Transfer function

About: Transfer function is a research topic. Over the lifetime, 14362 publications have been published within this topic receiving 214983 citations. The topic is also known as: system function & network function.

Minimax design of adjustable-bandwidth linear-phase FIR filters

Abstract: This paper considers the design of digital linear-phase finite-length impulse response (FIR) filters that have adjustable bandwidth(s) whereas the phase response is fixed. For this purpose, a structure is employed in which the overall transfer function is a weighted linear combination of fixed subfilters and where the weights are directly determined by the bandwidth(s). Minimax design techniques are introduced which generate globally optimal overall filters in the minimax (Chebyshev) sense over a whole set of filter specifications. The paper also introduces a new structure for bandstop and bandpass filters with individually adjustable upper and lower band edges, and with a substantially lower arithmetic complexity compared to structures that make use of two separate adjustable-bandwidth low-pass and high-pass filters in cascade or in parallel. Design examples are included in the paper.

The SyMPVL algorithm and its applications to interconnect simulation

Abstract: This paper describes SyMPVL, an algorithm for the computation of multi-port transfer functions of RLC circuits. SyMPVL employs a J-symmetric Lanczos-type algorithm for multiple starting vectors to reduce the original circuit matrices to a pair of banded symmetric matrices. These matrices, which are typically much smaller than the circuit matrices, determine a reduced-order model of the original multi-port. The transfer function of the model represents a matrix-Pade approximation of the multi-port matrix transfer function. Numerical results for SyMPVL applied to interconnect simulation problems are reported.

A modified discrete control law for UPS applications

Abstract: This paper presents a model reference controller with a repetitive control action for uninterruptible power supply (UPS) applications. The model reference controller modifies the structure of the plant so that the closed-loop transfer function is equal to a chosen reference model transfer function, whereas the repetitive control action minimizes periodic distortions caused by unknown periodic disturbances. Design procedure and stability analysis of the control scheme are discussed. Simulation and experimental results for a single-phase PWM inverter (110 V/sub RMS/, 1 kVA) controlled by a low cost microcontroller are presented to verify the performance of the proposed control approach under different load conditions.

Control of Flexible Structures Governed by the Wave Equation Using Infinite Dimensional Transfer Functions

Abstract: A method of noncollocated controller design for flexible structures, governed by the wave equation, is proposed. First an exact, infinite dimension, transfer function is derived and its properties are investigated. A key element in that part is the existence of time delays due to the wave motion. The controller design consists of two stages. The first one is an inner collocated rate loop. It is shown that there exists a controller that leads to a finite dimensional plus delay inner closed loop, which is the equivalent plant for the outer loop. In the second stage an outer noncollocated position loop is closed. It has the structure of an observer-predictor control scheme to compensate for the response delay. The resulting overall transfer function is second order with arbitrarily assigned dynamics, plus delay.

Method and system for digital equalization of non-linear distortion

Abstract: A method is provided for equalization of nonlinear distortion in a distorted signal comprising the steps of: digitizing the distorted signal and passing the digitized distorted signal through an inverse non-linear transfer function to equalize the nonlinear distortion. Other systems and methods are disclosed.