Design issues in CMOS differential LC oscillators

Author

Hajimiri, Ali ; Lee, Thomas H.

Author_Institution

California Inst. of Technol., Pasadena, CA, USA

Volume

34

Issue

5

fYear

1999

fDate

5/1/1999 12:00:00 AM

Firstpage

717

Lastpage

724

Abstract

An analysis of phase noise in differential cross-coupled inductance-capacitance (LC) oscillators is presented. The effect of tail current and tank power dissipation on the voltage amplitude is shown. Various noise sources in the complementary cross-coupled pair are identified, and their effect on phase noise is analyzed. The predictions are in good agreement with measurements over a large range of tail currents and supply voltages. A 1.8 GHz LC oscillator with a phase noise of -121 dBc/Hz at 600 kHz is demonstrated, dissipating 6 mW of power using on-chip spiral inductors

Keywords

CMOS analogue integrated circuits; UHF integrated circuits; UHF oscillators; circuit stability; integrated circuit design; integrated circuit noise; jitter; phase noise; voltage-controlled oscillators; 1.8 GHz; 6 mW; CMOS differential LC oscillators; complementary cross-coupled pair; cross-coupled LC oscillators; design issues; inductance-capacitance oscillators; noise sources; onchip spiral inductors; phase noise; tail current effect; tank power dissipation; voltage amplitude; Circuit noise; Circuit simulation; Current supplies; Frequency; Inductors; Phase noise; Spirals; Tail; Voltage; Voltage-controlled oscillators;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/4.760384

Filename

760384