Toshiba Adds New High-Gain, High-Linearity GaAs FETs For WiMAX Equipment

Jun 15, 2005

In an expansion of its terrestrial communication microwave device offering, Toshiba America Electronic Components, Inc. (TAEC) announced today at the IEEE MTT-S International Microwave Symposium that the company is now offering new high gain, high linearity internally matched gallium arsenide (GaAs) field effect transistors (FETs) targeted for use in amplifiers and microwave digital radios for 3.5GHz and 5GHz fixed wireless access (FWA) systems including Wireless Interoperability for Microwave Access (WiMAX) and the Unlicensed National Information Infrastructure (U-NII) compatible systems. Five new GaAs FETs, developed by Toshiba Corp. (Toshiba), provide a range of output power and gain to meet designers' requirements.

Microwave-based FWA systems provide point-to-point and point-to-multi-point signal transmission through the air over a terrestrial microwave platform, rather than through copper or fiber cables. As a result, FWA systems do not require satellite feeds or local phone service and can provide a wireless broadband alternative to cable modem or DSL connections.

To address the requirements of U-NII broadcast wireless systems, Toshiba has extended its Ultra-Linear (UL) GaAs FET product line with three devices in a new frequency range of 5.3GHz to 5.9GHz. Toshiba's UL process provides high gain, low intermodulation distortion and high efficiency. The three new UL devices are the TIM5359-4UL, which achieves high gain of 10.5 decibels (dB) with output power (typ.) of 36.5 dB relative to 1 milliwatt (dBm); the TIM5359-8UL with 10.0dB gain and output power (typ.) of 39.5dBm and the TIM5359-16UL with 10.0dB gain and 42.5dBm output power (typ.). Toshiba's UL product offering now includes products from 4 watts (W) up to 16W, for use in point-to-point and point-to-multi-point microwave digital radio for terrestrial communications and fixed wireless access systems.

In addition, for fixed wireless system applications that require maximum output power levels, Toshiba has added two new devices to its Super Linear (SL) device family. For U-NII applications, the 60W TIM5359-60SL rounds out Toshiba's 5.3GHz to 5.9GHz product offering, with 9.0dB gain and output power (typ.) of 48.0dBm. This device can be used in a series in amplifier applications with the three new UL devices. For 3.5GHz fixed wireless systems such as WiMAX, Toshiba's 16W TIM3438-16SL features gain of 12.5dB and output power (typ.) of 42.5dBm.

"Recent progress in standardization of broadband wireless is expected to spur significant interest and growth in this market," said Toshi Nakamura, business development manager, Microwave Devices, for Toshiba America Electronic Components, Inc. "Although proprietary terrestrial microwave networks have been in existence for many years, recent support for WiMAX and U-NII FWA systems in leading personal computer and network chipset solutions, combined with other industry efforts to standardize FWA networks, is likely to help expand the market, particularly in geographic regions without widespread availability of DSL or cable."

"Our new devices provide a powerful combination of high gain, high linearity and output power up 48dBm," he continued. "This high output power level is sufficient to support advanced features including orthogonal frequency division multiplexing (OFDM), a modulation scheme that enables broad band wireless systems to support non-line-of-site service." Traditional microwave communication systems have been point-to-point, with a requirement for line-of-site connectivity. OFDM eliminates the line-of-sight requirement, but requires a much higher peak output power to operate.

Toshiba's new SL and UL GaAs FETs for FWA systems are Lead(Pb)-Free, and are RoHS-compatible, which means that they meet the requirements of the European Union's Reduction of Hazardous Substances (RoHS) Directive, scheduled to take effect July 1, 2006.

Samples of Toshiba's high linearity internally matched GaAs FETs for fixed wireless access systems are slated for availability in the third quarter of 2005, with sample prices beginning at $320.00 each for the 3.5GHz TIM3438-16SL.

Explore further: Nintendo's trailblazing Game Boy marks 25th anniversary

add to favorites email to friend print save as pdf

Related Stories

Apple patent proposes battery use monitoring system

Mar 23, 2014

(Phys.org) —Smartphone users are aware by now of the fact that beyond the richest phone, text, location and imaging feature sets, waning battery performance can play a significant role in dampening customer ...

Small, light health patch with enhanced accuracy

Apr 09, 2014

Holst Centre and IMEC have unveiled a prototype flexible health patch weighing just 10g – half the weight of current products. The patch uses real-time electrocardiogram (ECG), tissue-contact impedance ...

Big, fast, weird data

Apr 08, 2014

The "Big Data" research that continues to dominate IT agendas has traditionally focused on making sense of the growing volumes of computer data. Yet in recent years, the volume question has given way to the other V's of Big ...

Recommended for you

Ex-Apple chief plans mobile phone for India

13 hours ago

Former Apple chief executive John Sculley, whose marketing skills helped bring the personal computer to desktops worldwide, says he plans to launch a mobile phone in India to exploit its still largely untapped ...

Health care site flagged in Heartbleed review

Apr 19, 2014

People with accounts on the enrollment website for President Barack Obama's signature health care law are being told to change their passwords following an administration-wide review of the government's vulnerability to the ...

Airbnb rental site raises $450 mn

Apr 19, 2014

Online lodging listings website Airbnb inked a $450 million funding deal with investors led by TPG, a source close to the matter said Friday.

User comments : 0

More news stories

Ex-Apple chief plans mobile phone for India

Former Apple chief executive John Sculley, whose marketing skills helped bring the personal computer to desktops worldwide, says he plans to launch a mobile phone in India to exploit its still largely untapped ...

A homemade solar lamp for developing countries

(Phys.org) —The solar lamp developed by the start-up LEDsafari is a more effective, safer, and less expensive form of illumination than the traditional oil lamp currently used by more than one billion people ...

UAE reports 12 new cases of MERS

Health authorities in the United Arab Emirates have announced 12 new cases of infection by the MERS coronavirus, but insisted the patients would be cured within two weeks.

NASA's space station Robonaut finally getting legs

Robonaut, the first out-of-this-world humanoid, is finally getting its space legs. For three years, Robonaut has had to manage from the waist up. This new pair of legs means the experimental robot—now stuck ...