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A 1-V, 6-nW programmable 4th-order bandpass filter for biomedical applications
Author(s)
Sundarasaradula, Yuwadee
Thanachayanont, Apinunt
Date Issued
October 1, 2016
Type
Article
Abstract
This paper describes the design and realization of a programmable 4th-order, Gm-C bandpass filter for biomedical applications. The core 2nd-order filter stage is realized by a simple gyrator-C active inductor structure with a single MOSFET as the transconductor element. The capacitive input attenuation technique is used to enhance the linearity of the filter. The proposed filter was designed and simulated with a 1-V power supply voltage with process parameters from a standard 0.18 µm CMOS technology. Post-layout simulation shows that the center frequency of the filter is adjustable from 80 Hz to 6.18 kHz by using a programmable bias current generator. At a nominal center frequency of 945 Hz and the quality factor of 3, the filter exhibits a dynamic range of 57.6 dB and an input-referred noise of 174.2 µV. The filter consumes only 6 nW from a 1-V single power supply voltage and the active area of the overall circuit is 0.088 mm2.
Citation
Analog Integrated Circuits and Signal Processing, 89(1), 89-98, 2016