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system-level-simulation
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Analysis of imperfections in N-phase high-Q band-pass filters
, Article IEEE International Symposium on Circuits and Systems, ISCAS 2015, 24 May 2015 through 27 May 2015 ; Volume 2015-July , May , 2015 , Pages 273-276 ; 02714310 (ISSN) ; 9781479983919 (ISBN) ; Kananian, S ; Behmanesh, B ; Atarodi, S. M ; Fotowat Ahmady, A ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2015
Abstract
The effect of clock skew and duty-cycle on the performance of high-Q N-phase band-pass filters (BPFs) have been examined in this paper. Following a mathematical approach and using the analytical derivations carried out, the effects of such non-idealities as clock skew and duty-cycle error are determined in an N-path filter. It is analytically proved that image signals from all integer multiples of the clock signal, rather than just those at (1 ± kN) multiples of the clock signal, land atop the wanted RF spectrum. In a real world clock generator, with non-idealities in effect, filtering property and proper behavior of the filter is adversely affected. Finally, system level simulation along...
Networked adaptive non-linear oscillators: A digital synthesis and application
, Article Circuits, Systems, and Signal Processing ; Vol. 34, Issue. 2 , 2014 , pp. 483-512 ; ISSN: 1531-5878 ; Ahmadi, A ; Makki, S. V. A. - D ; Soleimani, H ; Bavandpour, M ; Sharif University of Technology
Abstract
This paper presents a digital hardware implementation of a frequency adaptive Hopf oscillator along with investigation on systematic behavior when they are coupled in a population. The mathematical models of the oscillator are introduced and compared in sense of dynamical behavior by using system-level simulations based on which a piecewise-linear model is developed. It is shown that the model is capable to be implemented digitally with high efficiency. Behavior of the oscillators in different network structures to be used for dynamic Fourier analysis is studied and a structure with more precise operation which is also more efficient for FPGA-based implementation is implemented. Conceptual...
A new double input-double output complex envelope amplifier behavioral model taking into account source and load mismatch effects
, Article IEEE Transactions on Microwave Theory and Techniques ; Volume 63, Issue 2 , 2015 , Pages 766-774 ; 00189480 (ISSN) ; Banai, A ; Pedro, J. C ; Sharif University of Technology
Abstract
This paper presents a double input-double output bilateral low-pass equivalent amplifier behavioral model that takes into account input source and output load termination mismatches. The model is intended for the system-level simulation of amplifier chains subjected to wideband modulated signals, since it can predict the device's input and output scattered waves and their memory effects, in a wide range of voltage standing wave ratios (VSWR). In addition, the model extraction methodology, and its associated laboratory test bench are discussed, noting the limitations of conventional setups for behavioral model extraction and validation. The model is validated comparing the predicted and...