The reference clock you need !
All electronic systems require oscillators to operate, with more or less frequency stability depending on the application (consumer electronics, automotive, computing, telecom, medical, defense, others).
A minor part of industrial applications, often with high value-added, need to use high-precision oscillator inside their embedded electronics. Syrlinks provides a variety of Oven Controlled Crystal Oscillators with different performances (AT or SC cut quartz) and metal housing options (DIL14 or Europack).
Time Server (NTP/PTP) for Telecom network synchronization
PTP/NTP time servers are widely used as synchronization equipment for telecom infrastructures (4G, 5G).
PTP/NTP Server & Gateway Manufacturers implement different type of local oscillators inside their products, depending on the market needed and hold-over performances to be achieved. Syrlinks GNSS Timing Modules SGTM™ can provide a typical hold-over (also named phase error) of ±1.5 µs over 8h and ±2.5 µs over 24h.
Focus on PTP Network Case
For critical applications that require to synchronize systems within a network, IEEE has defined a 1588 standard protocol called “Precision Time Protocol” (PTP). Released as a standard in 2002, IEEE 1588 was designed to provide fault tolerant synchronization among heterogeneous networked clocks.
The PTP protocol provides a method of synchronizing all clocks of the network to use the highest quality clock within that network. By running a distributed algorithm, each clock in the network identifies the highest quality clock; and all the elements can use the best source of clock. The “highest ranking” clock synchronizes all other ‘slave’ clocks.
However, many factors affect the accuracy of the synchronization levels achievable using IEEE 1588. Progressively, individual clocks in a system will drift apart from others due to frequency changes in their local timing source. This drift can be reduced by using higher stability timing sources. In increasing order of stability, oven-controlled crystal oscillators EWOS10HP and Timing Modules SGTM10HP provide higher stability than alternative TCXO or OCXO of the market given a power budget between 100mW to 500 mW.
In addition, Low Power Oven Controlled Crystal Oscillators EWOS10HP or SGTM10HP Timing Modules used as local oscillators in a PTP Gateway are dissipating much less power than conventional Oven Controlled Crystal Oscillators. The system can operate fanless, simplifying the design and increasing the resulting reliability in time (MTBF).
Indoor Location using tags and UWB location beacon
Tracking tag, how it works ? The tag emits a signal to the installed beacons within the defined indoor parameters of the building.
Location beacon (UWB or Bluetooth low energy)
The beacons communicate with each other through radio signals allowing the system to locate objects. These beacons are compact, and battery powered to ease the deployment of the solution. The radio technology used accurately locates tagged objects. To optimize the accuracy of the positioning and save battery, a low power, high precision clock is required for this type of beacon.
For such application OCXO EWOS10 is the best option. EWOS10 shows a Thermal Drift limited to 0,1 ppm, and consumes only 75mW @ 25°C. SGTM10-CT, thanks to Thermal Compensation feature, improves this performance by a factor of 50:
Thermal Drift of SGTM10-CT is only ± 2 ppb (0,002 ppm) for a power consumption of 100 mW (@ 25°C).
Metrological instruments & Oven controlled crystal oscillators
Radars, portable Metrological equipment devices are requiring high spectral purity.
Location beacon (UWB or Bluetooth low energy)
Spectral Purity, in Oven Controlled Crystal Oscillator is measured by phase noise and is a critical parameter. Phase noise is defined as noise power in a 1Hz bandwidth, at a specific frequency close to the carrier, and the phase noise of the crystal oscillator can impact the performance of the complete system.
In Radars or Metrological equipment (such as Network Analyzer), phase noise of the local oscillator can cause the signal spectrum to leak into adjacent channels, causing noise and interference.
For equipment which require such high level of spectral purity and very low power, such as portable measurement device, selecting the appropriate low phase noise OCXO is vital to ensuring overall system performances and reliability in a limited size and weight. For those, EWOS10HP and SGTM10HP have demonstrated good in phase noise with values such as -125dBc/Hz at 10Hz for EWOS10HP and for a power budget limited to 400 mW @ 25°C.
Indeed, Low Power clocks EWOS10HP and SGTM10HP have been designed to be integrated in demanding applications requiring high level of spectral purity and low power consumption, such as battery-powered network analyzer or portable mine detectors. Optimizing power consumption enables to reduce the battery size, meaning it smaller, lighter, and easier to handle.