西安交通大学微电子学系,西安,710049
网络首发:2013-08-10,
纸质出版:2013
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张鸿 1, 赵桐 1, 贺郁 1, 等. 一种低功耗跨导电阻电容型镜像抑制复数滤波器[J]. 西安交通大学学报, 2013,47(8):80-86.
An Image-Rejection Complex Filter with Low Power Based on Transconductance-Resistance-Capacitance Cells[J]. 2013, 47(8): 80-86.
张鸿 1, 赵桐 1, 贺郁 1, 等. 一种低功耗跨导电阻电容型镜像抑制复数滤波器[J]. 西安交通大学学报, 2013,47(8):80-86. DOI: 10.7652/xjtuxb201308014.
An Image-Rejection Complex Filter with Low Power Based on Transconductance-Resistance-Capacitance Cells[J]. 2013, 47(8): 80-86. DOI: 10.7652/xjtuxb201308014.
针对无线传感网(WSN)对射频接收机低功耗的要求
提出了一种适用于WSN低中频接收机的一阶跨导电阻电容型(G
m
-R-C)镜像抑制复数滤波器。该结构采用2个低功耗的全差动G
m
单元和R-C负载对同相/正交输入信号进行低通滤波
频率变换则通过另外2个交叉耦合的差动G
m
单元来实现。在详细分析一阶单元线性度、中心频率和调节范围的基础上
采用0.35 μm CMOS工艺设计了一个4阶巴特沃斯复数滤波器
带宽为160 kHz
中心频率为300 kHz。在1%的器件失配下
仿真得到的镜像抑制比达到50 dB
带内的输入3阶截取点功率为25.1 mW
通带增益为18 dB
输入参考噪声均方根电压值为35 μV; 在2.7 V电源电压下
滤波器消耗总电流仅为760 μA。仿真结果表明
滤波器的各项性能均满足WSN系统的需求并具有较低的功耗。
A 1st-order transconductance-capacitance-resistance(G
m
-R-C)complex filter for image rejection in low-IF wireless sensor network(WSN)receiver is proposed to reduce the power consumption of radio frequency receiver in WSN. The proposed cell adopts two fully differential G
m
-cells with low power and R-C loads to perform low-pass filtering for the input I/Q signals
while the frequency translation is realized by two additional differential G
m
cells through directly cross-adding relevant currents. Resistive source degeneration is adopted in the G
m
cells to improve linearity. Based on the proposed 1st-order cell
a 4th-order Butterworth complex filter with
center frequency of 300 kHz and bandwidth of 160 kHz is designed using the 0.35 μm CMOS technology. Simulation results under 1% I/Q mismatch show that the filter achieves an image rejection ratio of 50 dB
an in-band 3rd-order input intercept power of 25.1 mW
a pass-band gain of 18 dB
and an RMS voltage of input referred noise of 35 μV with current consumption of only 760 μA from a 2.7 V supply. All the simulated parameters achieve the system requirements of WSN with low power consumption.
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