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Epson's VCXO tweaked for LTE base stations, optical comms

Posted: 12 Mar 2013 ?? ?Print Version ?Bookmark and Share

Keywords:Epson? VCXO? LTE? base stations? optical communications?

Epson Electronics America has recently begun shipping samples of its VG-4513CB series of voltage controlled crystal oscillators (VCXO). The company's latest offering is designed for optical networking and long-term evolution (LTE) base station applications and will achieve output frequencies up to 500MHz with no spurs and very low phase noise and low jitter. The VG-4513CB is packaged in a very small package, 87 per cent smaller than existing VCXOs, and has excellent vibration sensitivity.

Epson has touted its VG-4513CB as the industry's first VCXO to deliver output frequencies up to 500MHz without using a PLL or frequency multiplier. By using a high-frequency fundamental-mode AT-cut crystal, Epson achieves better reliability, lower power, and lower phase noise than existing 500MHz VCXO products. Using a fundamental-mode crystal, Epson's VG-4513CB achieves very low jitter, 50 fs rms at 491.52MHz. Unlike PLLs and frequency multipliers, Epson's fundamental technology does not generate spurs.

The high-frequency fundamental-mode crystal is fabricated using Epson's QMEMS technology. QMEMS combines the superior material characteristics of Quartz with MEMS (Micro-Electrical Mechanical System) fabrication techniques. In addition to allowing reliable fundamental-mode oscillation, QMEMS enables size reduction of the VCXO and improves vibration sensitivity.

Epson's VG-4513CB is delivered in a very small 5.0 mm x 3.2 mm x 1.3 mm package. Its footprint is 87 per cent smaller than 14 mm x 9 mm VCXO products. This dramatic size reduction enables very dense designs such as multi-channel optical networking equipment and multi-channel MIMO (multiple input multiple output) LTE base stations.

Epson's QMEMS technology enables Epson to improve vibration resistance three-fold over previous products. At a mere 0.6 ppb/g, Epson's VG-4513CB provides a stable frequency reference for base stations which must be installed in challenging environments, such as near railroad (railway?) tracks.

"With their compact design, high precision, and high stability, Epson's new products will contribute to the success of LTE," said Masayuki Morozumi, Executive Vice President and Chief Operating Officer of Epson's Microdevices Operations Division. "Epson will continue to leverage its QMEMS and semiconductor technologies to provide customers with powerful, easy-to-use solutionsand the peace of mind that goes with them."

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