US-Based Epson Toyocom Timing Products Division Brings World’s First High-Stability Saw Oscillator With Frequency/Temperature Coefficients That Challenge Crystal Counterparts
El Segundo, CA (Vocus) September 22, 2009
Epson Toyocom Corporation’s U.S.-based Timing Products Division today announced that it has achieved the world’s first SAW resonator with a frequency/temperature coefficient that is represented by a cubic curve (Figure 1). The EG-4101/4121CA from Epson, incorporates this completely new category of resonator; high-frequency, low jitter(*1) and low phase noise(*2) SAW oscillators that provide outstanding frequency stability over a wide temperature range. These new SAW oscillators employ a unique and patented quartz SAW cut, with unmatched frequency-temperature stability, best-in-class phase-noise performance, and absence of frequency jumping, providing clock solutions of unprecedented performance. Samples will be available in December 2009 with production units scheduled for the second quarter of 2010.
With each new market application, the amount of heat generated within electronic equipment has increased, not only because of the higher reference clock frequencies needed to support faster transmission speeds, but also because of the diminishing size of equipment enclosures, as epitomized by blade servers. Higher internal temperatures require a heightened need for electronic devices that operate over larger temperature ranges and at higher stability. Also in demand, are electronic devices that provide stable operation for extended periods in environments subject to hot and cold temperature extremes, such as outdoor wireless base stations. Anticipating these conditions, Epson leveraged its original SAW design approach to develop a SAW oscillator for LAN(*3) and SAN(*4) equipment with high-speed interfaces.
The EG-4101/4121CA also helps to further increase system reliability and quality in server/network devices and wireless communications applications requiring a highly stable, high-frequency clock with low jitter and low phase noise and requiring operation over a wider temperature range.
There are two ways to obtain a high-frequency reference clock signal. One way is to use a SAW oscillator at a high-frequency fundamental mode between 100 and 700 MHz to achieve outstanding jitter and phase noise characteristics. The other way is to multiply the signal of an AT oscillator with a circuit, resulting in exceptional temperature characteristics but increased jitter and phase noise.
Until now, SAW resonators having temperature characteristics that are represented by a quadratic curve have not had a frequency/temperature coefficient as good as that of AT crystal units having cubic curve coefficients. Epson Toyocom’s efforts have resulted in this new line of SAW oscillator with an improved frequency/temperature coefficient that boasts outstanding jitter and phase noise characteristics as well as a frequency/temperature coefficient that is equal to or better than that of an AT oscillator.
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