Agilent/Keysight U9391F

The Keysight U9391F is a comb generator that generates frequency harmonics from an RF input signal for precision phase calibration in nonlinear measurements. Built on InP MMIC technology, it delivers excellent amplitude and phase flatness across a wide output frequency span, making it the calibration standard for the Keysight PNA-X nonlinear vector network analyzer (NVNA). The unit accepts input signals from 10 MHz to 6 GHz and produces harmonics spanning 10 MHz to 50 GHz.

Its user-selectable divide ratio (1, 2, 4, 8, or 16) and USB-controlled frequency divider enable flexible tone spacing down to 10 MHz minimum, critical for characterizing nonlinear devices. Calibration data is NIST-traceable and retrieved rapidly via plug-and-play USB integration with the PNA-X platform.

Technical Specifications

• Output Frequency Range: 10 MHz to 50 GHz


• Input Frequency Range: 10 MHz to 6 GHz


• Input Power Range: −15 dBm to +15 dBm


• Minimum Output Power per Picket: −80 dBm at 10 MHz input PRF


• Typical Output Power: −95 dBm


• Divide Ratio: 1, 2, 4, 8, or 16


• Minimum Tone Spacing: 10 MHz


• Power Supply: +15 VDC ±10%


• Current Consumption: 300 mA (nominal)


• Operating Temperature: 0 °C to 40 °C


• Storage Temperature: −40 °C to 70 °C


• Weight: 0.370 kg

Key Features

• InP MMIC technology for superior phase stability


• USB control interface with PNA-X NVNA integration


• Selectable divide ratios for wide input signal frequency accommodation


• Bulk-head connectors (1.85 mm, 2.4 mm, 3.5 mm); 2.4 mm output


• ESD immunity: 8 kV direct discharge, 15 kV air discharge per IEC 61000-4-2


• Operating altitude rating: <4,572 meters

Typical Applications

• Nonlinear device characterization and S-parameter measurement


• Phase calibration in vector network analysis


• Multi-tone stimulus generation for intermodulation testing

Compatibility & Integration Designed for seamless integration with Keysight PNA-X NVNA systems via USB plug-and-play connectivity. Windows 10 64-bit (Version 1809+) or Windows 11 64-bit required; Intel Core i5 processor, 8 GB RAM, and 1920×1080 display recommended.