A blocker-tolerant RF front end with harmonic-rejecting N-path filtering

A 0.2-1 GHz RF front end with a harmonic-rejecting N-path filter (HR-NPF) features tunable narrow band filtering as well as high attenuation at the 3rd and 5th order LO harmonics at the LNA output. The B1dB-CP is -2.4dBm at a 20MHz offset, and remains high at the 3rd and 5th LO harmonics thanks to the HR-NPF configuration. The reverse isolation of the LNA helps to keep the LO emission below -90dBm. The two-stage harmonic rejection approach offers >51dB harmonic rejection ratio at the 3rd and 5th LO harmonics without calibration. The front end consumes 26-32mA while occupying an area of 0.77mm
²
.