A 3rd-order Butterworth active-RC complex band-pass filter was presented for Zig Bee(IEEE802.15.4) transceiver applications. The filter adopted cascaded complex pole stages to realize the 3 MHz bandwidth with a centre...A 3rd-order Butterworth active-RC complex band-pass filter was presented for Zig Bee(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 Zig Bee 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 m A from a 1.8 V single power supply. Measurement results show that the image rejection ratio(IRR) of the filter is 24.1 d B with a pass-band ripple less than 0.3 d B. The adjacent channel rejection is 29.8 d B@7 MHz and alternate channel rejection 47.5 d B@12 MHz, respectively.展开更多
该文针对无线体域网人体介质通信(Human Body Communication,HBC)发射机严格的输出频谱指标,提出一种利用体偏置线性化技术进行频谱整形的技术。通过设计缓冲器中晶体管体偏置,从而调整晶体管二阶非线性系数,最终消除输出端的二阶互调项...该文针对无线体域网人体介质通信(Human Body Communication,HBC)发射机严格的输出频谱指标,提出一种利用体偏置线性化技术进行频谱整形的技术。通过设计缓冲器中晶体管体偏置,从而调整晶体管二阶非线性系数,最终消除输出端的二阶互调项(Second order Inter Modulation,IM2)。采用0.35μm CMOS工艺和1.8 V供电电压设计了一个基于体偏置技术的HBC发射机实例。仿真结果显示二阶输入截点(IIP2)优化到90 d Bm,输出频谱在1 MHz处抑制-130 d Br。较传统电路,该技术提高了23 d B频谱抑制,使输出频谱符合无线体域网IEEE802.15.6协议中-120 d Br的指标。展开更多
基金Projects(61334003,61274026) supported by the National Natural Science Foundation of ChinaProject(K5051225006) supported by the Fundamental Research Fund for the Central Universities,China
文摘A 3rd-order Butterworth active-RC complex band-pass filter was presented for Zig Bee(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 Zig Bee 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 m A from a 1.8 V single power supply. Measurement results show that the image rejection ratio(IRR) of the filter is 24.1 d B with a pass-band ripple less than 0.3 d B. The adjacent channel rejection is 29.8 d B@7 MHz and alternate channel rejection 47.5 d B@12 MHz, respectively.
文摘该文针对无线体域网人体介质通信(Human Body Communication,HBC)发射机严格的输出频谱指标,提出一种利用体偏置线性化技术进行频谱整形的技术。通过设计缓冲器中晶体管体偏置,从而调整晶体管二阶非线性系数,最终消除输出端的二阶互调项(Second order Inter Modulation,IM2)。采用0.35μm CMOS工艺和1.8 V供电电压设计了一个基于体偏置技术的HBC发射机实例。仿真结果显示二阶输入截点(IIP2)优化到90 d Bm,输出频谱在1 MHz处抑制-130 d Br。较传统电路,该技术提高了23 d B频谱抑制,使输出频谱符合无线体域网IEEE802.15.6协议中-120 d Br的指标。
