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N1076B/7A/7B/8A DCA-M

Data Sheets

N1076B/7A/7B/8A DCA-M

Optical and Electric Clock Data Recovery Solutions


For optical and electrical waveform analysis, the N1076B electrical clock recovery up to 64 GBd, the N1077A optical/electrical clock recovery up to 32 GBd, the N1077B optical/electrical clock recovery up to 64 GBd, and the N1078A optical/electrical clock recovery up to 64 GBd provide clock recovery solutions.

The N107x-series user interface and operating system is identical to the modern FlexDCA interface of the N1000A and 86100D. A user-provided PC running N1010A FlexDCA software controls the N107X over a simple USB 2.0 or 3.0 connection.

Electrical and Optical Clock Recovery Solutions

Keysight clock recovery solutions offer a wide data rate range and are ideal for many transmitter and receiver test setups for computers, datacom, and communication standards. The Keysight Technologies, Inc. electrical clock recovery solutions provide clock recovery capabilities for electrical non-return-tozero (NRZ) and pulse amplitude modulation 4-level (PAM4) signals.

• Supports NRZ and PAM4 signals

• Integrated O/E and clock recovery design

• Optical splitter: Integrated or External - user supplied

• Ultra-low residual random jitter < 100 fs RM

• Jitter spectrum analysis (JSA) capability

• Golden phase-locked loop (PLL) for compliant operation

The Keysight Technologies, Inc. optical/electrical clock recovery integrates electrical clock recovery with an amplified optical-to-electrical (O/E) converter, enabling it to work for both electrical and optical applications. Optional integrated optical splitters are available, which simplifies setup and improves ease-of-use.

All models include adjustable loop bandwidth and selectable peaking, and provide high sensitivity and low intrinsic jitter performance that ensures optimal measurement accuracy. The optional jitter spectrum analysis (JSA) capability provides insight into the magnitude and distribution of low-frequency jitter, which is helpful in troubleshooting root cause for excessive jitter.

Recover clocks from closed eyes: The N1076B, N1077B, and N1078A electrical clock recovery includes integrated variable equalizers on both electrical inputs to enable opening closed eyes.

PLL and jitter spectrum analysis

Use the Keysight Technologies FlexPLL analysis software (N1010300A Signal Integrity Package) to make fast, accurate, and repeatable measurements of phase-locked loop (PLL) bandwidth/jitter transfer. The N107x can be configured as a jitter receiver, which can be combined with a precision jitter source, such as the Keysight Technologies M8000 Series of BER test solutions, to create a PLL stimulus-response test system. PCI Express®-approved PLL bandwidth compliance tests are preconfigured, with automatic report generation.

What Does Clock Recovery Do?

Clock recovery takes an incoming data (or clock) signal, locks onto it using a phase-locked loop (PLL) circuit, and outputs a recovered clock. The recovered clock can be used as a timing reference for oscilloscopes or BERTs.

Standards typically specify loop order, bandwidth, and peaking, all of which determines how much jitter on the incoming signal will appear on the recovered clock (also known as the jitter transfer function, or JTF). Users can configure the FlexDCA graphical user interface (GUI) to adjust these parameters and ensure standards-compliant clock recovery (often referred to as a “golden PLL”).

Why Use Clock Recovery?

Standards compliance

To comply with standards such as IEEE 802.3 Ethernet, Fibre Channel, or the Optical Interworking Forum – Common Electrical Interface (OIF-CEI), clock recovery must be used when performing measurements such as jitter, eye width, and/or eye height.

Clock-less devices

Another reason to use clock recovery is when a clock or trigger signal is not provided by the device under test (DUT), but a clock is required to trigger an oscilloscope, or the error detector in a BERT.

Electrical Clock Recovery

The N1076B provides instrument-grade clock recovery on electrical signals up to 64 GBd. Adjustable loop bandwidth and peaking ensures standards-compliant clock recovery capability. The N1076B is controlled via a USB connection to an N1000A or 86100D DCA-X mainframe or to a standalone PC running N1010A FlexDCA software.

Accurate clock recovery for high-speed applications:

• Recovers clock from data streams up to 64 GBd (N1076B Option 264)

• Supports both NRZ and PAM4 signal types

• Tolerates small input signals

• Provides an auxiliary clock output signal with intrinsic random jitter as low as 100 fs RMS for accurate measurements. Use to connect to N1000A DCA-X precision timebase (PTB) input

• Optional jitter spectrum analysis (Option JSA) feature provides additional insight into jitter and allows users to perform jitter measurements using an “ideal” clock recovery model

• Connects to an N1000A DCA-X or PC via a USB 2.0 interfaceLoop


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