A 0.6 V, 2.11 MHz, 62 dB SFDR active-RC filter in 0.13 μm CMOS process

摘要

Active-RC biquad is proposed, which allows the DC level of the input of operational amplifier (op-amp) to be different from that of the op-amp output, enabling the low-voltage operation. The proposed biquad realizes a second-order transfer function with only one op-amp, rendering even lower power consumption. By cascading two biquads, a 0.6 V fourth-order filter is realized in a 0.13 μm CMOS technology. While dissipating only 0.42 mW, the filter shows 2.11 MHz cut-off frequency and 62 dB spurious-free dynamic range.