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本文提出了一种无驱动放大器的多频多模发射机架构，解决了传统发射机中驱动放大器带来的功耗和面积问题，同时抑制了OFDM调制引起的反互调（CIM）杂散。
Haolu Xie, Patrick Rakers, Mahib Rahman, Michael Gomez, Chuanzhao Yu, Benjamin Gilsdorf, Kurt Sakamoto Fujitsu Semiconductor Wireless, Tempe, AZ Fourth-generation mobile devices use wide channel bandwidths and OFDM modulation to achieve high data rates. In particular, OFDM modulation in LTE20 creates up to 100 Resource Blocks (RB) each containing 12 subcarriers with 15kHz spacing, spread over the channel bandwidth. For an RB with frequency offset fs from the LO, transmitter non-linearity causes counter-intermodulation (CIM) products at -3fs, +5fs, -7fs, … from the LO. These spurious signals directly, or through remixing due to PA non-linearity, may fall on other bands. The worst case is when one or just a few RBs are transmitted at the edge of the channel. The CIM effect, specific to 4G signals, makes the design of multimode transmitters more challenging since such transmitters also need to meet the substantially different 2G and 3G requirements. Previous works on LTE have mainly focus
Omid Oliaei, Mark Kirschenmann, David Newman, Kurt Hausmann,