| Fan Xiangning (樊祥宁),Bao Kuan,Tang Li,Liu Junbo,Gu Chengjie.[J].高技术通讯(英文),2015,21(2):119~126 |
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| A reconfigurable active-Gm-RC filter for multistandard wireless receivers |
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| DOI：10.3772/j.issn.1006-6748.2015.02.001 |
| 中文关键词: |
| 英文关键词: low pass filter (LPF), multi-standard, active-Gm-RC, auto-tuning, WCDMA, GPS, Galileo, reconfigurability |
| 基金项目: |
| Author Name | Affiliation | | Fan Xiangning (樊祥宁) | | | Bao Kuan | | | Tang Li | | | Liu Junbo | | | Gu Chengjie | |
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| 中文摘要: |
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| 英文摘要: |
| A 4th-order low-pass filter (LPF) based on active-Gm-RC structure for multi-standard system application is presented in this paper. The performances of LPF are controlled by a 1-bit control-voltage, and the cut-off frequency, channel selectivity, and linearity of the proposed filter can be reconfigured accordingly. In order to improve the accuracy of the cut-off frequency, a binary-weighted switched-capacitor array is employed as the auto-tuning circuits to calibrate the RC-time constant. Fabricated in TSMC 0.18μm RF CMOS process, the proposed LPF achieves a measured cut-off frequency of 1.95 and 12.3MHz for WCDMA and GPS/Galileo application with a bandwidth deviation less than 4%. The measured 1dB compression points are -3.0dBm and -5.1dBm respectively for different modes. The core circuit of LPF consumes 1mW and 1.6mW for WCDMA and GPS/Galileo respectively. And the proposed LPF occupies an area of 0.78mm2. |
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