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Third-order active-RC complex filter with automatic frequency tuning for ZigBee transceiver applications

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Abstract

A 3rd-order Butterworth active-RC complex band-pass filter was presented for ZigBee (IEEE802.15.4) transceiver applications. The filter adopted cascaded complex pole stages to realize the 3 MHz bandwidth with a centre frequency of 2 MHz which was required by the ZigBee transceiver applications. An automatic frequency tuning scheme was also designed to accommodate the performance deterioration due to the process, voltage and temperature (PVT) variations. The whole filter is implemented in a 0.18 μm standard process and occupies an area of 1.3 mm×0.6 mm. The current dissipation is 1.2 mA from a 1.8 V single power supply. Measurement results show that the image rejection ratio (IRR) of the filter is 24.1 dB with a pass-band ripple less than 0.3 dB. The adjacent channel rejection is 29.8 dB@7 MHz and alternate channel rejection 47.5 dB@12 MHz, respectively.

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Correspondence to Di Li  (李迪).

Additional information

Foundation item: Projects(61334003, 61274026) supported by the National Natural Science Foundation of China; Project(K5051225006) supported by the Fundamental Research Fund for the Central Universities, China

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Li, D., Jing, Z., Yang, Yt. et al. Third-order active-RC complex filter with automatic frequency tuning for ZigBee transceiver applications. J. Cent. South Univ. 22, 966–973 (2015). https://doi.org/10.1007/s11771-015-2607-6

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  • DOI: https://doi.org/10.1007/s11771-015-2607-6

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