Abstract
Current difference buffered amplifier (CDBA) based universal inverse filter configuration is proposed. The topology can be used to synthesize inverse low-pass (ILP), inverse high-pass (IHP), inverse band-pass (IBP), inverse band-reject (IBR), and inverse all-pass filter functions with appropriate admittance choices. Workability of the proposed universal inverse filter configuration is demonstrated through PSPICE simulations for which CDBA is realized using current feedback operational amplifier (CFOA). The simulation results are found in close agreement with the theoretical results.
Highlights
Inverse filters are commonly used in communication [1], speech processing, audio and acoustic systems [2, 3], and instrumentation [4] to reverse the distortion of the signal incurred due to signal processing and transmission
Literature review on inverse filter suggests that numerous well-established [5] methods for digital inverse filter design do exist but analog inverse filter design remained unexplored area as is evident from the limited availability of analog inverse filter circuits/design methods [6,7,8,9,10,11,12,13,14] until recently
Single FTFN based inverse filters proposed in [9,10,11,12] present inverse filters using current feedback operational amplifier (CFOA)
Summary
Inverse filters are commonly used in communication [1], speech processing, audio and acoustic systems [2, 3], and instrumentation [4] to reverse the distortion of the signal incurred due to signal processing and transmission. The realization procedures for the current-mode FTFN-based inverse filters from the voltage-mode op-amp-based RC filters are presented in [7, 8]. Single FTFN based inverse filters proposed in [9,10,11,12] present inverse filters using current feedback operational amplifier (CFOA). All the circuits presented in [10, 11] provide single inverse filter function; [12] presents a topology which can realize inverse low-pass (ILP), inverse high-pass (IHP), and inverse band-pass (IBP) filter functions by appropriate admittance choice. The aim of this paper is to present a current differencing buffered amplifier (CDBA) based universal inverse filter topology which realizes all five inverse filter functions, namely, ILP, IHP, IBP, IBR and IAP by appropriate admittance selection
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