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Analog Devices Press Release - December 15, 2010
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High-Performance RF Power Detector Simultaneously Delivers RMS and Envelope Outputs
- ADI’s ADL5511 TruPwr™ rms and envelope detector is highly accurate and simplifies envelope extraction
of high peak-to-average modulated signals in wireless, instrumentation, military and broadband applications.
NORWOOD,
Mass.--(BUSINESS WIRE)-- Analog Devices, Inc. (ADI), a world-leader in high-performance semiconductors for signal
processing applications and RF ICs (radio frequency integrated circuits), today introduced a new highly
integrated, high-performance RF detector for use in wireless, instrumentation, defense, and other broadband
applications. ADI’s new ADL5511 TruPwr rms (root mean square) and envelope detector (an electronic circuit that
takes a RF signal as input and provides an output that represents the envelope of the signal) offers a high level
of integration and functionality by combining two RF functions into one small chip, thereby simplifying designs
and reducing BOM (bill of materials) cost. View the data sheet and order samples at
www.analog.com/adl5511.
Improving the PAE (power added efficiency) of high-powered amplifiers continues to be a challenge for
wireless and broadband equipment manufacturers. Next-generation WiMAX systems and LTE mobile data and voice
systems are adopting OFDM (orthogonal frequency division multiplexed) modulation that supports a large number of
subcarriers. The high peak-to-average ratio of these modulated signals causes PAs (power amplifiers) to be backed
off from their maximum transmit powers significantly, thereby making the PA less efficient. To improve PA
efficiency, an envelope detector has become increasing popular. In drain modulation architectures, an envelope
detector modulates the PA power supply from the incoming RF signal, thereby only giving the PA the power needed to
properly transmit the RF signal. Traditional architectures leave the PA biased at a much higher power level in
order to ensure the PA can properly transmit peak power, but are not capable of reducing PA bias when transmitting
lower RF power.
Envelope
Output Operating within the 1 MHz to 4 GHz frequency range, ADI’s new ADL5511 TruPwr rms and envelope
detector provides a unique approach to improving PAE with a smaller footprint and reduced cost and is a highly
accurate, easy-to-use means of extracting the envelope of a modulated signal. The envelope output is presented as
a voltage that is proportional to the envelope of the input signal. The rms output is a linear in V/V output
voltage that is independent of the peak-to-average ratio of the input signal. The extracted envelope can be used
for power amplifier linearization and efficiency enhancements, and the rms output can be used for true power
measurement. The ADL5511 offers best-in-class performance including ±0.25 dB rms detection accuracy versus
temperature; ±0.25 dB envelope detection accuracy versus temperature and a ± 1 dB dynamic range of 40 dB. The
ADL5511 is specified across the industry’s widest temperature range of –40°C to +125°C, making it ideal for
high-temperature environments found in remote radio heads and power amplifiers. For complete specifications,
please view the data sheet and order samples at
www.analog.com/adl5511.
Availability and Pricing The ADL5511 is sampling now and is available for $7.33 per
unit in 1,000-unit quantities.
RF IC Portfolio Covers Entire RF Signal Chain Using a unique combination of design skills,
system understanding and process technologies, Analog Devices offers the broadest portfolio of RF ICs covering the
entire RF signal chain from industry-leading high-performance discrete RF function blocks to highly-integrated
multi-functional single-chip RF solutions. ADI’s RF portfolio includes TruPwr™ rms power detectors and logarithmic
amplifiers; PLL and DDS synthesizers; RF prescalers; VGAs; ADC drivers, gain blocks, LNAs and other RF amplifiers;
RF mixers; direct conversion modulator and demodulator products; integrated transceivers, transmitters and
receivers and more. These products are supported by a wide range of free design tools, evaluation boards and other
design resources to ease the development of RF systems. For more information, visit: http://www.analog.com/rf.
About Analog Devices, Inc.
Innovation, performance, and excellence are the
cultural pillars on which Analog Devices has built one of the longest-standing, highest-growth companies within
the technology sector. Acknowledged industry-wide as the world leader in data-conversion and signal-conditioning
technologies, Analog Devices serves over 60,000 customers, representing virtually all types of electronic
equipment. Celebrating over 40 years as a leading global manufacturer of high-performance integrated circuits for
analog- and digital-signal processing applications, Analog Devices is headquartered in Norwood, Massachusetts,
with design and manufacturing facilities throughout the world. Analog Devices' common stock is listed on the New
York Stock Exchange under the ticker “ADI” and is included in the S&P 500 Index. http://www.analog.com
Follow ADI on Twitter at
http://www.twitter.com/ADI_News.
Contact
Analog Devices, Inc. Colleen Cronin
781-937-1622
Colleen.cronin@analog.com
Date Posted 12/15/2010
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