Timing in digital systems is the key to carry and to faithfully convert digital audio content. Why so? Let’s imagine that a digital to analog converter chip is fed from a clock containing a high level of phase noise, otherwise known as jitter in the time domain. Instead of being evenly spaced in time, the digital audio information converted to the analog domain is spread randomly around the ideal time, introducing undesired artifacts. The better the clock source, the lesser the phase noise, the more precise the conversion.
An ultra-low phase noise, high accuracy 10MHz oven controlled oscillator (OCXO) forms the heart of the T1, CH Precision’s first clock generator.
• 10MHz nominal frequency
• Square wave: 500mV or 1V peak to peak, selectable for each output
• Sine wave: 500mV or 1V peak to peak, selectable for each output
• 6 outputs, 75Ω BNC coaxial
• Transformer-coupled outputs
• Independant control of wave form for each output
• GPS input to suit the CH Precision GPS option
• TTL input for external synchronization
• Ethernet for remote control (CH Control App)
• USB for firmware upgrade
• Dedicated ultra low noise, three-stages discrete regulated linear power supplies for each section
• Galvanically isolated power supplies for the OCXO, the OCXO buffer and the output buffers
• Magnetically and electrostatically shielded toroidal mains transformer
• OCXO fitted inside a heavy aluminum block for improved core temperature stability
• OCXO aluminum block mounted on soft silicon gel for maximum damping
• Power transformer mounted on silent blocks
To avoid the inexorable drift in time of oscillators, a GPS option is available. Locking on satellites’ ultra-stable caesium clocks, it ensures that the T1 will perform identically today and for many years to come.