Fourth order filter structures using Operational Trans-resistance Amplifiers

2011 ◽  
Author(s):  
Nabil I. Khachab ◽  
Sara M. Naeim
Keyword(s):  
Fourth Order ◽  
Order Filter ◽  
Filter Structures

A Low Power Low-Pass Fourth-Order Filter for WiMAX/LTE Receiver in CMOS 45nm Technology

2016 ◽  
Vol 26 (03) ◽  
pp. 1750048 ◽  
Author(s):  
Vida Orduee Niar ◽  
Gholamreza Zare Fatin
Keyword(s):  
Low Power ◽  
Fourth Order ◽  
Supply Voltage ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Power Filter ◽  
Order Filter ◽  
Source Follower ◽  
Low Pass ◽  
Circuit Technique

In this paper, a [Formula: see text]-[Formula: see text] low-pass and low power filter with tunable in-band attenuation for WiMAX/LTE receiver is presented. The fourth-order filter consists of two cascaded biquad stages. The source-follower (SF) stage is used as a key building block in these biquads. In this paper, we have presented a circuit technique to reduce the nonlinearity of the SF stage resulting from unmatched signal swings at the gate and source terminals of the input transistor. The proposed SF stage, is used for design of a linear biquad which is then utilized in a fourth-order Butterworth low-pass filter. The simulation results of the filter for bandwidth of 10 MHz show that the IIP3 of the filter is equal to 8.22[Formula: see text]dBm, in-band noise density is 100[Formula: see text]nV/[Formula: see text]Hz and power consumption is 5.9[Formula: see text]mW. The supply voltage of the filter is equal to 1[Formula: see text]V.

A 28.8-MHz 23-dBm-IIP3 3.2-mW Sallen-Key Fourth-Order Filter With Out-of-Band Zeros Cancellation

2016 ◽  
Vol 63 (12) ◽  
pp. 1116-1120 ◽  
Author(s):  
Marcello De Matteis ◽  
Federica Resta ◽  
Alessandra Pipino ◽  
Stefano D'Amico ◽  
Andrea Baschirotto
Keyword(s):  
Fourth Order ◽  
Order Filter

Compact dual-mode rectangular waveguide filters using square ridge resonators

2009 ◽  
Vol 1 (4) ◽  
pp. 241-247 ◽  
Author(s):  
Simone Bastioli ◽  
Luca Marcaccioli ◽  
Roberto Sorrentino
Keyword(s):  
Fourth Order ◽  
Rectangular Waveguide ◽  
Dual Band ◽  
Pass Band ◽  
Dual Mode ◽  
New Class ◽  
Band Filter ◽  
Waveguide Filters ◽  
Band Pass ◽  
Filter Structures

A new class of compact rectangular waveguide filters is proposed in this paper. The key element is a square ridge resonator realized within a rectangular waveguide supporting the fundamental TE10 mode. The square ridge can support two modes resonating along orthogonal directions in the gap between the ridge and the opposite waveguide wall. This structure enables dual-mode degeneracy without the need of oversized cavities, thus allowing for considerable size reduction with respect to the conventional dual-mode implementations. Different filter structures employing one or more ridges within short waveguide sections are proposed as attractive solutions for pseudo-elliptic band-pass or dual-band filters. The experimental results of a manufactured fourth-order pseudo-elliptic pass-band filter validate the feasibility of the proposed class of filters.

scholarly journals Image Restoration Combining the Second-Order and Fourth-Order PDEs

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Tianhua Liu ◽  
Zhaoyin Xiang
Keyword(s):  
Partial Differential Equations ◽  
Differential Equations ◽  
Image Restoration ◽  
Fourth Order ◽  
Noise Removal ◽  
Second Order ◽  
Experimental Results ◽  
Combined Method ◽  
Order Filter ◽  
Removal Technique

A noise removal technique using partial differential equations (PDEs) is proposed. It combines a second-order filter with a fourth-order filter. The combined method takes the advantage of both filters since it can preserve edges and at the same time avoid the blocky effects in smooth regions. The experimental results illustrate the effectiveness of the model in image restoration.

scholarly journals A Combination of the Total Variation Filter and a Fourth-Order Filter for Image Registration

2015 ◽  
Vol 2015 ◽  
pp. 1-16 ◽  
Author(s):  
Xiaomei Yang ◽  
Chaomin Shen ◽  
Fang Li ◽  
Chunli Shen
Keyword(s):  
Image Registration ◽  
Total Variation ◽  
Fourth Order ◽  
Dual Algorithm ◽  
Split Bregman ◽  
Nonrigid Image Registration ◽  
Piecewise Constant ◽  
Order Filter ◽  
Deformation Problem ◽  
Smooth Component

We introduce a novel method for nonrigid image registration which combines the total variation filter and a fourth-order filter. We decompose the deformation field into two components, that is, a piecewise constant component and a smooth component. The total variation filter is used for the first component and the fourth-order filter is used for the second one. Then, we present a new PDE-based image registration model suitable for both smooth and nonsmooth deformation problem. Meanwhile, the local-global similarity measure is used in our method to improve the accuracy and robustness for image matching. By applying the split Bregman algorithm and dual algorithm, we present a fast and stable numerical scheme. The numerical experiments and comparisons on both synthetic images and real images demonstrate the effectiveness of our method in nonrigid image registration.

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