Ultra low power automatic tuning for gm-C filters
Germán Fierro, Andrés Rodríguez, Fabián Olivera, P. Aguirre, Fernando Silveira · Argentine School of Micro-Nanoelectronics, Technology and Applications · 2010
A simple technique for on-chip tuning of ultra low power Gm-C filters is analyzed in this paper. The technique locks the filter Gm/C2? frequency to an external reference clock. The proposed tuning method is tested with a low frequency first order high pass section. The tuning of this filter for different applications by changing the reference frequency is also explored. The circuit tunes the filter frequency in a range from 10 Hz to 200 Hz with a consumption of less than 800 nA.