基于可编程跨导运算放大器POTA低通有源滤波器设计
Lowpass Active Filter Design Based on Programmable Operational Transconductance Amplifiers(POTA)
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摘要: 该文给出了基于可编程跨导运算放大器(POTA)的有源滤波器设计方法，能在一定范围内实现跨导值程控调节, 提高调节精度和准确度。并且利用Jacobi法求解相似对角形矩阵，避免解高次方程的难题。所设计的有源滤波电路不易受分布电容的影响，稳定性好、灵敏度低。本文给出了设计实例，显示了该方法的优点。Abstract: In this paper, a method of active filter design based on Programmable Operational Transconductance Amplifiers(POTA) is given. The transconductance is adjusted by software in order to improve accuracy. The design procedure is based on Jacobi method and similar diagonal matrix. The difficulties of finding the roots of high order polynomial can be avoided by using Jacobi method. Active filter circuit is composed of POTA and ground capacitors. It has the characteristics of high stability and low sensitivities. A design example is given and the simulated results show that the given method is suitable for continuous time active filter design.
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Analog Devices Inc.,1-/2-/4- Channel Digital Potentiometers,Data Sheet.2002.[2]Oziel S, Szczepanski S, Schaumann R. Design of highly linear tunable CMOS OTA, 2002. ISCAS 2002. IEEE International Symposium on, Circuits and Systems, May 26-29, 2002, Vol. 3: 731-734.[3]J．H．威尔金森[英]著，石钟慈, 登健新译. 代数特征值问题.北京：科学出版社，2001: 275-354.[4]Hayahara E, Enomoto M. Deriving technique of equivalent forms from general filter circuits and its application[J].IEEE Trans. on Circuits and Systems.1999, 46(9):1037-1041 -
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