Analysis and design of a high-linearity receiver RF front-end with an improved 25%-duty-cycle LO generator for WCDMA/GSM applications
作者： Song Hu , Weinan Li , Yumei Huang , Zhiliang Hong
DOI: 10.1088/1674-4926/33/2/025007
关键词: GSM 、 Frequency synthesizer 、 Digital biquad filter 、 Phase noise 、 Electronic engineering 、 Electrical engineering 、 CMOS 、 RF front end 、 Engineering 、 Duty cycle 、 Transimpedance amplifier
摘要: A fully integrated receiver RF front-end that meets WCDMA/GSM system requirements is presented. It supports SAW-less operation for WCDMA. To improve the linearity in terms of both IP3 and IP2, comprised multiple-gated LNAs with capacitive desensitization, current-mode passive mixers proposed IP2 calibration circuit reconfigurable Tow-Thomas-like biquad TIAs. new power-saving multi-mode divider low phase noise to provide 4-phase 25%-duty-cycle LO. In addition, a constant-gm biasing an on-chip resistor adopted make conversion gain invulnerable process temperature variations transimpedance. This frequency synthesizer 0.13 m CMOS. The measurement results show owing this high-linearity front-end, achieves 6 dBm IIP3 better than C60 IIP2 all modes bands.
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