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Industry News / RFIC Channel

Richardson RFPD introduces solutions to simplify Doherty implementation

RFIC

April 7, 2014
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Richardson RFPD Inc. announces that it is accepting orders for two new solutions for simplifying next generation Doherty architecture.

Doherty amplifiers have become mainstream as operators drive RF amplifier OEMs to improve efficiency without compromising linearity. The Freescale MMDS20254H Advanced Doherty Alignment Module (ADAM) and the Anaren X3DC23P1S Xinger® III Doherty combiner are unique solutions that greatly simplify Doherty implementation, both symmetric and asymmetric.

The Freescale MMDS20254H was developed to enable accurate alignment of phase and amplitude on the carrier and peaking transistors of Doherty amplifiers. It contains a 90º coupler, digitally selectable phase shifters and step attenuators, and operates from a single 5V supply. The MMDS20254H is suitable for all transmit protocols from 1800 MHz to 2200 MHz, and for amplifiers of at least 1W average power at the antenna. The ADAM's numerous advantages include improved digital pre-distortion (DPD) correction with tighter performance distributions, increased system efficiency, and significant Doherty bandwidth improvement.

Additional key features of the MMDS20254H include:

  • Frequency: 1800–2200 MHz
  • Maximum RF input power: +25 dBm (CW)
  • 0.5 dB step-programmable attenuators with 7.5 dB maximum range
  • 7º per bit phase shifters with 49º maximum range
  • Supply current: 12 mA
  • 50 Ohm operation (no external matching required)
  • TTL/CMOS/SPI interface (1.8V, 3.3V logic)
  • 32-pin, 6 mm QFN surface mount plastic package

Additional information on Freescale's ADAM devices is available, including development software and a training video (also available with Chinese subtitles).

The Anaren X3DC23P1S is a low profile, high performance Doherty combiner in a new, easy to use, manufacturing-friendly surface mount package. It can be used in high power applications up to 50W and is the latest addition to Richardson RFPD's lineup of Xinger III Doherty combiners.

Additional key features of the X3DC23P1S include:

  • Frequency: 2300–2400 MHz
  • Return loss: 23 dB (min)
  • Insertion loss: 0.16 dB (max)
  • Amplitude imbalance: +/-0.35 dB (max)
  • Phase imbalance: 90° +/-3.0°
  • Size: 0.25" x 0.20" (6.35 mm x 5.08 mm)

Additional relevant information is available on the Richardson RFPD website, including technical articles addressing linearity versus efficiency in Doherty architecture and tuning Doherty combiners.

Richardson RFPD's design advisors provide extensive technical expertise and design-in assistance for Anaren and Freescale products, including these new solutions for Doherty architecture implementation. To find more information, or to order the devices today on the Richardson RFPD website, please visit the Anaren X3DC23P1S and Freescale MMDS20254H webpages.The devices are also available by calling 1-800-737-6937 (within North America); or please find your local sales engineer (worldwide) at Local Sales Support. To learn about additional products from Anaren, please visit the Anaren storefront webpage. To learn about additional products from Freescale, please visit the Freescale storefront webpage. 

  

Source: Richardson RFPD Inc.

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