An Image-Rejection Complex Filter with Low Power Based on Transconductance-Resistance-Capacitance Cells

doi:10.7652/xjtuxb201308014

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An Image-Rejection Complex Filter with Low Power Based on Transconductance-Resistance-Capacitance Cells

更新时间：2025-05-08

- An Image-Rejection Complex Filter with Low Power Based on Transconductance-Resistance-Capacitance Cells
- Vol. 47, Issue 8, Pages: 80-86(2013)
- 作者机构：
  
  西安交通大学微电子学系,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201308014
  CLC： TN713.8
- Online First：10 August 2013，
  
  Published：2013
- 稿件说明：
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An Image-Rejection Complex Filter with Low Power Based on Transconductance-Resistance-Capacitance Cells[J]. 2013, 47(8): 80-86.
DOI：

An Image-Rejection Complex Filter with Low Power Based on Transconductance-Resistance-Capacitance Cells[J]. 2013, 47(8): 80-86. DOI： 10.7652/xjtuxb201308014.

摘要

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

-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

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

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。

Abstract

A 1st-order transconductance-capacitance-resistance(G

-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

-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

cells through directly cross-adding relevant currents. Resistive source degeneration is adopted in the G

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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references

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