Pulse modulation and noise figure measurements to 60 GHz

September 15, 2015 // By Graham Prophet
By combining the ZVA high-end vector network analyser (VNA) with the ZVAX-TRM extension unit, users of Rohde & Schwarz instruments can extend measurement sets when characterising active components.

The combination of the ZVA and ZVAX-TRM can measure the noise figures of amplifiers, converters and transmit/receive (T/R) modules for radar and satellite applications. ZVAXxxB31 and ZVAXxxB32 options for the ZVAX-TRM make it possible to carry out this measurement on amplifiers with low gain of only 10 dB and low noise figures down to the 1 dB range. Rohde & Schwarz has also expanded the test setup's pulsed signal measurement capabilities to the 60 GHz range by adding the ZVAX67B712 and ZVAX67B73 pulse modulator options.

The ZVAX-TRM extension unit can be combined with any network analyser from the ZVA family, from 24 GHz to 67 GHz. It complements the functionality of the ZVA family and supports, for example, measurements with high power levels up to +43 dBm, with two tone signals or pulsed signals, as well as noise figure measurements, and group delay measurements on embedded LO converters. The stimulus and measured signals from the VNA are fed to the ZVAX-TRM, where they are conditioned. The signals are then either output via the ZVAX-TRM ports or fed back to the VNA and output via the VNA test ports. The ZVAX-TRM makes it possible to decouple signal conditioning from the network analyser, which offers a major benefit: The high-end VNA is protected from overvoltage and overpower damage during high power measurements. When the ZVA is used to perform standard network analyser tasks, i.e. without the ZVAX-TRM, the user can access the full RF performance of the high-end network analyser in terms of output power level, dynamic range and long-term stability. The frequency range for the ZVAX67B712 and ZVAX67B73 pulse modulator options has been expanded to 67 GHz.

Rohde & Schwarz; www.rohde-schwarz.com