Epson Launches VCXOs for Mobile Base Stations and Optical Communications Equipment

  Epson Launches VCXOs for Mobile Base Stations and Optical Communications

                 A product from the new VG-4513CB VCXO series

Business Wire

SAN JOSE, Calif. -- March 10, 2013

Epson Electronics America, Inc. (EEA) today announced that is has begun
shipping samples of the VG-4513CB series of voltage controlled crystal
oscillators (VCXO). Designed for optical networking and LTE (long-term
evolution) base stations applications, the VG-4513CB uses a high-frequency
fundamental^(*1) crystal to achieve output frequencies up to 500 MHz with no
spurs and very low phase noise and low jitter^(*2). The VG-4513CB is packaged
in a very small package, 87% smaller than existing VCXOs, and has excellent
vibration sensitivity.

Epson’s VG-4513CB is the industry’s first VCXO to deliver output frequencies
up to 500 MHz without using a PLL^(*3) or frequency multiplier^(*4). By using
a high-frequency fundamental-mode AT-cut crystal, Epson achieves better
reliability, lower power, and lower phase noise than existing 500 MHz VCXO
products. Using a fundamental-mode crystal, Epson’s VG-4513CB achieves very
low jitter, 50 fs rms at 491.52 MHz. 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^(*5) 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% 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 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
solutions - and the peace of mind that goes with them."

Main characteristics of VG-4513CB VCXO series

1. Wide frequency range and low jitter

  *Fundamental frequency oscillation

100 MHz – 500 MHz

  *Low jitter (12 kHz - 20 MHz)

122.88 MHz: 210 fs

245.76 MHz: 70 fs

491.52 MHz: 50 fs

Figure 1 shows measured phase noise for VG-4513CB at three common base station
frequencies: 122.88, 245.76, and 491.52 MHz.

Figure 2 shows a spectrum analyzer measurement of VG-4513CB operating at
491.52 MHz. Because VG-4513CB uses fundamental-mode oscillation, it does not
generate spurs.

By comparison, VCXOs using frequency multipliers generate sub-harmonic spurs,
as shown in Figure 3.

2. Low G (vibration) sensitivity

G sensitivity: 0.6 ppb/g at  245.76 MHz

3. Compact Package

Package size: 5.0mm x 3.2mm x 1.3mm Typ.

4. Pull Range

Epson's VG-4513CB is available in three pull ranges: ±30×10^-6、±50×10^-6, and

More information about Epson’s quartz devices:


*1: Fundamental frequency

The lowest (1st-order) frequency at which a quartz crystal resonator

*2: Jitter

Fluctuation among clock cycles, which can cause bit errors during data

*3: PLL (Phase Locked Loop)

An electronic circuit that locks an oscillator to the frequency of an input
signal. PLLs can be used to multiply an input to a higher frequency, but they
add jitter and spurs.

*4: Frequency multiplying

Multiplying the input frequency. Doubling the frequency is expressed as a 2x
frequency multiplier, and tripling it as a 3x frequency multiplier, etc.
Frequency multipliers can be used to generate high frequencies but they
increase jitter and generate sub-harmonic spurs.


QMEMS is a combination of “Quartz,” a crystalline material that has excellent
stability and precision, and “MEMS,” micro electro-mechanical systems
engineered using micro-fabrication technology. QMEMS devices, produced via a
micro-fabrication process on a crystalline material, combine the advantages of
MEMS technology with the fundamental superiority of Quartz. * QMEMS is a
registered trademark of Seiko Epson Corporation.

About Epson

Epson is a global imaging and innovation leader whose product lineup ranges
from inkjet printers and 3LCD projectors to sensors and other microdevices.
Dedicated to exceeding the vision of its customers worldwide, Epson delivers
customer value based on compact, energy-saving, and high-precision
technologies in markets spanning enterprise and the home to commerce and

Led by the Japan-based Seiko Epson Corporation, the Epson Group comprises more
than 81,000 employees in 97 companies around the world, and is proud of its
ongoing contributions to the global environment and the communities in which
it operates.

About Epson Electronics America, Inc.

Epson Electronics America, Inc. (EEA), is a subsidiary of Japan-based Seiko
Epson Corporation (SEC) and is responsible for sales, marketing and
engineering of the product lines of SEC's MicroelectronicsDevice Division in
the America's. EEA provides a wide array of timing and frequency control
products, integrated circuits, sensing device and system solutions for
customer products and applications that require high levels of accuracy,
reliability, stability, energy efficiency and compact design. Based in San
Jose, California, the EEA Group hasthree regional offices, more than 40 sales
offices in the U.S., and a growing network of exclusive distributors.

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Epson Electronics America, Inc.
Jan Souza, 310-955-5317
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