Maxim says it has introduced what it claims are the world's first monolithic RF predistorter ICs. Each MAX2009/2010 device provides AM-AM and AM-PM distortion correction by introducing adjustable gain and phase expansion into a power amplifier (PA) lineup. These expansion characteristics are specifically designed to counteract the gain and phase compression exhibited by LDMOS power amplifiers. A joint Maxim/Motorola study has shown that the devices provide substantial improvements in both PA linearity and efficiency. By combining the MAX2009 with Motorola's MW4IC2230MB multistage driver IC and its discrete MRF5P21180, designers can expect up to 5,7 dB of IM3 and 4 dB of ACPR enhancement or, at an equivalent linearity, 5,5% drain efficiency improvement, it said. The results are representative of a Class-AB PA supporting two WCDMA 3GPP modulated tones with 10 MHz of channel spacing. According to Maxim these basic linearisation enhancements are applicable, moreover, for virtually any signal format covering the 500 to 1100 MHz (MAX2010) and 1200 to 2500 MHz (MAX2009) bands. For an input signal with a 10dB peak-to-average ratio, the AM-AM correction can be set to yield 1 to 6 dB of total gain expansion. Likewise, AM-PM correction can be modified to provide 4 degrees to 19 degrees of phase expansion.
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