Key Features & Specifications
- Up to 12 dB improvement compared to Option UNX phase noise performance
- Low close-to-carrier and pedestal phase noise
- Switchable integrated dividers provide a 15 dB phase noise improvement for carrier frequencies below 250 MHz
Improve PSG phase noise performance
The PSG equipped with Option UNY sets the industry standard for microwave signal generator phase noise performance. Option UNY provides an advanced phase lock loop circuit along with a high-performance internal frequency reference that improves both the close-in and pedestal phase stability to provide superior phase noise performance at all offsets less than 250 kHz from carrier. With the integrated frequency dividers enabled (included with Option UNY), the E8257D uses a dividing technique to output carrier frequencies below 250 MHz. This results in improved phase noise at all offsets for these frequencies. The dividers can be disabled, returning the PSG to a standard mode of creating low frequencies with a heterodyning technique. This mode provides wider deviation bandwidth for frequency and phase-modulated signals.
Option UNY is recommended for signal generation applications that require the utmost in 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 as a reference source for phase noise test systems.
This option may be available as a product upgrade, depending on the serial number of your instrument. For more information, see E8257D Signal Generator Upgrades.