A 4th-order 100 μA Diode-RC-based filter with 5 dBm-IIP3 at 24 MHz cut-off frequency

This paper presents a 4th-order low-pass continuous-time Diode-RC filter with 24 MHz cut-off frequency. The filter structure is based on the combination of positive (passive) and negative (using cross-coupled MOS transistors) cells to synthesize complex-conjugate-poles pairs. Moreover, the filter is designed and optimized to have high-linearity along all the filter pass-band. The filter exhibits 16 dBm-IIP 3 with 2–3 MHz input tones and 5 dBm-IIP 3 with 23–24 MHz, whereas the current consumption remains limited to 100μA from 1.8 V supply voltage