Browse Prior Art Database

Gigahertz Probe Assembly

IP.com Disclosure Number: IPCOM000077691D
Original Publication Date: 1972-Sep-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Beers, HR: AUTHOR

Abstract

The disclosed probe assembly is useable in the 10 gigahertz region for the testing or evaluation of an unmounted integrated circuit device, eg., the measurement of cutoff frequency or other parameters. The probe is conveniently fabricated from a standard coax cable and jack connector, in an arrangement permitting the tuning of the transition from the coaxial cable to the connector to present a low reflection, 50 ohm transmission line from the chip pads to the signal cable.

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Gigahertz Probe Assembly

The disclosed probe assembly is useable in the 10 gigahertz region for the testing or evaluation of an unmounted integrated circuit device, eg., the measurement of cutoff frequency or other parameters. The probe is conveniently fabricated from a standard coax cable and jack connector, in an arrangement permitting the tuning of the transition from the coaxial cable to the connector to present a low reflection, 50 ohm transmission line from the chip pads to the signal cable.

Jack connector body 1, dielectric support 2 and center contact 3 are commercially available items, to which are added center conductor extension 4 which is supported by dielectric 5. Stepped outer conductor 6 is adapted to receive subminiature coaxial cable 7, the outer conductor of which is soldered to the conductor 6 at surface 8. The inner conductor of coaxial cable 7 is soldered to the center conductor extension 4 at surface 9. Tuning adjustment is permitted by positioning the stepped outer conductor 6 for lowest voltage standing-wave ratio before soldering to connector body 1 along surface 10. For probing purposes, the center conductor of rigid coaxial line 7 should be replaced with a beryllium wire having a preformed tip. A diameter of 4.5 mils yields a characteristic impedance of about 51 + 1 ohm in the case of a 0.021 diameter coaxial cable 7 and a 7 millimeter connector 1.

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