Design of 140-GHz Frequency Single-Ended and Push-Push Doublers with 31.61dB and 91.19dB Fundamental Suppression

This paper presents the design of single-ended and push-push frequency doublers at 140 GHz. Both designs use two open quarter-wavelength fundamental frequency transmission lines at output port to provide high fundamental suppression. Compared to single-ended topology, the push-push one achieves higher fundamental suppression. The single-ended and push-push doublers show simulated fundamental suppression of 31.61 dB and 91.19 dB respectively with output power of -3.02dBm and -2.03dBm at 5dBm input power. The doublers are implemented in 100-nm GaAs technology.