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KYOCERA KINSEKI Develops World’s Smallest TCXO with ±100ppb Overall Frequency Stability

Quartz crystal oscillator for micro base stations supports high packet volume, high-speed wireless communications of smartphones

September 13, 2011

Kyocera Corporation (President: Tetsuo Kuba; herein “Kyocera”) and its wholly-owned subsidiary in charge of quartz device development and manufacturing, Kyocera Kinseki Corporation (President: Takeshi Sakai; herein “Kyocera Kinseki”), announced the development of the KT5032F — a Temperature Compensated Crystal Oscillator (TCXO) for micro base stations such as femtocells which supports high-capacity, high-speed wireless communications. The KT5032F is the world’s smallest TCXO* (5.0×3.2×1.7(max) mm), featuring an overall frequency stability of ±100ppb (±100×10-9).

The new product was developed by utilizing the unique miniaturization technology of Kyocera Kinseki, which commands the No. 1 global market share for mobile phone TCXOs. Kyocera Kinseki will continue to contribute to the stabilization of the wireless broadband communication environment which is ever expanding due to increased use of smartphones.

This product will be on display at CEATEC JAPAN 2011, to be held at the Makuhari Messe in Chiba, between October 4 (Tue.) and October 8 (Sat.).


Photo: KT5032F Temperature Compensated Crystal Oscillator
KT5032F Temperature Compensated Crystal Oscillator
(0.5mm increments shown)


Product name

Temperature Compensated Crystal Oscillator KT5032F

Nominal frequency

10-32MHz

Overall frequency stability (temperature characteristics, power supply voltage characteristics, includes 24H aging)

±100 × 10 -9 (=±0.1ppm)

Power consumption (current consumption)

0.03W@5v, CMOS output (6mA max.)

Output Waveform

Clipped sine / CMOS output

Long-term frequency stability

±3 × 10-6/10 years max

Dimensions

5.0 × 3.2 × 1.7(max) mm

Mass production schedule

From March 2012 (samples available from September 2011)



Development Background

At present, high frequency bandwidths such as the 2GHz bandwidth are used for high-speed wireless communication of high volume packet data. Due to the straightness of the radio waves — a transmission characteristic of this frequency bandwidth — and the large number of physical obstacles, it can be difficult for radio waves to reach indoor areas. Therefore, in order to secure a stable communication environment even indoors, there has been an increasing need for micro femtocell base stations that have high-precision and can be placed almost anywhere.

In these circumstances, higher precision and more compact quartz crystal oscillators used in micro base stations have been sought after. Furthermore, even higher precision is being demanded of TCXOs that are more compact, consume less power, and generate less heat compared to Oven Controlled Crystal Oscillators (OCXO) currently used for communications base stations.

Main Features

In order to stabilize the communication environment using TCXOs, the KT5032F has achieved a high ±100ppb (±100×10-9) overall frequency stability with optimum specifications for three characteristics: power supply voltage characteristics, 24H aging, and temperature characteristics. Furthermore, by fully utilizing Kyocera Kinseki’s miniature element design technology, the company has been able to realize the world’s smallest TCXO. When compared to conventional Kyocera Kinseki TCXOs, it has a 54% smaller footprint and greatly contributes to reducing size and power consumption.

1. World’s smallest size
In addition to the combination of miniature element design technology, miniature quartz processing technology and high-precision assembly technology — accumulated through the company’s experience in developing mobile phone components, GPS equipment and car navigation systems — Kyocera Kinseki has succeeded in miniaturizing the quartz crystal oscillator with its high quality synthetic quartz growth technology.

Compared to the conventional KT7050 (7.0×5.0×1.7mm), the KT5032F has realized a 54% smaller footprint, thereby reducing size and power consumption. The KT5032F is expected to contribute to the miniaturization of femtocell base stations, which are increasing in use.

2. High-precision, highly reliable overall frequency stability of 100ppb (±100×10-9)
In order to facilitate the TCXO’s usage in micro base stations, high-precision overall frequency stability was realized through not only temperature characteristics, but by also adding power supply voltage characteristics and 24H aging.

For the purpose of adding these two new characteristics, aging characteristics, hysteresis against temperature and microdips have been improved through the company’s unique advanced quartz processing and assembly technologies; and such improvements enabled Kyocera Kinseki to improve the temperature characteristics of quartz. The high-precision characteristics realized of an overall frequency stability of (±100ppb (±100×10-9)) has resulted in the outstanding product quality with a frequency stability with long-term reliability, contributing to an increase in femtocell base station accuracy.

3. Low power consumption, low heat generation and outstanding startup characteristics Through
performing temperature compensation that utilizes the company’s unique simulation technology to match the temperature characteristics of the quartz crystal oscillator, the KT5032F has achieved low power consumption, low heat generation and fast startup without the use of a thermostatic oven. By taking advantage of the miniature, high-stability, high-precision, low power consumption and low heat generation characteristics of the KT5032F to reduce the load on the environment in the future, Kyocera Kinseki will offer and accommodate network equipment compatible with the high-precision Stratum 3 transmission network standards as well as measurement equipment and medical testing equipment, where high accuracy is required.

* As of September 6, 2011. Based on research by Kyocera Kinseki.