A digitally controlled 2.4-GHz oscillator in 65-nm CMOS

Author

Xu, Liangge ; Lindfors, Saska

Author_Institution

Helsinki Univ. of Technol., Helsinki

fYear

2007

fDate

19-20 Nov. 2007

Firstpage

1

Lastpage

4

Abstract

This paper presents a 2.4-GHz digitally controlled oscillator (DCO). The circuit is designed using a 65-nm six-metal CMOS technology with an operating voltage of 1.2 V. The DCO comprises an LC oscillator core and the digital interface logic. It has a frequency range of about 200 MHz covering the 2.4-GHz ISM band, with around 5 MHz available for frequency modulation. Its frequency quantization step is approximately 20 kHz, with a digital SigmaDelta-modulator used to allow a 5-bit fractional digital control and provide an effective frequency resolution better than 1 kHz. Its free running oscillation phase noise is -125 dBc/Hz at 1 MHz frequency offset with 4.8 mA biasing current. The power consumption is adjustable from 1.8 mW to 12 mW.

Keywords

CMOS integrated circuits; frequency modulation; integrated circuit design; integrated circuit noise; oscillators; phase noise; quantisation (signal); signal resolution; CMOS technology; LC oscillator; circuit design; current 4.8 mA; digital interface logic; digital modulator; digitally controlled oscillator; frequency 1 MHz; frequency 2.4 GHz; frequency modulation; frequency quantization; frequency resolution; phase noise; power 1.8 mW to 12 mW; power consumption; size 65 nm; voltage 1.2 V; CMOS digital integrated circuits; CMOS logic circuits; CMOS technology; Digital control; Digital-controlled oscillators; Frequency modulation; Logic design; Phase noise; Quantization; Voltage-controlled oscillators;

fLanguage

English

Publisher

ieee

Conference_Titel

Norchip, 2007

Conference_Location

Aalborg

Print_ISBN

978-1-4244-1516-8

Electronic_ISBN

978-1-4244-1517-5

Type

conf

DOI

10.1109/NORCHP.2007.4481047

Filename

4481047