Differential Passive N-path Filter Based on Switched Capacitors
A differential passive N-path filter based on switching capacitors is designed to address the issue that traditional N-path filters are unable to suppress harmonics and harmonic aliasing,and have certain insertion losses.This filter eliminates odd harmonics by using capacitance weighted multiphase signals with different capacitance values,suppresses harmonic aliasing by combining different clock signals,and uses capacitance stacking technology to provide certain gain and reduce insertion loss.The filter adopts TSMC 40 nm CMOS process,and the simulation results show that the center frequency fs of the filter can be adjusted from 0.3-1.5 GHz,and the rejection effect of fs=500 MHz is more than 48 dB for the 3rd and 5th harmonics,and the suppression of the most powerful harmonic folding reaches more than 60 dB,and there is no insertion loss,the noise figure(NF)is 2.5-2.8 dB,and the linearity(IIP3)is above 15 dBm.
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