21.5 dBm-IIP3 22.5 MHz fourth-order follow-the- Leader-feedback analogue filter

A 4th-order single-loop follow-the-leader-feedback (FLFB) low-pass continuous-time filter in CMOS 0.18 μm is hereby presented. The outstanding FLFB noise behaviour is exploited to allocate the power consumption to linearity performance. The low-pass filter prototype features 22.5 MHz-3 dB frequency, 21.5 dBm-IIP3 and 76 μVRMS input referred in-band integrated noise. The overall power consumption is 7 mA from a 1.8 V supply voltage. The signal-to-noise ratio for a -40 dB-total harmonic distortion is 69 dB.