station meeting your current and future needs
35 MORE INFORMATION
36 Thank you! --- QUESTIONS?
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