September 11, 2003 - Maxim Integrated Products introduces the MAX2009/MAX2010, the world's first monolithic RF predistorter ICs. Each 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 today's LDMOS (Laterally Diffused Metal Oxide Silicon) power amplifiers.
The results described here are representative of a Class AB PA supporting two WCDMA 3GPP modulated tones with 10MHz of channel spacing. These basic linearization enhancements are applicable, moreover, for virtually any signal format covering the 500MHz to 1100MHz (MAX2010) and 1200MHz to 2500MHz (MAX2009) bands of operation (cdma2000TM, GSM/EDGE, iDENTM, WLAN, etc.).
With these settings in place, the linearization circuit can either be run in a static 'set and forget' mode, or employ a more sophisticated closed-loop implementation with real-time software-controlled distortion correction. Hybrid correction modes are also possible using simple lookup tables to compensate for factors such as PA temperature drift or PA loading.
The MAX2009/MAX2010 are both available in a 28-pin TQFN-EP (5mm x 5mm) package and are specified for the extended (-40°C to +85°C) temperature range. Prices start at $9.95 (1000-up, FOB USA).
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