Low-Phase Noise LC-tank Quadrature Voltage Controlled Oscillator

Author

Jeong, Chan-Young ; Lee, Mi-Young ; Yoo, Changsik

Author_Institution

Dept. of Electron. & Comput. Eng., Hanyang Univ., Seoul

fYear

2005

fDate

Nov. 2005

Firstpage

269

Lastpage

272

Abstract

A low phase noise LC-tank quadrature voltage controlled oscillator (QVCO) is described. Two differential pairs (one for negative g_m generation and the other one for the coupling input) of each resonator have separate bias current sources which are switched on and off by the coupling input of each resonator. The measured results of 5GHz quadrature VCOs (QVCO) implemented in a 0.13mum CMOS process shows the proposed biasing scheme can improve the phase noise by 17dB from the conventional QVCO with constant tail current sources while the two QVCOs consume the same power (4.4mA from a 1.2V supply). The smaller 1/f noise of the switched current source improves the phase noise by 7dB. The additional 10 dB improvement of the phase noise is obtained by employing the coupling input as the switching signal and separating the tail current sources for the two differential pairs of each resonator

Keywords

1/f noise; CMOS analogue integrated circuits; microwave oscillators; phase noise; resonators; voltage-controlled oscillators; 0.13 micron; 1.2 V; 4.4 mA; 5 GHz; CMOS process; LC-tank oscillator; low-phase noise VCO; quadrature voltage controlled oscillator; CMOS process; Current measurement; Energy consumption; Frequency conversion; MOSFETs; Noise measurement; Phase noise; Tail; Transceivers; Voltage-controlled oscillators;

fLanguage

English

Publisher

ieee

Conference_Titel

Asian Solid-State Circuits Conference, 2005

Conference_Location

Hsinchu

Print_ISBN

0-7803-9163-2

Electronic_ISBN

0-7803-9163-2

Type

conf

DOI

10.1109/ASSCC.2005.251717

Filename

4017583