In this paper, the design methodology of a fully integrated g/sub m/-C, 0.5-7 Hz band-pass amplifier is presented. The amplifier is designed to be employed in signal conditioning of a piezoelectric accelerometer, which is part of an implantable biomedical device. Transconductances of the OTAs range from 30 pS to 100 nS. Such low values of transconductances, which are required owing to the large time-constants involved, were obtained with the aid of a current division technique. Measurement results for OTA structures and part of the filter fabricated in a standard 0.8 /spl mu/m technology are presented.
['Alfredo Arnaud', 'Carlos Galup-Montoro']
A fully integrated 0.5-7 Hz CMOS bandpass amplifier