IQD’s new IQCM-100 GPS advanced OCXO module for use in LTE and 4G base stations achieves a holdover specification of 1,5 microseconds over a period of 24 hours when locked to a 1 pps (pulse per second) input from an external GPS receiver, easily meeting industry standard holdover requirements.
The device incorporates an adaptive algorithm which has the ability to learn from a stable GPS signal over a period of 2 days, and can be adjusted to allow for errors. Frequency is accurate to within ±1E-12 when locked to a 1 pps GPS signal and can compete with the performance of many atomic clock references.
Housed in a 65 x 65mm hermetically sealed through-hole package, the IQCM-100 offers an HCMOS output, operating temperature range of -10°C to 60°C, 5 V supply voltage and a current input of 2 mA during warm up.
The module incorporates a low drop-out voltage regulator coupled to a highly stable internal OCXO which is conditioned by a digital-to-analog converter which in turn is fed from an ARM microcontroller. This controls an FPGA which provides the 1 pps output and is fed from the accurate GPS signal.
A feature of this product is the availability to the user of some 21 internal algorithm parameters. Using a serial data word output, the user can access information including current status (warm up, holdover or lock); time since attaining lock status; current phase shift between signal input and output; and average phase shift over the last hour.
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