10 bit 2/5GHz dual band digitally-controlled LC-oscillator in 0.18 um CMOS Process

Author

Pokharel, Ramesh K. ; Uchida, Kenta ; Tomar, Abishek ; Kanaya, Haruichi ; Yoshida, Keiji

Author_Institution

Grad. Sch. of ISEE, Kyushu Univ., Fukuoka, Japan

fYear

2009

fDate

7-10 Dec. 2009

Firstpage

2284

Lastpage

2287

Abstract

This paper presents a design methodology and verification of a 2/5 GHz dual band digitally-controlled oscillator (DCO). The presented DCO employed two spiral inductors and a switching transistor between them to operate at two bands of frequency. The switch is controlled by a digital signal so that shifting from one band of frequency to another to control the operation of spiral inductors needs no analog voltage signal. The proposed circuit is implemented in 0.18 um CMOS technology and tested. The measured phase noise was -120.5 dBc/Hz and -113.9 dBc/Hz (both @ 1 MHz offset) at carrier frequency of 2.7 GHz and 4.1 GHz, respectively.

Keywords

CMOS integrated circuits; microwave oscillators; CMOS process; dualband digitally-controlled LC-oscillator; frequency 2 GHz; frequency 2.7 GHz; frequency 4.1 GHz; frequency 5 GHz; size 0.18 mum; spiral inductors; switching transistor; CMOS process; CMOS technology; Circuit testing; Design methodology; Dual band; Frequency; Inductors; Spirals; Switches; Voltage control; Digitally-controlled oscillator; dual band oscillator; frequency tuning step; phase noise;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference, 2009. APMC 2009. Asia Pacific

Conference_Location

Singapore

Print_ISBN

978-1-4244-2801-4

Electronic_ISBN

978-1-4244-2802-1

Type

conf

DOI

10.1109/APMC.2009.5385438

Filename

5385438