Stanford CG792 Multichannel Clock Synthesiser

The CG792 extends precision clock synthesis capabilities with up to four independent ultra-low jitter outputs from 1 mHz to 2.2 GHz. Reliable, low-jitter clocks help maintain signal integrity in systems using high-speed ADCs and DACs and other applications, minimising artifacts caused by jitter and modulation.

Features:

• Clocks from 1 mHz to 2.2 GHz
• Up to four synchronisable channels
• Random jitter less than 1 ps rms
• 11 digits of frequency resolution
• 100 ps rise and fall times
• Frequency and phase modulation
• OCXO and rubidium timebase (opt.)
• USB, Ethernet, and RS-232 interfaces

In communications systems and networks, jitter, wander, or frequency offsets can lead to high bit error rates or total loss of synchronisation. The CG792 provides exceptionally clean, stable clocks required for the most critical applications while setting new standards for frequency accuracy, phase noise performance, and operational flexibility.

The CG792 extends precision clock synthesis capabilities with up to four independent ultra-low jitter channels from 1 mHz to 2.2 GHz. Reliable, low-jitter clocks help maintain signal integrity in systems using high-speed ADCs and DACs and other applications, minimising artifacts caused by jitter and modulation.

Advanced New Architecture

At the heart of the CG792 lies a sophisticated dual analog PLL architecture utiliing state-of-the-art reference synthesiser phase locked loops. This design employs intelligent spur avoidance algorithms that automatically select optimal reference frequencies to eliminate integer boundary spurs. The system automatically chooses between several precision reference frequencies to maximize phase detector frequency while minimising spurious content, maintaining decimal frequency resolution with seamless frequency transitions.

Precision Timebase Options

The CG792 accommodates diverse timing requirements with multiple timebase configurations. The standard crystal timebase provides excellent stability, while optional OCXO or rubidium frequency standards offer higher precision for demanding measurements. An external 10 MHz reference input with automatic detection ensures compatibility with existing laboratory standards.

Versatile Outputs

Each channel provides three synchronized outputs optimized for different applications. High-speed differential outputs provide square waves with programmable offset and amplitude and sub-100-picosecond transition times. The CMOS output delivers fixed 3.3 V logic levels optimized for high-impedance loads.

Low Phase Noise and Jitter

With exceptionally low phase noise and high frequency resolution, the CG792 can replace RF signal generators in many applications. Front-panel outputs provide square waves up to +7 dBm — ideal for driving RF mixers.

Advanced Phase Control and Synchronisation

The CG792's built-in phase measurement system enables automatic channel synchronisation. Hardware-based channel coupling establishes deterministic phase relationships, while fast phase slew enables rapid timing adjustments.