60 GHz Second Harmonic Power Amplifiers in 130-nm CMOS
Abstract—Two different frequency doubling power amplifiers have been measured, one with differential and one with single-ended input, both with single-ended output at 60 GHz. The amplifiers have been implemented in a 1p8M 130-nm CMOS process. The resonant nodes are tuned to 30 GHz or 60 GHz using on-chip transmission lines, which have been simulated in ADS and Momentum. The measured input impedan