Third-order active-RC complex filter with automatic frequency tuning for ZigBee transceiver applications
来源期刊：中南大学学报(英文版)2015年第3期
论文作者：LI Di(李迪) JING Zhan(井站) YANG Yin-tang(杨银堂) WU Xiao-feng(吴笑峰) SHI Zuo-chen(石佐辰) LIU Yang(柳杨)
文章页码：966 - 973
Key words：active-RC; complex filter; ZigBee; frequency tuning; channel rejection
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.
LI Di(李迪)1, JING Zhan(井站)1, YANG Yin-tang(杨银堂)1, WU Xiao-feng(吴笑峰)2, SHI Zuo-chen(石佐辰)1, LIU Yang(柳杨)1
(1. School of Microelectronics, Xidian University, Xi’an 710071, China;
2. School of Information and Electrical Engineering, Hunan University of Science and Technology,
Xiangtan 411201, China)
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.
Key words:active-RC; complex filter; ZigBee; frequency tuning; channel rejection
