A 3-to-13 GHz Quasi-Elliptic Higher-Order N-path Filter

This work presents an on-chip <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$3^{rd}$</tex> -order elliptic bandpass N-path filter operating from 3–13 GHz. The filter utilizes the frequency translation of an <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$N$</tex>-path filter to upconvert the response of a passive LC-based elliptic lowpass filter to realize the higher-order bandpass filtering. The prototype was fabricated in 22nm FDSOI CMOS technology and measures 9.2 dB insertion loss with 3 dB bandwidth of 1.06 GHz at 10 GHz center frequency and a stopband rejection of -20 dB at a frequency offset of 0.89 GHz from the center frequency. The filter achieves a IPldB and IIP3 of -1.7 dBm, 9.5 dBm respectively at 10 GHz center frequency and consumes 25.2mW power at 0.9V supply voltage with an area of <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$8.6 \text{mm}^{2}$</tex>.