Sumitomo Electric Develops High-Efficiency Broadband Power Amplifier Compliant with Next Generation Mobile Communication

  Sumitomo Electric Develops High-Efficiency Broadband Power Amplifier
  Compliant with Next Generation Mobile Communication Standards

Business Wire

TOKYO -- February 4, 2013

Sumitomo Electric Industries, Ltd. (TOKYO:5802)(ISIN:JP3407400005) has
developed a high-efficiency broadband power amplifier to be used in a cellular
phone base station. Conforming to the next generation mobile communication
standard LTE-Advanced, this amplifier covers a wide radio frequency (RF)
bandwidth of 2.6 GHz at low power consumption.

Using this technology, Sumitomo Electric continues to work for the promotion
of even higher frequency (over 3.5 GHz), wider band, and lower power
consumption, while also working on the development of a mass production
technology for this amplifier with the aim of installing it in a remote radio
head (RRH)^*1, a wireless transceiver unit that Sumitomo Electric manufactures
for use in a cellular phone base station.

With the rapid growth in mobile data traffic due to the recent widespread use
of smartphones and other mobile devices, there is an urgent need to increase
the communication capability of systems used in cellular phone base stations.
As a technical solution to this situation, the extension of the radio
frequency bandwidth is considered. The bandwidth extension technology has been
applied to the LTE-Advanced, the successor of the currently used LTE mobile
communication standard, to increase the bandwidth from 20 MHz up to 100 MHz.

However, associated with the upgrade of cellular systems, there is a major
problem of increased power consumption of cellular phone base stations due to
the increasing data transmission rate and widened bandwidth. Therefore,
radical improvement is required for the power efficiency of RF power
amplifiers, which consume most of power required in a base station. Currently,
the Doherty amplifier^*2 is commonly used due to its high efficiency, however,
it can cover only low frequency bands of several tens of MHz, which is
insufficient in terms of bandwidth and power efficiency to support the
LTE-Advanced system.

Under such circumstances, Sumitomo Electric has succeeded in extending the RF
bandwidth of the Doherty amplifier by drawing on its RF power amplifier
technology and optimizing the fundamental frequency and the high-order
harmonics over a wide frequency range inside the amplifier modules
incorporated in the Doherty amplifier.

The features and major specifications of the high-efficiency broadband power
amplifier are as follows:

(1) High power efficiency of 53% or more at a wide band of over 100 MHz (see

(2) Component cost equivalent to that of the conventional Doherty amplifier

(3) Applicability for broadband wireless communication systems such as LTE and

Table1 Specifications of the high-efficiency broadband power amplifier
RF power amplifier architecture       Doherty
Output power                           65 W
Transmission frequency                 2.6 GHz
Transmission bandwidth                 100 MHz
Drain efficiency^*3                    53%
Adjacent channel leakage power ratio   -50 dBc
Test condition                        LTE, 10 MHz × 2 carriers, PAPR = 6.5 dB


*1 Remote radio head (RRH): A system that transmits and receives wireless
signals. It consists of a transmitter with a high-power RF amplifier, a
receiver that amplifies the radio waves transmitted from cellular phones, and
a duplexer that allows bidirectional communication over a single antenna.

*2 ^ Doherty amplifier: An RF amplifier that consists of two types of
amplifiers: a carrier amplifier that is in continuous operation and a peak
amplifier that supports the carrier amplifier when the output power is high.
This saves power consumption at low power output, and accordingly, improves
the efficiency of radio communication systems, particularly those with a large
difference between the maximum and average output power levels, like the LTE

^*3 Drain efficiency: The ratio of output RF power to supply DC power of an

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Sumitomo Electric Industries, Ltd.
Mitsuyo Tsuruta, +81 6 6220 4119
Public Relations Department
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