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Cree Licenses Key Doherty Amplifier Patents to RFHIC

Dec 12, 2011
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DURHAM, N.C. -- Cree, Inc. (Nasdaq: CREE) today announced a nonexclusive worldwide license agreement with RFHIC Corporation, a global leader in cutting-edge RF power amplifiers, that provides access to Cree’s pioneering Doherty amplifier-related patents. Cree’s RF innovation and novel Doherty architecture can serve as the foundation for advanced 4G base stations that are substantially more efficient than conventional designs. 4G mobile data networks are being deployed around the world to address the burgeoning demand for mobile broadband services.

“Cree is a leader in the development of GaN HEMT technology for RF and microwave applications,” said Jim Milligan, Cree, director of RF. “From our early work in maximizing the efficiency of silicon LDMOS amplifiers to our current initiatives using GaN-based devices, Cree has successfully developed innovative circuits that enhance the performance of the classic Doherty architecture.”

With Cree’s advanced circuits, amplifier efficiency can be increased by as much as five percentage points when conventional silicon LDMOS or GaAs transistors are used. This improved performance can help meet the stringent efficiency and linearity requirements of upcoming 4G LTE base stations, and related wireless systems, that use high peak-to-average ratio signal modulation. When these circuit innovations are implemented using Cree’s high-frequency, high-power GaN HEMTs and the latest generation digital pre-distortion systems, the resulting efficiency improvements can be up to a staggering 15 percentage points greater than that achieved by a conventional Doherty amplifier implemented with silicon LDMOS.

The Doherty amplifier is a fundamental RF amplifier architecture invented by William Doherty in 1936 using vacuum tubes. Modern implementations of the Doherty amplifier use power transistors. The fundamental Doherty architecture uses two parallel, equal power split transistors, a carrier amplifier transistor for low level signals and a peaking amplifier transistor for high level signals. The fundamental, equal power split Doherty architecture offers up to a 40 percent improvement in efficiency over traditional non-Doherty Class A/B approaches. Interest in Doherty amplifiers has grown with increased demand for higher-efficiency systems employing digital modulation formats, such as those used for 3G W-CDMA networks. Online applications including video chat and streaming video are driving a need for still higher-efficiency amplifiers to support 4G LTE systems.

“Cree innovations in Doherty amplifier technology can set the standard for the newest generation of 4G network deployments requiring high-efficiency macro and pico cell base stations. Cree’s advancements on the fundamental two-transistor, parallel Doherty architecture can yield significant efficiency improvements,” Milligan added.

The nonexclusive license agreement between RFHIC, headquartered in Suwon, South Korea, and Cree underscores each company’s commitment to developing products that enhance the telecommunications infrastructure, while respecting the value and importance of intellectual property.

Information about Cree’s Doherty amplifier circuit patent license program may be found at or may be obtained by sending an email to

About Cree
Cree is a market-leading innovator of semiconductor products for power and radio-frequency (RF) applications, lighting-class LEDs, and LED lighting solutions.

Cree's product families include LED fixtures and bulbs, blue and green LED chips, high-brightness LEDs, lighting-class power LEDs, power-switching devices and RF devices. Cree products are driving improvements in applications such as general illumination, electronic signs and signals, power supplies and solar inverters.

For additional product and company information, please refer to

This press release contains forward-looking statements involving risks and uncertainties, both known and unknown, that may cause actual results to differ materially from those indicated. Actual results may differ materially due to a number of factors, including customer acceptance of new products; the rapid development of new technology and competing products that may impair demand or render Cree’s products obsolete; and other factors discussed in Cree’s filings with the Securities and Exchange Commission, including its report on Form 10-K for the year ended June 26, 2011, and subsequent filings.

Cree is a trademark registered in the U.S. Patent and Trademark Office by Cree, Inc.

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