An 8mW, 1GHz span, passive spectrum scanner with > +31dBm out-of-band IIP3

A 65nm CMOS, 8mW spectrum scanner using simple but linear periodically time-varying (LPTV) circuits is presented. The scanner spans a 1GHz spectrum by providing sharp filters at programmable centre frequencies. Its passive structure gives it a measured out-of-band IIP3 of > +31dBm and a sensitivity of < −142dBm/Hz across the 1GHz band leading to an SFDR of 75dB in a 1MHz resolution bandwidth.