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Cascade Probe Systems

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We offer a complete line of premium performance analytical probe stations for on-wafer probing and board test that help increase process performance while reducing cost of ownership. Our probe systems are available with a complete set of accessories such as microscopes, thermal control systems, software and industry-leading probes.

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        FRT - a FormFactor company - manufactures powerful surface metrology tools for various sectors such as development production and quality control. Due to the design and construction of these multi-sensor devices, FRT tools can be used for multiple applications.

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                Asset 4
                  Company Blog September 20, 2018

                  Blog

                  EPS150MMW

                  In the University Lab: Exploring the Outer Limits of High-Frequency CMOS Circuitry

                  September 20, 2018

                  Numerous technologies require the generation of signals that range into the millimeter-wave (mmW) region and beyond into the terahertz range, so researchers are actively developing radio frequency (RF) circuitry implemented at the chip level, where substantial size and cost benefits can be realized.

                  Numerous technologies, such as radar, imaging and spectroscopy, require the generation of signals that range into the millimeter-wave (mmW) region and beyond into the terahertz range. In response, researchers are actively developing radio frequency (RF) circuitry implemented at the chip level, where substantial size and cost benefits can be realized.

                  Dr. Omeed MomeniOne such group includes Dr. Omeed Momeni and his colleagues at the University of California Davis. Their long-term goal is to push CMOS-based circuitry to its theoretical limits in the 700 GHz range. In pursuit of this vision, they focused on the design of a voltage-controlled oscillator (VCO) targeted at a 130 nm BiCMOS process. In a paper delivered at the 2016 International Solid State Circuits Conference, Dr. Momeni and his colleague Rouzbeh Kananizadeh reported successful operation of this on-chip VCO at frequencies up to 190 GHz with a tuning range of 20.7% and a maximum power output of -2.1 dBm.

                  To verify this circuit, they assembled a test and measurement system that included our 150 mm probe station to contact the on-chip output pads connected to the VCO circuitry. The EPS150RF probe station’s compact architecture occupied a minimum of valuable lab space, and we minimized the team’s startup time by completing the initial system assembly.

                  The fabricated VCO circuit was delivered to the lab in the form of individual die each containing a single copy of the circuit. Consequently, Dr. Momeni’s team configured the EPS150RF for probing by mounting each die on its own board, which was then vacuum-sealed onto the probe station’s chuck for probing operations. Each board included wire bonding to deliver various DC voltages and ground connections to the chip, which also contained two additional pads that were probed to capture the VCO’s output.

                  The RF output frequencies of the VCO required exceptional probe performance to deliver accurate, repeatable results, and we met this challenge with our Infinity Probe, which delivers dependable results into the 500 GHz range and beyond. It minimizes probe loss while substantially reducing unwanted coupling and transmission modes.

                  In this particular application, the Infinity Probe’s waveguide was coupled with a harmonic mixer to complete the signal path to a spectrum analyzer, which conducted the frequency measurements. It verified a tuning range of 20.7% at a center frequency of 190.5 GHz.

                  The power output of the VCO was verified with a similar probe setup, which created a signal path from the chip’s output pads to a power meter. In this case, a waveguide attachment with a 90-degree E-bend helped position the Infinity Probe in acceptable physical proximity to the power meter. It verified a maximum output power of -2.1 dBm. In all cases, the EPS150RF and its Infinity Probe provided the low, stable contact resistance required for consistent, accurate measurements at the RF frequencies produced by the VCO.

                  For Dr. Momeni and his colleague, the successful fabrication and operation of this BiCMOS circuit represents a significant performance milestone in progress toward the integration of RF circuitry onto relatively low-cost semiconductors. We are proud to have played a part in their research.

                  Click here to see the 150 mm product line brochures and other documentation to discover how you can optimize your research lab for discovery.

                  Share





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