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Frequency and timing reference module aimed at small cells

Posted: 10 Sep 2014 ?? ?Print Version ?Bookmark and Share

Keywords:Jackson Labs Technologies? small cell? LTE? SMT module? GPS receiver?

Jackson Labs Technologies Inc. has introduced the LTE-Lite frequency and timing SMT module that combines a GPS receiver, filtered power supplies and a software-disciplined crystal oscillator into a 0.7 x 1.18in footprint GPSDO SMT module. According to the company, the LTE-Lite uses true analogue crystal disciplining for superior phase noise and jitter performance.

The LTE-Lite time and frequency reference provides GNSS time and frequency synchronisation for cost-sensitive network equipment, in particular LTE 4G applications and small cell products from micro cells to femto cells. The LTE-Lite claims to provide better than one part per billion frequency accuracy and better than 10ns timing accuracy on average in a small SMT form factor that suits itself to high volume mass production products at cost points amendable to low-cost small-cell manufacturers.

LTE-Lite module

The LTE-Lite module includes a latest generation 60+ channels GPS receiver with auto survey position-and-hold mode, WAAS, EGNOS, MSAS and QZSS support that is used to discipline a highly stable and purpose-designed integrated VCTCXO or an optional external oscillator. The unit is available with standard telecom frequency choices such as 10MHz, 19.2MHz, 20MHz, 26MHz, 30.72MHz, 40MHz and others, and can auto-detect the frequency of the optional externally attached oscillator. The module also includes a synthesised frequency output that can generate one of seven TTL selectable frequencies that are phase-locked to the crystal oscillator and can range from 5-80MHz.

The LTE-Lite provides better than 1E-012 (one part per trillion) frequency accuracy averaged over 24 hours with GPS lock, and provides better than 25ppb typical frequency accuracy over 24 hours in holdover (flywheel) mode using the standard internal crystal oscillator, Toshiba stated. For extended holdover performance or increased phase noise performance the LTE-Lite module can gluelessly discipline an external oscillator, up to and including Cesium Vapor Cell (CSAC) atomic clocks.

The LTE-Lite module provides a number of standard GPS NMEA serial output sentences for easy software integration and access to the position, time and velocity (PVT) data as well as oscillator lock status information. The LTE-Lite module operates in either mobile GPS mode or in over-determined position-and-hold mode with auto-site-survey that allows operation with only one single satellite and improves the timing performance significantly in stationary applications. No software is required to integrate and operate the unit and all features and status information are available via TTL strap- and indicator-lines making integration into customer equipment as easy as providing 3.3V power and a GPS antenna feed to the module and monitoring the LOCK-OK TTL output and LED.

The LTE-Lite internal oscillator has a phase noise performance of -92dBc/Hz at 10Hz offset and a noise floor of less than -155dBc/Hz allowing the unit to directly control RF transceivers as well as baseband processors without any additional phase noise or spur filtering being required. An easy to use evaluation kit is available that operates from a USB port, includes a GPS antenna, and provides easy access to the modules' features using switches, buttons and MMCX coax connectors, Toshiba indicated.

LTE-Lite samples ship from stock.

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