| Citation: |
Hu Song, Li Weinan, Huang Yumei, Hong Zhiliang. Analysis and design of a high-linearity receiver RF front-end with an improved 25%-duty-cycle LO generator for WCDMA/GSM applications[J]. Journal of Semiconductors, 2012, 33(2): 025007. doi: 10.1088/1674-4926/33/2/025007
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Hu S, Li W N, Huang Y M, Hong Z L. Analysis and design of a high-linearity receiver RF front-end with an improved 25%-duty-cycle LO generator for WCDMA/GSM applications[J]. J. Semicond., 2012, 33(2): 025007. doi: 10.1088/1674-4926/33/2/025007.
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Analysis and design of a high-linearity receiver RF front-end with an improved 25%-duty-cycle LO generator for WCDMA/GSM applications
doi: 10.1088/1674-4926/33/2/025007
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Abstract
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, the RF front-end is comprised of multiple-gated LNAs with capacitive desensitization, current-mode passive mixers with the proposed IP2 calibration circuit and reconfigurable Tow-Thomas-like biquad TIAs. A new power-saving multi-mode divider with low phase noise is proposed to provide the 4-phase 25%-duty-cycle LO. In addition, a constant-gm biasing with an on-chip resistor is adopted to make the conversion gain invulnerable to the process and temperature variations of the transimpedance. This RF front-end is integrated in a receiver with an on-chip frequency synthesizer in 0.13 m CMOS. The measurement results show that owing to this high-linearity RF front-end, the receiver achieves ??6 dBm IIP3 and better than +60 dBm IIP2 for all modes and bands.-
Keywords:
- receiver,
- multi-mode,
- multi-band,
- SAW-less,
- IP2 calibration,
- 25% duty-cycle,
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References
[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] [25] -
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