A 0.18-μm 10-GHz CMOS ring oscillator for optical transceivers

Author

Liu, Hai Qi ; Goh, Wang Ling ; Siek, Liter

Author_Institution

Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore, Singapore

fYear

2005

fDate

23-26 May 2005

Firstpage

1525

Abstract

This paper presents a three-stage 1.8-V 10-GHz ring oscillator, implemented using the 0.18-μm digital CMOS technology. The circuit utilizes the feedforward technique at the delay cells and positive feedback provided by a cross-coupled nMOS pair in each delay cell to boost the operation speed of the oscillator. The output frequency ranges from 10.1 to 8.4 GHz with control voltages of 0 to 1.5 V. The simulated result of the phase noise is -99.9 dBc/Hz at 1-MHz offset from the center frequency of 9.2 GHz. The circuit draws 35 mA and 22 mA from the 1.8-V supply when running at the highest and lowest frequencies, respectively.

Keywords

CMOS digital integrated circuits; feedforward; optical feedback; optical receivers; optical transmitters; oscillators; transceivers; 0 to 1.5 V; 0.18 micron; 1.8 V; 10.1 to 8.4 GHz; 22 mA; 35 mA; 9.2 GHz; CMOS ring oscillator; cross-coupled nMOS pair; delay cells; digital CMOS technology; feedforward; optical transceivers; positive feedback; three-stage ring oscillator; CMOS technology; Circuit simulation; Delay; Feedback circuits; Frequency; MOS devices; Optical feedback; Ring oscillators; Transceivers; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2005. ISCAS 2005. IEEE International Symposium on

Print_ISBN

0-7803-8834-8

Type

conf

DOI

10.1109/ISCAS.2005.1464890

Filename

1464890