Title :
Fast State-Space Harmonic-Distortion Estimation in Weakly Nonlinear Gm−C Filters
Author :
Sotiriadis, Paul P. ; Çelik, Abdullah ; Loizos, Dimitrios ; Zhang, Zhaonian
Author_Institution :
Dept. of Electr. Eng., Johns Hopkins Univ., Baltimore, MD
Abstract :
A fast, one-pass harmonic-distortion estimation algorithm for G m-C filters is introduced. It is derived using state-space modeling and can be applied directly to Gm-C filters, of any order, with MOS transconductors exhibiting any type of weak nonlinearity. The algorithm is formed out of a small number of explicit expressions involving the filter´s structural matrices and the transconductors´ nonlinearity. It can be easily implemented in MATLAB. For verification of the theoretical development, the algorithm was used to derive the harmonic distortion of a single-ended Gm-C filter with weakly nonlinear transconductors designed on a 0.5-mum technology. The results of the algorithm and CADENCE simulation were found to be in good agreement
Keywords :
harmonic distortion; nonlinear filters; state-space methods; 0.5 micron; MOS transconductors; continuous-time filter; fast state-space harmonic-distortion estimation; state-space modeling; weakly nonlinear Gm-C filters; Dynamic range; Frequency; Harmonic distortion; Impedance; MATLAB; Mathematical model; Nonlinear filters; Power harmonic filters; State estimation; Transconductors; Continuous-time filter; distortion; fast algorithm; filter; harmonic distortion; nonlinearity; perturbation; state space;
Journal_Title :
Circuits and Systems I: Regular Papers, IEEE Transactions on
DOI :
10.1109/TCSI.2006.887458
