Test & Measurement

Combination enables on wafer DUT solution

26th July 2022
Mick Elliott

Rohde & Schwarz says it can offer a test solution for full RF performance characterisation of the DUT on-wafer.

It combines the R&S ZNA vector network analyser from Rohde & Schwarz with engineering probe systems from FormFactor.

As a result, semiconductor manufacturers can perform reliable and repeatable on-wafer device characterisation in the development phase, during product qualification and in production.

5G RF front-end designers aim to ensure proper RF capabilities for frequency coverage and output power while optimizing energy efficiency.

An important phase in this process is investigating the RF design, to get feedback on the design as early as possible and assess the performance and capabilities already on the wafer level.

Characterising a DUT in an on-wafer environment requires a measurement system which includes a vector network analyser (VNA), a probe station, RF probes, cables or adapters, a dedicated calibration method as well as calibration substrates for the particular DUT or application.

The R&S ZNA characterises all RF qualification parameters at coaxial and waveguide levels, as well as frequency extenders for application ranges above 67 GHz.

FormFactor addresses the wafer contact with manual, semi-automated and fully automated probe systems including thermal control, high-frequency probes, probe positioners, and calibration tools.

The calibration of the complete test system, including the R&S ZNA, is supported in the FormFactor WinCal XE calibration software.

In the test setup, the user has access to all test capabilities of the R&S ZNA thanks to the fully calibrated setup.

Generic S-parameter tests allow characterisation for filters and active devices, but distortion, gain and intermodulation tests can also be performed to qualify power amplifiers.

Frequency translating measurements for mixers with phase characterisation across the bandwidth of the device are another example of the supported measurement applications of the joint solution.

The fully calibrated setups also allow all results to be directly taken from the VNA without post­-processing as the calibration data are applied directly to the VNA.

Frequency extenders from Rohde & Schwarz open up sub-THz frequencies such as D-band, currently in the focus of 6G research.

The extenders will be integrated to the probe station to ensure shortest cabling and enable optimal dynamic range while avoiding losses due to cabling to the probe tip.

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