“傳統(tǒng)上，性能接近24小時保持的時鐘體積龐大、耗電量大且價格昂貴。誤差交換OCXO石英晶體振蕩器是一種出色的解決方案，可實現(xiàn)更小、更低功耗的參考時鐘，從而實現(xiàn)經(jīng)濟高效的系統(tǒng)級同步。我們的新解決方案對于尋求全包式、高性價比和小型化解決方案的O-RAN設(shè)備供應(yīng)商尤其有價值。”

誤差交換同步是一種技術(shù)，旨在通過使用網(wǎng)絡(luò)處理器和同步PLL顯著增強OCXO保持能力（性能提升高達(dá)兩倍），通常在IEEE 1588實施中提供。

PLL和處理器計算OCXO頻率和1 PPS信號之間的誤差，然后將其反饋給OCXO進行老化補償。OCXO將溫度變化引起的頻率殘余誤差和老化補償誤差結(jié)合起來，并將其反饋到處理器中進行系統(tǒng)頻率校正。E2OCXO概念使Rakon OCXOs能夠在7x5mm石英晶振的緊湊封裝中在真實環(huán)境下實現(xiàn)8小時的保持。

Mercury E2OCXO正處于原型制作階段，將提供14x9、9x7和7x5毫米三種封裝。14x9封裝的樣品將于2024年年中上市。

Rakon展示了經(jīng)過O-RAN優(yōu)化的微型OCXO

Rakon demonstration of groundbreaking O-RAN optimised miniature OCXO with extended holdover at MWC Barcelona 2024

Rakon is demonstrating its industry-first long holdover solution for advanced radio networks and telecom data centres at MWC Barcelona 2024.

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 14x9, a 9x7 and a 7x5mm package. Samples of the 14x9 package will be available mid 2024.

我們的小尺寸OCXO有源晶振基于領(lǐng)先的專有Mercury和Mercury+技術(shù)。它們在整個溫度范圍內(nèi)具有出色的頻率穩(wěn)定性。MercuryX是Rakon首款采用其專有Mercury ASIC和XMEMS諧振器技術(shù)的OCXO，增強了穩(wěn)定性和保持性能。例如，ROM1490X在-40°C至+95°C溫度范圍內(nèi)的頻率穩(wěn)定性為1.5ppb，保持時間為8小時，頻率老化為0.2 ppb/天。

這種高度集成的基于ASIC的OCXO設(shè)計具有最少的互連數(shù)量，從而顯著提高了可靠性，并因此降低了設(shè)備的總擁有成本（TCO）。
應(yīng)用程序：Data中心同步基站和小型蜂窩、高級5G、6G無線接入網(wǎng)絡(luò)（RAN）、網(wǎng)絡(luò)定時、3E同步（IEEE1588，SyncE）、5G RRHs、光網(wǎng)絡(luò)和微波傳輸系統(tǒng)。

Product Name	Package Size (LxWxH)	Nominal Frequency (Fn)	Frequency Stability (FvT)	Temperature Range (°C)
ROM1490X	14.2 x 9.2 x 6.5 mm	10 to 50 MHz	±1.5 ppb	-40 to 95 °C
ROM1490E	14.2 x 9.2 x 6.5 mm	10 to 50 MHz	≤±5 ppb	-40 to 85 °C
ROM1490EA	14.3 x 9.1 x 5.9 mm	10 to 50 MHz	≤±10 ppb	-40 to 95 °C
ROM9070EA	9.7 x 7.5 x 3.9 mm	10 to 50 MHz	≤±10 to 20 ppb	-40 to 95 °C
ROM1490PS	14.2 x 9.2 x 6.5 mm	10 to 50 MHz	≤±10 ppb	-40 to 85 °C
ROM1490PA	14.3 x 9.1 x 5.9 mm	10 to 50 MHz	≤±10 ppb	-40 to 95 °C
ROM9070PA	9.7 x 7.5 x 3.9 mm	10 to 50 MHz	≤±10 to 20 ppb	-40 to 95 °C
ROM7050PA	7.5 x 5.5 x 3.3 mm	10 to 50 MHz	≤±20 ppb	-40 to 105 °C
RFPO55	14.6 x 9.7 x 6.2 mm	10 to 26 MHz	≤±10 ppb	-40 to 85 °C
RFPO50	14.6 x 9.7 x 6.2 mm	10 to 40 MHz	≤±20 ppb	-40 to 85 °C
RFPO45	9.7 x 7.5 x 4.3 mm	10 to 26 MHz	≤±10 ppb	-20 to 70 °C -40 to 85 °C
RFPO40	9.7 x 7.5 x 4.3 mm	10 to 40 MHz	≤±20 to 50 ppb	-40 to 85 °C