A Fully Integrated Single-Ended 1.5-15-Hz Low-Pass Filter With Linear Tuning Law

A second-order, single-ended, fully integrated low- pass filter with cut-off frequency tunable in the range 1.5-15 Hz is presented. The filter is based on a recently proposed CMOS transconductor topology, combining G m values of the order of a few nS with large input ranges and suitability to single...

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Bibliographic Details
Published in:IEEE journal of solid-state circuits 2007-07, Vol.42 (7), p.1522-1528
Main Authors: Bruschi, P., Nizza, N., Pieri, F., Schipani, M., Cardisciani, D.
Format: Article
Language:English
Subjects:
Analog filter
Applied sciences
Circuit properties
Circuit testing
Circuit topology
Circuits
CMOS
CMOS process
Cutoff frequency
Design. Technologies. Operation analysis. Testing
Distortion
Distortion measurement
Dynamic range
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Exact sciences and technology
Frequency filters
Harmonic distortion
Integrated circuits
Law
low frequency
Low pass filters
Noise levels
Nonlinear filters
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
transconductor
Transconductors
Tunable circuits and devices
Tuning
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Summary:A second-order, single-ended, fully integrated low- pass filter with cut-off frequency tunable in the range 1.5-15 Hz is presented. The filter is based on a recently proposed CMOS transconductor topology, combining G m values of the order of a few nS with large input ranges and suitability to single-ended filter architectures. The circuit has been designed and fabricated using 3.3-V 0.35-mum CMOS devices from the STMicroelectronics Bipolar-CMOS-DMOS process BCD6. The tested prototype occupies an area of 960 x 350 mum 2 and requires a supply current ranging from 50 to 500 muLambda, depending on tuning. Total harmonic distortion lower than 1% has been measured in a wide tuning range for 1-V peak-to-peak input signal amplitude. The effect of temperature on the tuning law in the interval 0-80degC is shown. A dynamic range in excess of 60 dB over the whole tuning range has been estimated from distortion and noise measurements.
ISSN:0018-9200
1558-173X
DOI:10.1109/JSSC.2007.899081