Agilent / Keysight 83491A Electrical clock recovery module

The Agilent/Keysight 83491A is an electrical clock recovery module that extracts clock signals from NRZ data streams for high-speed digital communication system analysis. When a direct clock signal is unavailable, this module enables reliable parametric testing and signal characterization across the 86100-series and 83480A Digital Communications Analyzers.

Technical Specifications

• Selectable rates: 155, 622, 1063, 1250, 2125, 2488, and 2500 Mb/s


• Data triggering range: 50 Mb/s to 2500 Mb/s for non-standard rates


• Clock recovery tolerance: ±0.1% Signal Performance


• Input power level: −10 dBm to +3 dBm


• Output jitter: 0.0125 UI across all rates


• Through path insertion loss: 7 dB (DC to 2500 MHz), 10 dB (4500 MHz)


• Electrical return loss: 20 dB (DC to 1250 MHz), 15 dB (1250–2500 MHz) Clock Recovery & Triggering


• Phase-locked loop bandwidth: 50–70 kHz (internal path triggering), 4–5 MHz (external output)


• Three trigger sources: narrow bandwidth recovered clock, wide bandwidth recovered clock, and data trigger


• Built-in 50/50 internal splitter reduces external hardware requirements

Key Features

• Electrical outputs for both recovered clock and regenerated data


• 50 Ohm electrical input connector with 3.5 mm (m) output connectors


• Exceptional jitter performance ensures accurate jitter display on incoming data


• Approximately 5 lbs weight

Typical Applications Clock extraction from NRZ data streams in high-speed digital signal analysis, parametric testing without dedicated clock signals, and reliable signal characterization across multiple data rates.

Compatibility & Integration Operates within 86100A/B, 86100C, and 86100D Infiniium DCA mainframes. Compatible with Agilent passive and active probes. User's guide and datasheet available.