A <i>Ku</i>-Band Voltage-Controlled Oscillator Equipped With a Compact Enhanced Linearity Tuning Converter

Kuo, Yue-Fang; Wu, Ya-Pei; Liu, Yicheng

doi:10.1109/lmwc.2020.3036127

Cited by 4 publications

(1 citation statement)

References 7 publications

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“…It could be argued that the most recent researches in LC oscillators are derived from an innovative change in differential Colpitts and cross-coupled oscillators. [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] A precise study of PN in these oscillators was conducted in Andreani et al 29 and according to Hajimiri's method. The results show that the cross-coupled oscillator has better PN than the other one.…”

Section: Standardmentioning

confidence: 99%

Phase noise suppression in LC oscillators: Tutorial

Bagheri

2021

Circuit Theory & Apps

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This paper presents a comprehensive study of phase noise (PN) suppression in LC-tank oscillators. The goal of this study is to provide designers with the latest techniques for reducing PN in cross-coupled oscillators. To this end, we begin with a discussion of two prevalent PN models in oscillators: Hajimiri and Demir. We prefer the Hajimiri model because it does not involve very complicated math, and it offers engineers better insight into designing low-PN oscillators in the two-PN close-in regions in an oscillator spectrum (1/f 2 and 1/f 3 ). In 1/f 2 region, we show that a need for a large output-voltage swing leads to Class D and B oscillators, and a large output-current swing results in Class C oscillators. Also, reduction of the impulse sensitivity functions (ISFs) of an oscillator core can happen in Class F oscillators. A few solutions are presented for mitigating flicker noise up-conversion, such as adding resistances, controlling the oscillation amplitude, decreasing the conduction angle, guiding the high-frequency harmonics of current, and shifting the phase of V GS against V DS . We also provide a comparison of recent state-of-the-art literature to show what constitutes a good PN in both 1/f 2 and 1/f 3 regions in cross-coupled oscillators. We conclude that a cross-coupled oscillator can reach the best performances in 1/f 3 and 1/f 2 PN regions if the oscillator is designed in Class C with the K block and uses the techniques of narrowing the conduction angle, the tail inductor, and the modified tank simultaneously.

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