Continuous-Time 4th Order Butterworth Low-Pass Filter for Video Frequency Applications |
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Authors: | J Sabadell C Aldea S Celma P A Martínez |
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Affiliation: | (1) Grupo de Diseño Electrónico, Facultad de Ciencias at the, Universidad de Zaragoza, Zaragoza, Spain |
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Abstract: | In this paper, a continuous-time 4th order Butterworth low-pass filter based on current-mode processing is presented for applications over the video frequency range. A new type of integrator in which both voltage and currents may be integrated is presented and used as the main active block. The filter has been implemented using a very low-cost 2.4 m CMOS process (Mietec). The whole circuit occupies 2.8 mm2 and consumes 19 mW from a ±1.5 V supply. Experimental results are given for a 4.5 MHz to 12 MHz tunable low-pass filter with 58 dB of dynamic range at 10 MHz. |
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Keywords: | continuous-time 4th order Butterworth low-pass filter CMOS video frequency range |
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