A Dual-Resonant Mode 10/22-GHz VCO With a Novel Inductive Switching Approach

Author

Liu, Szu-Ling ; Chen, Kuan-Han ; Chin, Albert

Author_Institution

Dept. of Electron. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan

Volume

60

Issue

7

fYear

2012

fDate

7/1/2012 12:00:00 AM

Firstpage

2165

Lastpage

2177

Abstract

This paper presents a novel dual-band voltage-controlled oscillator (VCO) in a standard 0.18-μm CMOS technology. With special design in the LC tank, the circuit exhibits two oscillation modes in different frequency bands. The frequency band selection is achieved by a switched coupled inductor with the tunable inductance and quality factor. This VCO can operate in a 10-GHz band with 7.6% tuning range and a 22-GHz band with 8% tuning range, while the core circuit draws a dc current of 8.44 mA from a 1.8-V supply voltage. The figures-of-merit at 10- and 22-GHz bands are - 184.63 and - 181.81 dBc/Hz, respectively. These performances are comparable with state-of-the-art dual-band LC-VCOs.

Keywords

CMOS integrated circuits; MMIC oscillators; Q-factor; inductors; voltage-controlled oscillators; CMOS technology; LC tank; current 8.44 mA; dual-band LC-VCO; dual-band voltage-controlled oscillator; dual-resonant mode VCO; figure-of-merit; frequency 10 GHz; frequency 22 GHz; frequency band selection; inductive switching approach; oscillation modes; quality factor; size 0.18 mum; switched coupled inductor; tunable inductance; voltage 1.8 V; Capacitance; Dual band; Inductors; Switches; Switching circuits; Voltage-controlled oscillators; Dual-band voltage-controlled oscillator (VCO); dual resonance; quality factor; self-resonance; switched LC-VCO;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/TMTT.2012.2195674

Filename

6203622