A Harmonic Shaping Low Power-consumption N-path Filter for RF Front End
To solve the problems of high power-consumption and unable to select or reject higher harmonics of signal based on the application requirements in traditional RF front-end N-path filter,a harmonic shaping,low power-consumption N-path filter is designed.The filter effectively shapes harmonics by adding extra paths with proper weighting.At the same time,by using the nth harmonic of Local Oscillator(LO)signal instead of the clock signal to reduce the frequency of the LO signal,the dynamic power consumption of the clock signal generator is reduced by a factor of n.The simulation results in SMIC 180 nm CMOS technology show that the band-pass filter has a center frequency adjustment from 0.1～6.0 GHz,a gain ranging from 0～5 dB,a noise figure lower than 4.6 dB,power consumption ranging from 3.5～6.0 mW,an Input 3rd-order Intermodulation Point(IIP3)greater than 10 dBm,and rejection for the 3th and 5th harmonics greater than 65,90 dB respectively,when N=10.It indicates that the filter has the functionality of harmonic rejection and shaping,along with low power-consumption.
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