CMOS Quadrature VCOs Using the Varactor Coupling Technique

Author

Jang, Sheng-Lyang ; Shih, Chih-Chieh ; Liu, Cheng-Chen ; Chang, Chia-Wei ; Hsue, Ching-Wen

Author_Institution

Dept. of Electron. Eng., Nat. Taiwan Univ. of Sci. & Technol., Taipei, Taiwan

Volume

21

Issue

9

fYear

2011

Firstpage

498

Lastpage

500

Abstract

This letter presents a new quadrature voltage-controlled oscillator (QVCO), which consists of two complementary cross-coupled voltage-controlled oscillators (VCOs) coupled via varactors. The proposed CMOS QVCO has been implemented with the TSMC 0.18 μm CMOS technology and the die area is 0.61 × 0.95 mm². At the supply voltage of 1.2 V, the total power consumption is 3.7 mW. The free-running frequency of the QVCO is tunable from 3.86 GHz to 4.22 GHz as the tuning voltage is varied from 0.0 to 1.2 V. The measured phase noise at 1 MHz frequency offset is -123.42 dBc/Hz at the oscillation frequency of 3.94 GHz and the figure of merit (FOM) of the proposed QVCO is -190.38 dBc/Hz.

Keywords

CMOS integrated circuits; MMIC oscillators; field effect MMIC; phase noise; varactors; voltage-controlled oscillators; CMOS quadrature VCO; TSMC CMOS technology; complementary cross-coupled voltage-controlled oscillators; figure of merit; free-running frequency; frequency 3.86 GHz to 4.22 GHz; oscillation frequency; phase noise; power 3.7 mW; quadrature voltage-controlled oscillator; size 0.18 mum; varactor coupling technique; voltage 0 V to 1.2 V; CMOS integrated circuits; Couplings; Phase noise; Tuning; Varactors; Voltage-controlled oscillators; CMOS; quadrature voltage-controlled oscillator (QVCO); varactor coupling;

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2011.2162614

Filename

5982091