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The proposed biquad realizes a second\u2010order transfer function with only one op\u2010amp, rendering even lower power consumption. By cascading two biquads, a 0.6\u2009V fourth\u2010order filter is realized in a 0.13\u00b5m CMOS technology. While dissipating only 0.42\u2009mW, the filter shows 2.11\u2009MHz cut\u2010off frequency and 62\u2009dB spurious\u2010free dynamic range. 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