Title :
A tuning algorithm for digitally programmable continuous-time filters
Author :
Yu, Chong-Gun ; Bliss, William G. ; Geiger, Randall L.
Author_Institution :
Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA
Abstract :
This algorithm is based on estimates of filter characterization parameters based on the results of a system identification and subsequently calculated adjustments of the modeled controlling components. Simulations show this algorithm converges to a solution after iterations in the ideal case and attains good speed and accuracy even when parasitic effects are included in the system model. Simulations of the tuning of a sixth-order elliptic lowpass filter with 0.5-dB passband ripple designed to have a normalized cutoff frequency at 1 (rad/s) indicate that 0.501-dB passband ripple and 0.015% accuracy in the 3 dB band-edge can be achieved in the presence of typical parasitics
Keywords :
active filters; iterative methods; low-pass filters; tuning; accuracy; digitally programmable continuous-time filters; filter characterization parameters; iterations; normalized cutoff frequency; parasitic effects; passband ripple; sixth-order elliptic lowpass filter; speed; system identification; system model; tuning algorithm; Band pass filters; Circuit optimization; Digital filters; Frequency estimation; Master-slave; Passband; Switches; System identification; Transfer functions; Tuning;
Conference_Titel :
Circuits and Systems, 1991., IEEE International Sympoisum on
Print_ISBN :
0-7803-0050-5
DOI :
10.1109/ISCAS.1991.176643
