The Error Exchange OCXO (MercuryX E2) is a variant of Rakon’s newly released MercuryX small form factor IC-OCXO. It enhances the existing synchronisation capabilities on a network synchroniser evaluation board by adding frequency error exchange processing and ageing compensation to the system – doubling the holdover performance.

Rakon Head of Product Management, Reza Sedehi, says the Error Exchange OCXO is Rakon’s latest groundbreaking innovation and the first synchronisation solution of its kind.

“Phase synchronisation holdover is essential in 5G DUs, RAN, radios and telecom data centres as it reduces the overall operational cost for mobile carriers,” says Sedehi.

“Traditionally, clocks performing close to 24-hour holdover are bulky, power-hungry and expensive. The Error Exchange OCXO is an elegant solution that will result in smaller, low-power reference clocks for cost-effective system-level synchronisation. Our new solution will be particularly of value for O-RAN equipment vendors who look for turnkey, cost-effective and miniaturised solutions.”

Error Exchange Synchronisation is a technique designed to significantly enhance the capability of OCXO holdover (up to twice the performance) by using a network processor and a synchronisation PLL, typically available in IEEE 1588 implementations.

The PLL and the processor calculate the error between the OCXO frequency and the 1 PPS signal, then feed it back to the OCXO for ageing compensation. The OCXO combines the frequency residual error due to temperature variations and ageing compensated error and feeds it back into the processor for system frequency correction. The E2OCXO concept enables Rakon OCXOs to achieve 8 hours of holdover under real world conditions in a compact 7 x 5 mm package.

The Mercury E2OCXO is in prototyping stage and will be available in a 14 x 9, a 9 x 7 and a 7 x 5 mm package. Samples of the 14 x 9 package will be available mid 2024.

Product Name	Package Size (LxWxH)	Nominal Frequency (Fn)	Frequency Stability (FvT)	Temperature Range (°C)
LNO320B1	95 x 76 x 23 mm	320 MHz	≤±1 ppm	0 to 50 °C
LNO320D1	70 x 70 x 35 mm	320 MHz	≤±2 ppm	-40 to 80 °C
LNO480D1	70 x 70 x 35 mm	480 MHz	≤±2 ppm	-35 to 71 °C
LNO480B2	47.5 x 59.5 x 12.7 mm	480 MHz	≤±2 ppm	0 to 50 °C
LNO500B2	47.5 x 59.5 x 12.7 mm	500 MHz	≤±2 ppm	0 to 50 °C
LNO500D1	70 x 70 x 35 mm	500 MHz	≤±1 ppm	-40 to 70 °C
LNO640B1	95 x 76 x 23 mm	640 MHz	≤±2 ppm	0 to 50 °C
LNO640D1	70 x 70 x 35 mm	640 MHz	≤±2 ppm	-40 to 70 °C
LNO800E1	25.4 x 22 x 12.7 mm	800 MHz	≤±3 ppm	0 to 50 °C
LNO960B2	47.5 x 59.5 x 12.7 mm	960 MHz	≤±2 ppm	0 to 50 °C
LNO1000D1	70 x 70 x 35 mm	1 GHz	≤±2 ppm	-40 to 70 °C
LNO1000E1	25.4 x 22 x 12.7 mm	1 GHz	≤±2 ppm	0 to 50 °C
LNO1000B2	47.5 x 59.5 x 12.7 mm	1 GHz	≤±2 ppm	0 to 50 °C
LNO1200B2	47.5 x 59.5 x 12.7 mm	1.2 GHz	≤±2 ppm	0 to 50 °C
LNO1200E1	25.4 x 22 x 12.7 mm	1.2 GHz	≤±2 ppm	0 to 50 °C
LNO1280B1	95 x 76 x 23 mm	1.2 GHz	≤±2 ppm	0 to 50 °C
LNO2000B1	95 x 76 x 23 mm	2 GHz	≤±2 ppm	0 to 50 °C
LNO3200B3	120 x 76 x 23 mm	3200 MHz	≤±2 ppm	0 to 50 °C
LNO4800B3	120 x 76 x 23 mm	4.8 GHz	≤±2 ppm	0 to 50 °C
LNO5000B3	120 x 76 x 23 mm	5000 MHz	≤±2 ppm	0 to 50 °C
LNO10000B3	120 x 76 x 23 mm	10 GHz	≤±2 ppm	-40 to 70 °C

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