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E8257D-UNR Enhanced Phase Noise Performance

Product Status: Discontinued | Currently Supported
This product is no longer available

A replacement for this product is available:


Improve Close-In Phase Noise Performance of the PSG

Option UNR sets a new industry standard for microwave signal generator phase noise performance. Option UNR replaces the PSG standard internal frequency reference with a high performance internal frequency reference that improves the close-in phase stability to provide superior phase noise performance at offsets less than 10 kHz from carrier.

Typical Applications

Option UNR is recommended for signal generation applications that require spectrally pure signals and/or outstanding modulation accuracy. Typical applications include LO substitution, low-jitter clock stimulus, blocking/interference signals, stimulus/response measurements close to carrier, and high-order digital-modulation-format (e.g. 128 QAM, OFDM) signal generation.

This option cannot be added as a product upgrade – only available at time of purchase.



  • Industry leading phase noise performance - The improved frequency reference minimizes residual FM resulting in superior phase noise performance at offsets < 10 kHz from carrier. At 10 GHz carrier frequency and 1 kHz offset, Option UNR achieves over 25 dB improvement compared to standard phase noise performance.
  • Unrivaled technology leadership - Attain leading-edge frequency reference technology in a standard off-the-shelf microwave signal.