Differential tuning oscillators with reduced flicker noise upconversion

Author

Levantino, S. ; Bonfanti, A. ; Romanò, L. ; Samori, C. ; Lacaita, A.L.

Author_Institution

Politecnico di Milano, Italy

fYear

2004

fDate

13-15 Dec. 2004

Firstpage

33

Lastpage

36

Abstract

The adoption of differential tuning in oscillators provides cancellation of common-mode disturbances, and thus, it is expected to lower phase noise and power supply pulling. However, the direct application of differential tuning increases the capacitor nonlinearity, and in turn, it can raise the flicker-induced phase noise. This upconversion mechanism, based on non-linearities, is quantitatively assessed and a modified configuration circumventing this phenomenon is proposed and applied to the design of a 1.8-GHz LC oscillator in 0.35-μm CMOS technology. The simulated 1/f³, phase noise is reduced by 20 dB, without impairing the tuning range and supply pulling.

Keywords

1/f noise; CMOS analogue integrated circuits; UHF oscillators; circuit tuning; flicker noise; phase noise; voltage-controlled oscillators; 0.35 micron; 1.8 GHz; 1/f³ phase noise; CMOS; LC oscillator; VCO; capacitor nonlinearity; common-mode disturbance cancellation; differential tuning oscillators; flicker-induced phase noise; nonlinearity based upconversion mechanism; power supply pulling; tuning range; upconversion flicker noise reduction; 1f noise; Circuit optimization; Frequency; Low-frequency noise; Phase noise; Power supplies; Tuning; Varactors; Voltage; Voltage-controlled oscillators;

fLanguage

English

Publisher

ieee

Conference_Titel

Electronics, Circuits and Systems, 2004. ICECS 2004. Proceedings of the 2004 11th IEEE International Conference on

Print_ISBN

0-7803-8715-5

Type

conf

DOI

10.1109/ICECS.2004.1399607

Filename

1399607