A 4.4mW Inductorless 2–20GHz Single-Ended to Differential Frequency Doubler in 45nm RFSOI CMOS Technology

This work presents a miniature inductorless frequency doubler with high fundamental rejection, wide bandwidth, and single-ended to differential conversion. By utilizing an NMOS/PMOS pair with symmetrical loads attached to drain and source terminals, the second harmonic of an input signal is extracted. Fundamental rejection of up to 35 dB and a wide output range of 2 to 20 GHz is shown in measurement. The doubler is implemented in 45nm CMOS RFSOI technology and draws 4.4mW including biasing and buffer stages. The circuit consumes an active area excluding pads of only 50 × 70µm².