A Fully Integrated 027-THz Injection-Locked Frequency Synthesizer With Frequency

Abstract

A fully integrated sub-terahertz (sub-THz) frequency synthesizer is proposed cascading a radio frequency subsampling phase-locked loop (SS-PLL) with millimeter-wave injection-locked frequency multipliers (ILFMs) and a sub-THz mixer for frequency extension. Enhanced third-harmonic and fourth-harmonic-extraction techniques are proposed for the ILFMs with different multiplication ratios. In addition, a frequency-tracking loop (FTL) with automatic frequency and amplitude calibration is embedded for