CALIBRATION SUBSTRATES

CALIBRATION SUBSTRATES

The GGB Industries, Inc., line of CALIBRATION SUBSTRATES allows the user to calibrate any GGB Industries, Inc., microwave Picoprobe® at the probe tip. The underlying principal of the calibration of a measurement system is to provide accurate known standards to which the measurement system can be connected. The GGB Industries, Inc., line of calibration substrates is such a standard. Each calibration substrate contains highly precise elements for calibrating out the unavoidable errors and losses in a microwave network analyzer, its associated cabling, and the microwave probe to ensure accurate on-wafer testing.

Supports Precise SOLT, LRL/TRL, and LRM/TRM calibrations Includes CalKit software for easy loading to Network Analyzer Wide pitch range from 30 to 2,540 microns Suitable for all Picoprobes® from DC to 220 GHz Available for GS, SG, GSG Footprints Convenient alignment structures Individually tested and trimmed to exacting standards   Note: The above specifications may vary.
FIGURE 1

Our accurate, easy to use calibration substrates, calibration coefficients, and detailed instructions allow you to correct the measurement system (network analyzer + cabling + probe) whenever it produces a reading different than the standard.

The typical elements for calibrating a microwave measurement system consists of opens, shorts, matched loads, and throughs. These four elements have electrical characteristics that are very different from one another so that each element contributes an important part to the overall calibration process. In principle any set of standards could be employed, however, the more identical the standards are, the less accurate the calibration process becomes, which in turn results in inaccurate the on-wafer testing. Our precision crafted calibration substrates, when properly used, assure you of accurate on-wafer test results.

How to select the correct calibration substrate for your probing application(s):

1) Identify your Picoprobe's footprint and pitch (tip spacing);
2) Determine which calibration type is appropriate for your application (SOLT, LRL/TRL, or LRM/TRM)*;
3) Using the Calibration Substrate Selection Guide, choose the calibration substrate which matches your Picoprobe's footprint, recommended pitch range, and your preferred calibration type.

Calibration Substrate Selection Guide
Calibration Substrate	Pad Size (microns)	Calibration Types Supported	Footprint	Pitch Range Recommended (microns)	Pitch Range Acceptable (microns)
CS-5	50 X 50	SOLT, LRL, LRM	GSG	75 - 250	75 -250
CS-9	100 X 100	SOLT, LRL, LRM	GSG	250 - 600	150 - 600
CS-10	150 X 150	SOLT, LRM	GSG	600 - 1250	225 - 1250
CS-18	300 X 300	SOLT, LRM	GSG	1250 - 2540	500 - 2540
FIGURE 2

CS-8	50 X 50 100 X 100 150 X 150	SOLT, LRM	GS, SG	50 - 200	50 -300
CS-14	100 X 100	SOLT, LRM	GS, SG	200 - 400	150 - 600
CS-11	150 X 150	SOLT, LRM	GS, SG	400 - 1250	175 - 1250
CS-17	300 X 300	SOLT, LRM	GS, SG	750 - 2540	450 - 2540
FIGURE 3

Special Calibration Substrate Designed For Use Above 110 GHz
Calibration Substrate	Pad Size (microns)	Calibration Types Supported	Footprint	Pitch Range Recommended (microns)	Pitch Range Acceptable (microns)
CS-15	25 X 25	SOLT, LRL, LRM	GSG	40 - 150 (SOLT) 30 - 150 (LRL)	40 - 150
FIGURE 4

* SOLT = Short-Open-Load-Through
LRL = Line-Reflect-Line (Which is equivalent to TRL = Through-Reflect-Line)
LRM = Line-Reflect-Match (Which is equivalent to TRM = Through-Reflect-Match)