FEATURES
Unfortunately, realizable RF amplifiers are not completely linear and the use of predistortion techniques allows the substitution of lower cost/power PA’s for higher cost/power PA’s. The ISL5239 pre-distortion linearizer enables the linearization of less expensive PA’s to provide more efficient operation closer to saturation. This provides the benefit of improved linearity and efficiency, while reducing PA cost and operational expense. The ISL5239 features a 125MHz pre-distortion bandwidth capable of full 5th order intermodulation correction for signal bandwidths up to 20MHz. This bandwidth is particularly well suited for 3G cellular deployments of UMTS and CDMA2000. The device also corrects for PA memory effects that limit predistortion performance including self heating. The ISL5239 combines an input formatter and interpolator, predistortion linearizer, an IF converter, correction filter, gain/phase/offset adjustment, output formatter, and input and feedback capture memories into a single chip controlled by a 16bit linearizer interface.
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