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A polar transmitter using a new linear-assisted delta-modulation (LADM) envelope-amplifier has been developed for WCDMA applications. The LADM system is composed of a highly efficient switching block based on a 200-MHz-clock delta-modulator, which is implemented in a 0.18-mum CMOS IC, and a highly accurate linear block. In the LADM approach, the residual quantization noise and distortion of switching...
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