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August 2008 [Devices & ICs] Digital Predistortion Linearizes Broadband PAs, Part 2 Power amplifiers (PAs) are essential to the transmitter sections of communications systems and in many other RF/microwave applications. As seen last month in Part 1 of this three-part series, the linearity of a power amplifier is often compromised for efficiency, but numerous digital predistortion techniques are available to help improve linearity without sacrificing efficiency. Part 2 of this threepart article series will offer some comparisons of different ... July 2008 [Components] Digital Predistortion Linearizes Broadband PAs Power amplifier (PA) linearity and efficiency are often two parameters that must be traded off in a wireless system. Fortunately, a Volterra-based adaptive digital-predistortion (DPD) linearizer circuit can enable RF PAs in wireless systems to achieve high efficiency with good linearity. This adaptive digital predistortion solution extends the linear range of power amplifiers and, in combination with crest factor reduction, enables RF PAs to be ... |
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