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DPD modulators for wireless base stations

Posted: 23 Jan 2014     Print Version  Bookmark and Share

Keywords:IDT  RF  DPD demodulator  4G  3G 

Integrated Device Technology is expanding its RF signal chain portfolio with a digital pre-distortion (DPD) demodulator. The new integrated demodulator improves system performance while reducing solution cost, physical size and power consumption in 4G, 3G, and 2G wireless base stations and repeaters, claimed the company.

The IDTF1320 and IDTF1370 are low-power DPD demodulators optimised for 400MHz to 1200MHz and 1300MHz to 2900MHz wireless systems, respectively. The integrated solutions include a demodulator, digital step attenuator (DSA), and high-isolation single-pole double-throw (SP2T) switch to minimise system solution cost, board footprint, and bill-of-materials.

The devices offer over one Watt of power savings compared to conventional solutions. This results in reduced heat dissipation and energy usage, helping to ease cooling requirements, promote smaller equipment form factors, and lower operating costs. "In addition, the new DPD ICs offer excellent linearity and high bandwidth, making them an ideal, flexible solution for linearizing any type of BTS transmitter."

Christian Kermarrec, vice president and general manager at IDT, said, "Innovative design techniques have allowed us to integrate important functions into a single chip, producing a highly-compact, low-power solution with exceptional linearity and high bandwidth. This enables our customers to reduce solution cost, simplify the PCB, and minimise heat dissipation – critical factors in next-generation wireless base station equipment designs."

The new DPDs include a high-isolation SP2T switch, allowing for easy integration into multiple input, multiple output (MIMO) systems, while the integrated Glitch-Free DSA enables dynamic adjustment to optimise the power of the incident signal reaching the demodulator. Furthermore, the Zero-Distortion demodulator is able to drive the analogue-to-digital converters (ADCs) directly, eliminating the need for intermediate frequency variable gain amplifiers (IF VGAs) in most applications.

In addition, the high dynamic range of the IDTF1320 and IDTF1370 results in enhanced DPD loop performance, minimising the adjacent channel leakage-power ratio (ACLR) and error vector magnitude (EVM).

The IDTF1320 and IDTF1370 are currently available to qualified customers in a compact, 6x6 mm 36-ld VFQFPN package.

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