Design of CMOS resonating push-push frequency doubler

Abstract

This paper concerns maximizing the conversion gain of a CMOS push-push doubler, in which the drains of a pair of differentially driven MOSFETs are tied together. We propose to insert transmission lines, which act as resonators at the fundamental frequency, between the drains of the MOSFETs. In the simulation of the proposed circuit, it achieved an output power improvement of 2.2 dB at the 0 dBm input power.