Breaking the Phase-Noise Barrier with Multi-Core and Series-Resonance Harmonic Oscillators in BiCMOS Technology
Sprache des Titels:
The talk begins with a review of the fundamental and technological limiting factors to the spectral purity of integrated RF oscillators, and then proposes circuit solutions to break the phase noise barrier in silicon technology. Phase noise can be scaled by resorting to the multi-core approach, provided mismatches among multiple oscillators are carefully considered. As an example, a 16-core (voltage-controlled) oscillator demonstrates -130dBc/Hz at 1MHz offset from 20 GHz minimum phase. A more elegant and efficient approach is then introduced. Leveraging the series resonance of a tank, the remarkably lower resistance rises considerably the tank active power, thus enabling a remarkable improvement on the spectral purity. Two 10GHz BiCMOS VCOs exploiting the concept are proposed. The measured minimum phase noise is ?138 dBc/Hz at 1-MHz offset with 600mW from 1.2-V supply. Experimental results demonstrate the lowest phase noise ever reported by fully integrated RF oscillators in a silicon technology.