We present a study of tail-bias-current 1/ƒ noise upconversion into 1/ƒ3 phase noise for both Colpitts and differential-pair LC oscillators. We focus on the Groszkowski effect, i.e. the shift in oscillation frequency induced by the higher current harmonics flowing into the LC tank of a harmonic oscillator. Quantitative results match very well numerical simulations run with spectreRF, and show that the Groszkowski effect may indeed be a dominant cause of 1/ƒ3 phase noise generation.
On the Bias Noise to Phase Noise Conversion in Harmonic Oscillators Using Groszkowski Theory
BEVILACQUA, ANDREA;
2011
Abstract
We present a study of tail-bias-current 1/ƒ noise upconversion into 1/ƒ3 phase noise for both Colpitts and differential-pair LC oscillators. We focus on the Groszkowski effect, i.e. the shift in oscillation frequency induced by the higher current harmonics flowing into the LC tank of a harmonic oscillator. Quantitative results match very well numerical simulations run with spectreRF, and show that the Groszkowski effect may indeed be a dominant cause of 1/ƒ3 phase noise generation.
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