標題: A calibrated direct conversion front-end transmitter with resonant matching techniques for mobile WiMAX/WiBro applications
作者: Chang, Chia-Hung
Jou, Christina F.
電機工程學系
Department of Electrical and Computer Engineering
關鍵字: Direct conversion;Resonant matching;WiMAX;WiBro;Transmitter;Calibration
公開日期: 1-五月-2012
摘要: A direct conversion front-end transmitter with the properties of high linearity and high single sideband rejection ratio is described in this paper. The transmitter employs two resonant matching techniques to improve its operating bandwidth. The first resonant circuit design is applied at the inter-stage of the LO input buffer in order to achieve a wideband frequency response which ranges from dc to 6 GHz. The second resonant circuit is applied at the power amplifier (PA) driver output stage to increase the matching bandwidth and meet both the Worldwide Inter-operability for Microwave Access (WiMAX) and Wireless Broadband (WiBro) applications simultaneously. In addition, the sideband signal and carrier leakage of this transmitter are further minimized by a proposed calibration circuit design to achieve the error vector magnitude (EVM) specifications. The measured single sideband performance with calibration mechanism demonstrates approximately 15 dB improvement on sideband and carrier suppression. The rejected sideband and carrier signals can be up to 55.19 and 56.31 dBc, respectively. The measured dynamic gain range of the transmitter is 53 dB in 1-dB step with a maximum relative gain error lower than 0.4 dB. The transmitter delivers +0.766 dBm output power with EVM of -34.687 dB for the orthogonal frequency division multiple access (OFDMA) 64QAM-3/4 modulated signals. The measured constellation is minimized to be < 1.5% with output power from -2.3 to -36.2 dBm.
URI: http://hdl.handle.net/11536/16003
ISSN: 0925-1030
期刊: ANALOG INTEGRATED CIRCUITS AND SIGNAL PROCESSING
Volume: 71
Issue: 2
結束頁: 211
顯示於類別:期刊論文


文件中的檔案:

  1. 000302812400006.pdf