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本文提出一种用于3G应用的极坐标发射机，替代传统的直接上变频架构，以降低功耗和芯片面积。通过新电路实现紧凑且自校准的极坐标发射机，适用于宽带CDMA。
of the direct upconversion type. This architecture is versatile but requires calibration of the imbalance in its quadrature branches and DC offset at its inputs, and it is vulnerable to mixer noise. We believe it consumes more power and chip area than is warranted, and propose the polar transmitter as an alternative. Although it has been widely discussed as the ideal transmitter for EDGE, the polar architecture has yet to make significant inroads there, let alone into wideband CDMA. We will describe new circuits that enable a compact, largely self-calibrated polar transmitter, whose lower power and chip area put it ahead of state-of-the-art direct upconversion transmitters [1-3]. Polar’s challenges lie in finding a reliable method of wideband phase modulation (PM), and in suppressing unequal delay in the two separate paths that the PM
Michael Youssef1,2, Alireza Zolfaghari1, Hooman Darabi1, Asad Abidi2, 1
Broadcom, Irvine, CA, 2University of California, Los Angeles, CA So far all mainstream transmitters for WCDMA are