Title :
A 290 nW, weak inversion, Gm-C biquad
Author :
Rodriguez-Villegas, Esther ; Payne, A.J. ; Toumazou, Christofer
Author_Institution :
Instituto de Microelectron. de Sevilla, Seville, Spain
Abstract :
In this paper, a CMOS implementation of a low voltage micropower Gm-C biquad is presented. The filter is suitable for any kind of application involving low frequency ranges, and requiring very low power consumption, such as biomedical products. The Operational Transconductance Amplifier (OTA) is implemented with the devices working in the weak inversion saturation region, allowing the use of very small currents for low power purposes with reasonable aspect ratios which do not degrade the frequency response. The filter operates at a supply voltage lower than 1.75 V. Its cut-off frequency is tunable over two decades, and it exhibits a dynamic range higher than 54 dB, occupying an area of 0.06 mm2 without the integrating capacitances.
Keywords :
CMOS analogue integrated circuits; band-pass filters; biquadratic filters; circuit feedback; low-power electronics; operational amplifiers; 1.75 V; 290 nW; CMOS implementation; OTA; active filters; biomedical products; biquad filter; common mode control circuit; low frequency ranges; low voltage biquad; micropower Gm-C biquad; operational transconductance amplifier; second order bandpass filter; very low power consumption; weak inversion saturation region; Capacitance; Cutoff frequency; Degradation; Dynamic range; Energy consumption; Filters; Frequency response; Low voltage; Operational amplifiers; Transconductance;
Conference_Titel :
Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on
Conference_Location :
Phoenix-Scottsdale, AZ
Print_ISBN :
0-7803-7448-7
DOI :
10.1109/ISCAS.2002.1010964
