A fine frequency tuning for LC-DCO using enhanced capacitive degeneration technique

Saad, Sehmi; Hammadi, Aymen Ben; Besbes, Kamel

doi:10.1109/icemis.2017.8272988

Cited by 4 publications

(1 citation statement)

References 17 publications

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“…Several techniques such as the capacitive divider [1], the capacitive dithering [2] and the capacitive degeneration [3][4][5] have been suggested to minimize the unit step capacitance in LC oscillators. For example, a capacitive divider network that can be switched in parallel to the LCtank is used in [1] to obtain a reduction of the minimum effective capacitance.…”

Section: Introductionmentioning

confidence: 99%

A 270 Hz, Fine Frequency Tuning Class-C Oscillator Using Capacitive--Inductive Degeneration Technique in 130 -nm CMOS

Saad

Haddad

Hammadi

2021

2021 16th International Conference on Design &Amp; Technology of Integrated Systems in Nanoscale Era (DTIS)

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This paper presents a high-resolution Class-C type voltage-controlled oscillator (VCO) with a robust startup. The proposed oscillator achieves a minimum frequency quantification step of 270 Hz without adding any additional dithering approach. The very fine tuning is obtained through a capacitive-inductive degeneration coupling (CIDC) technique which reduces the capacitance value without appreciably affecting the intrinsic oscillator phase noise (PN). This technique also provides a negative transconductance to compensate for losses in the LC tank, resulting in high oscillation amplitude and relatively low power consumption in the oscillator core. The proposed design, implemented in 130 nm CMOS technology, achieves 45% tuning range. It exhibits a phase noise of -107 dBc/Hz @ 1-MHz offset, while it draws 5.75 mA from a supply of 1.2 V, resulting in a FoM of 165 dBc/Hz.

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