Features - GGB

1 Features Durable DC to 50 GHz Insertion loss less than db Return loss greater than 18 db Measurement repeatability -50 db Individually spring loaded contacts Any pitch from 25 to 1250 microns Variety of Footprints Patented coaxial designModel 50A probes mounted in three different adaptor stylesModel 50 AHigh PerformanceMicrowave Probesnon-planar structures. This reliable lowresistance contact is one of the keys toproviding highly repeatable Model 50 also provides direct viewingof the probe tips for accurate Model 50A can be mounted in variousadaptors for use with standard microwaveprobe stations. Custom mounts are GGB Industries Model 50A probesets new standards in microwave probingperformance. Using low loss coaxialtechniques, the Model 50A achieves aninsertion loss of less than db and areturn loss of greater than 18 db through50 its individually spring loaded, Be-ryllium-Copper tips, the Model 50A pro-vides reliable contacts, even when probingBYGGB INDUSTRIES INC.

2 Any pitch (tip spacing) from 50 to 1250microns may be specified. The probe canbe configured with Ground-Signal-Ground(G,S,G), Ground-Signal (G,S), or Signal-Ground (S,G) tip footprints. We recom-mend smaller pitches with a G,S,G foot-print for best to the Model 50A is through afemale mm connector and is also com-patible with the V Tips for Flexible ProbingEach Model 50A has patented, independently spring loaded tipswhich make contact to the probing surface. Because the tips areflexible they minimize circuit damage, increase probe life, andmost importantly, provide a reliable individually spring loadedcontact for each point. With a small amount of overdrive, the pointscrubs the surface to make a reliable contact free of dust, dirt, andoxide contamination.

3 The ability to view the exact contact areaeases probe positioning and allows for the precise positioningnecessary for good LRM calibrations. The flexible tips even allowprobing of non-planar surfaces such as ceramic substrates andlaser diode Transmission Improves PerformanceThe Model 50A uses a precision miniature 50 ohm coaxial cablefrom the probe tips to the connector interface. The coaxial designprovides lower loss and less radiation than coplanar designs. Theminiature coaxial cable is fabricated from flexible Beryllium-Copper which greatly improves the probe s CardsModel 40A probes can be mounted on standard inch probecards to provide a convenient method for testing wafers at highfrequencies using standard automatic or manual probe Cards combine our Model 40A probes for RF connec-tions with DC needles for power and low frequency of Microwave ProbesOther models of Microwave probes are available with standard tipspacings of up to 1250 microns.

4 Larger spacings are possible. Forspecial applications, the Model 50A can be mounted in customadaptors, the coaxial line can be bent to fit tight spaces, and the tipscan be configured to match extremely non-planar surfaces or non-symmetrically placed applications in the 75 to 120 GHz range the Model 120 Picoprobe with a W band wave guide connection is applications below 40 GHz, GGB Industries offers the Model40A Picoprobe which uses the K connector. The Model40A performs up to 40 GHz with less than db ( db typical)insertion loss and return loss of greater than 18 ExpertiseGGB Industries is the leading supplier of high impedance activeprobes offering models with input capacitances of as low as .02 pFand frequency responses of up to GHz.

5 With 22 years ofprobing experience, GGB Industries has broad capabilities incustom probe of Model 50A Tips with 150 Micron Pitch almosttouching a 50 calibration Probe Card with Model 40A ProbesExamples of the Multi-Contact Wedge which combinMultiple RF and DC contacts .neLOG FORWARD performance of two Model 50A-GSG-150-P Picoprobeswhile contacting a bare sapphire substrate with spacings of 100,200, and 400 uncalibrated performance of a Model 50A-GSG-150-PPicoprobe. The top trace is the round trip return loss into a shortwhich is twice the probe's insertion loss. The bottom trace is thereturn loss into a 50 ohm 50A Performance Data1G,S,G ConfigurationFrequency Range:DC to 50 GHzInsertion Loss:Less than db to 50 GHz(.85 db typical)Return Loss:Less than 30 db to 4 GHz(35 db typical)Less than 20 db to 26 GHz(23 db typical)Less than 18 db to 50 GHz(20 db typical)Crosstalk2:Less than 35 db to 50 GHz1 Specifications are for the P-style Model 50A Picoprobes with G,S,G configurationsand pitches of between 50 and 250 microns.

6 The C and T style Model 50 APicoprobes (see following page for mounting styles) have the same specificationsexcept for insertion loss, which is less than db ( db typical).2 Crosstalk is measured using two probes contacting a bare sapphire substrate 100microns : A linear-polar chart showing the calibrated response of aModel 50A-GSG-150-P while contacting a 10 pSec coplanar LOST method was used for 50A Performance Data3G,S and S,G ConfigurationFrequency Range:DC to 50 GHzInsertion Loss:Less than db to 40 GHz( db typical)Return Loss:Less than 30 db to 4 GHzLess than 15 db to 26 GHzLess than 12 db to 40 GHz3 Specifications are for the P-style Model 50A PicoprobesS12 REVERSE TRANSMISSIONLOG MAG. REF= 922 REV REFLREF= - GHz0180135-1354590-45-90 ORDERING INFORMATIONWhen ordering Model 50A probes, use the following part number-ing convention:Model 50A-configuration - pitch - mounting styleConfiguration: Specify GSG, GS or SG for tip placement whereS is the signal tip and G is a ground tip.

7 Use the following diagramto determine the appropriate ViewPitch: Specify ground (G) to signal (S) tip spacing in Microns from25 to 1250 microns. For standard GSG probes, the two spacings areequal. Contact the factory for spacings larger than 625 microns orunusual tip placement and Style: Specify T,C,P, or DP. Choose the appropriatemounting type for your application. The P and DP styles have theconnector pointing back at a 45 degree angle to give more workingarea above the probe. The DP style is used where extra clearancebeneath the probe is needed, however probe positioning is moredifficult. Due to the increased probing angle, the probe points slidefurther forward for a given change in the Z axis than our other styleprobes. Custom mounting styles are : A 50A-GSG-150-P is a Model 50A with Ground, Signal,Ground configuration with 150 microns between each contactmounted in a P style Styles and Dimensions3\93 GGB INDUSTRIES, INC.

8 BOX 10958 NAPLES, FL 34101 Telephone (239) 643-4400 Fax (239) 643-4403 E-mail: by US patent # 4,871,964