This brief presents a novel biquadratic cell (biquad) based on the flipped-source-follower (FSF) circuit. The main idea is to exploit the FSF circuit as a basic building block for a low-pass second-order filter, taking advantage of its well-known strengths, like low-output impedance, low-noise, large in-band linearity, and low power. Thanks to the very essential FSF circuit, the resulting biquad is a power-efficient broad bandwidth stage, with very low-noise performance. In order to validate the biquad design idea, extensive circuital simulation results will be presented. The filter design example synthesizes a third-order low-pass transfer function and consumes 2.3 mW from a single 1.8 $\text{V} {@} {V} _{\text{DD}} $ . Input noise spectral density is 7 nV/vHz. Linearity has been evaluated in terms of IIP3 (25 dBm) and THD (−40 dBc at 380 ${\text{mV}}_{\text {0-PEAK}} $ output voltage swing, resulting in 62-dB SNR). Hence, a very promising figure-of-merit (i.e., 165 $\text{J}^{{-1}}$ ) has been achieved.