| Citation: |
Cheng Xin, Zhong Lungui, Yang Haigang, Liu Fei, Gao Tongqiang. A pseudo differential Gm–C complex filter with frequency tuning for IEEE802.15.4 applications[J]. Journal of Semiconductors, 2011, 32(7): 075005. doi: 10.1088/1674-4926/32/7/075005
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Cheng X, Zhong L G, Yang H G, Liu F, Gao T Q. A pseudo differential Gm–C complex filter with frequency tuning for IEEE802.15.4 applications[J]. J. Semicond., 2011, 32(7): 075005. doi: 10.1088/1674-4926/32/7/075005.
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A pseudo differential Gm–C complex filter with frequency tuning for IEEE802.15.4 applications
DOI: 10.1088/1674-4926/32/7/075005
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Abstract
This paper presents a CMOS Gm–C complex filter for a low-IF receiver of the IEEE802.15.4 standard. A pseudo differential OTA with reconfigurable common mode feedback and common mode feed-forward is proposed as well as the frequency tuning method based on a relaxation oscillator. A detailed analysis of non-ideality of the OTA and the frequency tuning method is elaborated. The analysis and measurement results have shown that the center frequency of the complex filter could be tuned accurately. The chip was fabricated in a standard 0.35 μm CMOS process, with a single 3.3 V power supply. The filter consumes 2.1 mA current, has a measured in-band group delay ripple of less than 0.16 μs and an IRR larger than 28 dB at 2 MHz apart, which could meet the requirements of the IEEE802.15.4 standard.-
Keywords:
- IEEE802.15.4 standard
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References
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Proportional views
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