Abstract
A stabilization technique is presented for harmonic oscillators which can reduce deviation of radio-frequency parameters against process variation. The stabilizing gate circuit (SGC) is designed to improve fidelity of oscillation amplitude, phase noise, and period jitter without a significant increase in power requirement. Process-related phenomena such as device aging, feature size uncertainty, and supply ripples are covered through modeling of threshold voltage, device dimension, and power rail variation. Single-ended and differential circuits of inductor-capacitor (LC)- tuned Hartley harmonic oscillators are simulated with 90-nm device parameters to verify the SGC’s effectiveness for diverse front ends. The technique is able to reduce variability of phase noise and period jitter by up to 34 dBc/Hz and 76 fs over a wide range of offset frequencies (10\(^3\)–10\(^6\) Hz). It also improves stability of oscillation amplitude by up to 29 % and performs better than other reported process compensation mechanisms.
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Roy, A., Rashid, A.B.M.H. A Stabilization Technique for Single-Ended and Differential Harmonic Oscillators. Circuits Syst Signal Process 34, 3409–3429 (2015). https://doi.org/10.1007/s00034-015-0017-5
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DOI: https://doi.org/10.1007/s00034-015-0017-5