A W-Band Signal Generation Using N-Push Frequency Multipliers for Low Phase Noise

A W-band frequency generation for FMCW radar application is presented. It cascades a ring based five-push multiplier and a push-push injection-locked oscillator for 10 times multiplication with a two stage power amplifier. The chip is fabricated in 65 nm CMOS technology and its size including ESD-protected pads is 860 μm×620 μm. Phase noise of the output signal is -110 dBc/Hz at 1 MHz offset using the 7.8 GHz reference frequency with the phase noise of -132 dBc/Hz at 1 MHz offset. The output power of the complete circuit is larger than 8.8 dBm for the entire output locking range, and N-push technique enables unwanted spur suppression larger than 59 dBc. The total power consumption is 265 mW.