A Sub-THz Frequency Doubler with Quadrature Outputs in 40-nm CMOS

A sub-THz frequency doubler with quadrature outputs is demonstrated in a 40-nm CMOS technology. The proposed scheme facilitates a local frequency generator operating near the maximum oscillation frequency of the technology. An impedance transformation network provides high impedance at the 2nd harmonic frequency, rejects the desired signal from feeding back and enhances the fundamental ...