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Predistorter ICs battle RF phase compression

Sunnyvale, Calif. – Maxim Integrated Products' MAX2009 and MAX2010 monolithic RF predistorter ICs provide AM-AM and AM-PM distortion correction by introducing adjustable gain and phase expansion into a power amplifier lineup. These characteristics are specifically designed to counteract the gain and phase compression exhibited by today's LDMOS power amplifiers, the company said.

Jim Ahne, business manager for Maxim's high-frequency signal-conditioning product line, said the MAX-2009/2010 offer fully independent controls for both gain and phase expansion-all in a single package that provides up to a 55 percent reduction in parts count and a 25x reduction in footprint over comparable discrete solutions. For an input signal with a 10-dB peak-to-average ratio, the AM-AM correction can be set to yield 1 to 6 dB of total gain expansion. Likewise, the AM-PM correction can be modified to provide 4 degrees to 19 degrees of phase expansion.

“Both expansion curves are precision-controlled by making simple adjustments to the gain and phase breakpoints and slopes,” Ahne said.

By combining the MAX2009 with Motorola's MW4IC2230MB multistage driver IC and Maxim's discrete MRF5P21180, “designers can expect up to 5.7 dB of IM3 third-order intermodulation and 4 dB of ACPR adjacent-channel power ratio enhancement or, at an equivalent linearity, 5.5 percent drain efficiency improvement,” said David Runton, RF systems-engineering manager at Motorola.

The MAX2009 and MAX2010 come in a 28-pin TQFN-EP (5 x 5-mm) package and are specified for the extended -40 degrees C to 85 degrees C temperature range. In lots of 1,000, prices start at $9.95.

Call (800) 998-8800
www.maxim-ic.com

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