A 0.71-pJ/b ON-OFF Keying $K$ -Band Oscillator Using an InP-Based Resonant Tunneling Diode

This letter presents the high-data rate performance of a 7-Gb/s resonant tunneling diode (RTD)-based on-off keying (OOK) oscillator core with a heterojunction bipolar transistor (HBT) switch design. It is found that the integrated HBT switch improves the data rate of the RTD OOK oscillator IC by minimizing the RC delay time in the previous direct driving oscillator design. The fabricated OOK oscillator IC shows an energy efficiency of 0.71-pJ/b which is the best value reported to date to the authors' knowledge in a related frequency range.