Capacitors realized using symmetric floating impedance scaling (SFIS) are area efficient. They are preferred for the implementation of fully differential filters for biomedical applications. The SFIS reported in the literature has poor accuracy and lower effective bandwidth. In this paper, a cross coupled symmetric floating impedance scaling (CC-SFIS) with enhanced bandwidth and accuracy is proposed. To evaluate its performance, a 500 $\text{pF}$ capacitor is implemented in UMC 180 $\text{nm}$ CMOS technology with a base capacitor $(C_b)$ of 10 $\text{pF}$ using both CC-SFIS and source follower based SFIS (SF-SFIS). The magnitude and phase of the impedance of the capacitor realized using CC-SFIS and SF-SFIS are obtained through post-layout simulations. CC-SFIS requires 53.68% lower area, 62.39% lower power consumption, and 88% higher accuracy than SF-SFIS. Fully differential 2^nd order Butterworth low pass filters with cutoff frequency of $100\text{Hz}$ are implemented in UMC 180 $\text{nm}$ technology using both CC-SFIS and SF-SFIS capacitors. Their performances are evaluated through simulation. From this, it is found that the deviation in the cut off frequency of the filter using CC-SFIS is smaller (2%) compared to that using SF-SFIS (40%) circuit.

使用对称浮动阻抗缩放（SFIS）实现的电容器具有较高的面积效率。它们是用于生物医学应用的全差分滤波器的首选。文献报道的SFIS具有较差的准确度和较低的有效带宽。本文提出了一种具有增强带宽和精度的交叉耦合对称浮动阻抗定标（CC-SFIS）。要评估其性能，请使用500$\text{F}$ 电容器在UMC 180中实现 $\text{纳米}$ 具有基础电容器的CMOS技术 $（C_b）$ 共10 $\text{F}$同时使用CC-SFIS和基于源跟随者的SFIS（SF-SFIS）。通过CC-SFIS和SF-SFIS实现的电容器阻抗的大小和相位是通过布局后仿真获得的。与SF-SFIS相比，CC-SFIS所需的面积减少了53.68％，功耗降低了62.39％，准确度提高了88％。全差分2^次阶巴特沃斯低通滤波器具有的截止频率$100\text{赫兹}$ 在UMC 180中实现 $\text{纳米}$技术同时使用CC-SFIS和SF-SFIS电容器。它们的性能通过仿真进行评估。由此可知，与使用SF-SFIS（40％）电路的滤波器相比，使用CC-SFIS的滤波器的截止频率的偏差较小（2％）。