A Polar Transmitter Using Interleaving Pulse Modulation for Multimode Handsets

This paper presents a highly efficient polar transmitter using interleaving pulse modulation for multiple communication standards. Using the proposed interleaving pulse modulation technique, a polar transmitter can suppress the odd-order output spurs deeply with a feasible value of essential sampling frequency and keep the residual spurs from falling into the receive bands. To validate the proposed technique, a prototype polar transmitter was constructed and evaluated. Using global system for mobile communications, enhanced data rates for GSM evolution, and wideband code division multiple access (WCDMA) signals at 836.5 MHz, the polar transmitter achieved 68%, 45.5%, and 41.2% power-added efficiency at output power levels of 28, 26, and 25 dBm, respectively. The measurement results were able to pass the spectral requirements defined by the respective standards without the use of any pre-distortion or calibration techniques. Moreover, the polar transmitter was able to achieve an output dynamic range of 80 dB required by the WCDMA standard.

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