A Millimeter-Wave Ultra-Wideband Polyphase Frequency Doubler With 88% FBW and Inherent Harmonic Cancellation in 22nm FDSOI

This paper presents a 22-57 GHz frequency doubler that uses two push-push class-C active stages and a differential I-Q input signal to generate a differential output signal at twice the input frequency. A two-stage transformer-based input quadrature coupler generates the required quadrature signals. The symmetric, multi-stage design of the coupler improves the phase and amplitude imbalance, and en...