A Blocker-Tolerant RF Front End With Harmonic-Rejecting $N$ -Path Filter

An RF front end with a harmonic-rejecting N -path filter is presented. It features tunable narrow-band filtering and high attenuation at the third- and fifth-order local oscillator (LO) harmonics at the LNA output, which improves the blocker tolerance at LO harmonics. The 0.2-1 GHz RF front end is implemented in a 65-nm CMOS process. The blocker 1-dB compression point (B1dB) is -2.4 dBm at a 20-MH...