Low-Power Gm-C Filter Employing Current-Reuse Differential Difference Amplifiers

This paper deals with the design of low-power, highperformance, continuous-time filters. The proposed OTA architecture employs current-reuse differential difference amplifiers in order to produce more power efficient Gm-C filter solutions. To demonstrate this, a 6th order low-pass Butterworth filter was designed in 0.18 μm CMOS achieving a 65-MHz -3-dB frequency, an in-band input-referred third-order intercept point of 12.0 dBm, and an input referred noise density of 40 nV/Hz, while only consuming 8.07 mW from a 1.8 V supply and occupying a total chip area of 0.21 mm with a power consumption of only 1.19 mW per pole.