A 270-to-300 GHz Sub-Harmonic Injection Locked Oscillator for Frequency Synthesis in Sub-mmW Systems

This letter describes a sub-mmW oscillator with more than 10% tuning range oscillation frequency. In particular, the circuit includes a high sensitivity sub-harmonic injection technique that forces the 270-to-300 GHz output signal to multiply by 6 a 45-to-50 GHz injection signal. Thus, the output spectral and phase noise properties depend only on the injected lower frequency signal. The circuit is fabricated in a BiCMOS 55 nm technology and it is measured using probes. It achieves a 30 GHz tuning range and locks all over it. The measured phase noise is-105 dBc/Hz at 1 MHz offset at 297 GHz and the power consumption is 52 mW.