CMOS VLSI Design: 8-Bit Digital Butterworth Filter

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Designed an 8-bit digital second order Butterworth filter on a 0.6 µm process for a 1.5 X 1.5 mm 40-pin MOSIS “TinyChip” package. Filter can be configured for either low pass or high pass behaviour using the input pins. The filter had the option of three cut-off frequencies. The cut-off frequencies were chosen such that a combination of shifters and adders could be used instead of multipliers for the gain components in order to fit the design within the size limit. This chip is currently being fabricated by MOSIS and will be tested in the fall.