World's First Operational Semiconductor-Based Weather Radar Goes into Operation at Nagoya University

TOKYO -- Toshiba Corporation today announced that it has developed and delivered the world's first operational weather radar system that replaces electron tubes in the transmitter with a high-power semiconductor module. The new radar is only one sixth the size of conventional equipment but offers comparable output power, along with improved waveband efficiency and enhanced features. The first unit of the new system has been installed at the Hydrospheric Atmospheric Research Center at Nagoya University, Japan. The Nagoya radar operates in the 9GHz frequency band (X-band) and is the first solid-state weather radar to go into practical operation.

While the new weather radar is much more compact and offers much higher performance than conventional systems, it maintains the same level of output power by adopting a combination of gallium nitride (GaN) power field effect transistors (FET) and pulse compression technology, which strengthens peak output power. Implementation of fully digital data processing suppresses the spurious level, allowing the frequency separation required for interference suppression to be shortened to one fourth. This contributes to efficient use of crowded radio frequencies.

The new radar reinforces performance by adding innovative features: dual polarization observation enhances the precision of rainfall estimation by capturing the shape and size of raindrops and cloud; clear-air turbulence observation detects very low levels of signal scattering, enabling to observe air conditions including wind speed even in clear weather -- a very difficult task for most weather radars.

The new system has a modular structure for the antenna, transmitter and received signal processor, which supports more flexible physical system layout depending on the installation site and operation. As the new radar does not use electron tubes, which have to be periodically replaced and disposed of, it reduces environmental loads, meeting Toshiba's goal of maximizing the eco-efficiency of its products and systems.

Because of the limitation of bandwidth availability with increasing use of radio wave frequency resources, steady demand for solid-state radars is expected, as they can contribute to more efficient use of frequencies. Toshiba will market the new high-power semiconductor-based weather radar in both 9GHz band (X-band) and 5GHz band (C-band) versions, both in Japan and overseas, including sales of individual modules that build the system.

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New Crosspoints from National’s PowerWise Energy-Efficient Product Family Consume Less Than 125 mW per Channel, with Jitter Performance as Low as 6 ps at Data Rates up to 3.125 Gbps

November 19, 2007
– National Semiconductor Corporation (NYSE:NSM) today added two low-power, low-voltage differential signaling (LVDS) 2 x 2 crosspoint switches to its PowerWise® energy-efficient product family. The DS25CP102 delivers the industry’s best jitter performance (6 ps typical) at data transmission rates up to 3.125 Gbps, while consuming only 125 mW of power per channel. The device features selectable transmit pre-emphasis and receive equalization to extend signal transmission reach in cables and FR-4 backplanes. The lower-speed (1.5 Gbps) DS10CP152 addresses short-haul applications that do not require signal conditioning. It delivers excellent jitter performance (9 ps typical), with very low power consumption of 57 mW per channel.

The DS25CP102 and DS10CP152 work as splitters or multiplexers for high-speed signal routing and switching in OC-48 telecom as well as standard-definition (SD), high-definition (HD) and 3-Gbps serial digital interface (SDI) professional video applications. They are also used in video and imaging transport applications to select between two data streams or as a splitter to drive two monitors. Their superior jitter and signal conditioning performance allow OEMs to use less costly cable, connectors and components. National built these 2 x 2 crosspoint switches with its proprietary silicon-germanium (SiGe) BiCMOS-8 process technology, which provides the highest performance-to-power ratios for high-speed interface devices.

National’s 2x2 crosspoints offer pin-selectable signal-conditioning features to reduce data-dependent jitter and eliminate the need for repeaters to extend signal transmission reach. Their inputs have a wide common-mode voltage range that allow the crosspoints to accept low-voltage positive-emitter-coupled logic (LVPECL), current-mode logic (CML) and LVDS signal levels without using coupling capacitors. The DS25CP102 and DS10CP152 accept signals directly from the leading 90 nm and 65 nm field-programmable gate arrays (FPGAs) and application-specific integrated circuits (ASICs). They feature 8 kV electrostatic discharge (ESD) protection and 100-Ohm termination on the LVDS input and output pins to minimize insertion losses, component count and board space.
These devices are the latest additions to National’s growing family of crosspoint switches, which include the recently announced DS25CP104 and DS10CP154 LVDS 4x4 crosspoints.

About National’s Interface Portfolio
National Semiconductor, the LVDS and CML technology innovator and market leader, offers a wide range of interconnect solutions that transfer high-speed digital signals using world-class analog technology. These solutions help system designers develop high-performance applications in a variety of markets, including communication and industrial systems. The products feature high reliability, low power and low noise, as well as dramatic systems savings in cable and connector costs. National Semiconductor is the world’s largest supplier of high-speed LVDS products, according to Databean’s 2006 Analog IC Market Share survey. For more information on National’s interface products, visit

Pricing and Availability
Available now, the DS25CP102 (3.125 Gbps) is supplied in a space-saving 16-pin LLP® package and the lower power DS10CP152 (1.5 Gbps) is supplied in a 16-pin narrow SOIC package. The DS25CP102 is priced at $5.25 and the DS10CP152 is $3.65, each in 1,000-unit quantities. For more information on the DS25CP102 or to order samples and an evaluation board, visit
. For more information on the DS10CP152 or to order samples and an evaluation board, visit

Note to editors: To view a high-resolution downloadable photo of these products, visit National's photo gallery.

About National’s PowerWise Brand
National’s PowerWise brand reflects the company’s energy-efficient product portfolio.  It signifies products with outstanding performance-to-power at the component level, as well as products that provide an outstanding, energy-efficient solution when coupled with other National parts. National’s PowerWise family of products features energy-efficient power management, operational amplifiers, interface and data conversion products. For more information about National’s PowerWise brand, visit:

About National Semiconductor
National Semiconductor, the industry's premier analog company, creates high-value analog devices and subsystems. National's leading-edge products include power management circuits, display drivers, audio and operational amplifiers, interface products and data conversion solutions. National's key analog markets include wireless handsets, displays, communications infrastructure, medical, automotive, industrial, and test and measurement applications. Headquartered in Santa Clara, Calif., National reported sales of $1.93 billion for fiscal 2007, which ended May 27, 2007. Additional company and product information is available at

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