Design of low-voltage and low-power fully integrated filter based on log-domain current-mode integrator |
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Authors: | Shutao Li Yaonan Wang Jie Wu |
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Affiliation: | College of Electrical and Information Engineering, Hunan University, Changsha 410082 |
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Abstract: | In this paper a novel log-domain current-mode integrator based on MOS transistors in subthreshold is proposed. The integrator’s
time-constant is tunable by varying a reference bias current. By use of the integrator, a fifth-order Chebyshev lowpass filter
with 0.1dB ripples is designed. The simulation results demonstrate that the proposed filter has such advantages as low power
supply(1.5V), very low power dissipation (μW level), nearly ideal frequency response, very small sensitivity to components in passband, and adjustable cut-off frequency
over a wide range. The circuit is composed of NMOS transistors and grounded capacitors which make it suitable for fully integrated
circuit implementation. |
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Keywords: | Current mode Log-domain filter Low voltage |
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