Title :
Automatic tuning of MOSFET-C filters using digitally programmable current attenuators
Author :
Cunha, M.W.L. ; Filho, S. Noceti ; Schneider, M.C. ; Dalcastagnê, A.L.
Author_Institution :
Dept. de Engenharia Eletrica, Univ. Federal de Santa Catarina, Florianapolis, Brazil
Abstract :
A digital method for the automatic tuning of MOSFET-C filters is proposed. The method has been applied to an active-RC filter where resistors have been replaced by digitally programmable current dividers. The tuning approach uses the traditional master-slave technique and has been applied to a lowpass filter whose specified cutoff frequency is 78 kHz. The cutoff frequency of the slave filter has been kept around ±5% of its nominal value
Keywords :
CMOS analogue integrated circuits; RC circuits; attenuators; circuit tuning; continuous time filters; low-pass filters; programmable filters; 78 kHz; MOSFET-C filters; active filters; active-RC filter; automatic tuning; digital method; digitally programmable current attenuators; lowpass filter; master-slave technique; programmable current dividers; Attenuators; Band pass filters; Circuit optimization; Cutoff frequency; Digital control; Digital filters; MOSFET circuits; Master-slave; Resistors; Tuning;
Conference_Titel :
Circuits and Systems, 1997. ISCAS '97., Proceedings of 1997 IEEE International Symposium on
Print_ISBN :
0-7803-3583-X
DOI :
10.1109/ISCAS.1997.608728
