In this paper, a bulk driven quadrature filter is proposed for low power applications. A 3rd complex filter is designed by cascade connection of 2nd order right shifted Low Pass Filter with first order right shifted notch filter, which helps in improving the selectivity of the filter. The quadrature filter is implemented by employing Fully Differential Current Conveyor (FDCCII) as a basic building block. The proposed quadrature filter achieves a −3 dB bandwidth of 1.3 MHz with an Image Rejection Ratio (IRR) of 22.5 dB. The design consumes a total power of 10.94 μW with Total Harmonic Distortion (THD) of 0.121 \(\%\). The Figure Of Merit (FOM) of the proposed filter is 0.002fJ with a SFDR of 61 dB. The output noise of the design at 2 MHz centre frequency is 89.12 nV/\(\sqrt{Hz}\) and integrated Input Referred noise is 36.89 \(\upmu V_{rms}\). The design is simulated using a 180 nm CMOS technology with a supply voltage of 0.5 V. The proposed quadrature filter is used for low-Intermediate Frequency (IF) receiver for standard IEEE 802.15.1 (Bluetooth) applications.

本文针对低功耗应用提出了一种大容量驱动的正交滤波器。通过将二阶右移低通滤波器与一阶右移陷波滤波器级联连接，可以设计出第三复数滤波器，这有助于提高滤波器的选择性。正交滤波器通过采用全差动电流传输器（FDCCII）作为基本构件来实现。所提出的正交滤波器实现了1.3 MHz的-3 dB带宽和22.5 dB的镜像抑制比（IRR）。该设计消耗的总功率为10.94μW，总谐波失真（THD）为0.121 \（\％\）。所提出的滤波器的品质因数（FOM）为0.002fJ，SFDR为61 dB。该设计在中心频率为2 MHz时的输出噪声为89.12 nV / （（\ sqrt {Hz} \）并且集成的输入参考噪声为36.89  \（\ upmu V_ {rms} \）。使用180 nm CMOS技术，电源电压为0.5 V对该设计进行仿真。拟议的正交滤波器用于标准IEEE 802.15.1（蓝牙）应用的低中频（IF）接收器。