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HFF crystal oscillators come in compact sizes

Posted: 28 Apr 2008 ?? ?Print Version ?Bookmark and Share

Keywords:crystal oscillator? compact size? WiMAX?

Epson Toyocom Corp. has announced the commercial development of two new models of highly accurate, miniature, high-frequency fundamental mode (HFF) crystal oscillators for high-frequency applications in optical transmission devices, cellular base stations, WiMAX base stations and other core network equipment.

The new HFF crystal oscillators, the VG-4511CA and the SG-771PCD series, are entering volume production this month.

Communications network equipment providers require increasingly demanding performance from frequency-stable, high-frequency crystal oscillators in order to assure communications reliability and to support higher bandwidths and transmission speeds, even as the need for smaller, space-saving devices accelerates.

Epson Toyocom has been using QMEMS fabrication technology to provide HFF crystal oscillators having a crystal unit with a proprietary inverted-mesa structure. This structure, wherein only a portion of the resonator near an excitation electrode is thinned, enables higher stability and higher frequency. In addition to offering enhanced performance, the new HFF crystal oscillators were made a compact 7mm x 5mm x 1.6mm by adopting a single-sealed structure instead of the conventional double-sealed structure. Meanwhile, ageing characteristics were improved by using wire bonding to bond the crystal chip and package.

To meet market needs for a wider selection of devices for a wider range of transmission equipment and base station specifications, Epson Toyocom is beefing up its lineup with the SG-771PCD crystal oscillators and the VG-4511CA series of frequency-adjustable VCXOs.





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