C. Eswaran

Bio: C. Eswaran is an academic researcher from Multimedia University. The author has contributed to research in topics: Adaptive filter & Filter (signal processing). The author has an hindex of 1, co-authored 1 publications receiving 7 citations.

A new realization method for multidimensional GIC digital filters

Abstract: A simple and straightforward procedure for the realization of multidimensional digital filters which are based on the concept of generalized immittance converter is presented. It is known that these digital filters possess many salient features such as low noise, low sensitivity, absence of limit cycles and capability of realizing multiple transfer functions. Unlike the other known methods, which use analog transfer function as the basis, the method proposed in this paper uses the discrete transfer function directly for realization. It is shown that the required details of the resulting filter structure, namely, the organization of the different adaptors and the values of the multiplier constants can be obtained directly from the specified discrete transfer function.

Design of Two-Dimensional Pseudorotated Digital Filters Using Concept of Generalized Immittance Converter

Abstract: A new realization procedure based on the concept of the generalized immittance converter (GIC) is proposed for two-dimensional (2D) pseudorotated digital filters that have circularly symmetric magnitude response characteristics. By applying a suitable transformation to a one-dimensional stable discrete transfer function, the 2D discrete transfer function of the corresponding pseudorotated filter is obtained. This transfer function is then realized by using a direct computer-based method. It is shown that four types of GIC pseudorotated filter structures can be obtained by interconnecting a few specific types of digital modules. The modularity and regularity nature of these filters make them attractive for very large-scale integration implementation.

A 5th order Gm-C filter design with wide tuning transconductor

Abstract: This paper describes a wide tuning range transconductor combining source degeneration, cross-coupled, translinear loop to achieve linearity. The transconductance tuning range is from 220µs to 1050µs with 1V input range and the total harmonic distortion is −50 dB with 0.6 V pp input voltage. And its application to a fifth-order elliptic low-pass Gm-C filter for the front-end RF circuit is presented. In order to transform the passive element circuit into a Gm-C based filter, a GIC flow method has been used. The proposed Gm-C based filter achieves a performance with frequency filtering ranged from 5 MHz to 10 MHz by tuning the transconductance resided in the proposed filter.

Realization of modular multidimensional complex digital filters using GIC concept

Abstract: It is known that complex digital filters possess certain advantages over real digital filters in processing complex signals such as increased computational speed and efficiency. In this paper, a simple and systematic procedure which can be implemented through a computer program is presented for realizing a specific class of multidimensional (M-D) complex digital filters. The proposed filter structures are derived from analog reference configurations comprising generalized immittance converters and resistors by making use of wave concept. These filters possess many salient properties such as low noise, low sensitivity and capability of realizing multiple transfer functions simultaneously which are inherited from the reference analog filters they are derived from. These features make them attractive for very large-scale integrated (VLSI) implementation. It is shown that the proposed filter structures can be obtained directly from the specified M-D discrete transfer function without the need for realizing any analog reference configuration.

New Modular Multidimensional Digital Filter Structures

Abstract: New multidimensional digital structures that use the concept of a generalized immittance converter are presented in this paper. The proposed filter structures are regular and modular, and they realize multiple transfer functions simultaneously; hence, they are attractive for very large-scale integration implementation. It is shown that these filter structures can be obtained by using a few specific digital modules as building blocks. The arrangements of the modules and the values of the multiplier constants that are used in these modules can be obtained directly from the specified discrete transfer function by using a computer program.

Design of stable circularly symmetric two-dimensional GIC digital filters using PLSI polynomials

Abstract: A method for designing stable circularly symmetric two-dimensional digital filters is presented. Two-dimensional discrete transfer functions of the rotated filters are obtained from stable one-dimensional analog-filter transfer functions by performing rotation and then applying the double bilinear transformation. The resulting filters which may be unstable due to the presence of nonessential singularities of the second kind are stabilized by using planar least-square inverse polynomials. The stabilized rotated filters are then realized by using the concept of generalized immittance converter. The proposed method is simple and straight forward and it yields stable digital filter structures possessing many salient features such as low noise, low sensitivity, regularity, and modularity which are attractive for VLSI implementation.