A -90dBc@10kHz phase noise fractional-N frequency synthesizer with accurate loop bandwidth control circuit

Author

Morie, Takashi ; Dosho, Shiro ; Okamoto, Kouji ; Yamada, Yuji ; Sogawa, Kazuaki

Author_Institution

Corporate Dev. Div., Matsushita Electr. Ind. Co., Ltd, Osaka, Japan

fYear

2005

fDate

16-18 June 2005

Firstpage

52

Lastpage

55

Abstract

This paper describes a -90dBc@10kHz phase noise fractional-N frequency synthesizer of 110-180MHz output with accurate loop bandwidth control. Stable phase noise is achieved by controlling the bandwidth correctly, even if the PLL uses a noisy but small ring oscillator. Digital controller adjusts VCO gain and time constant of the loop filter. Analog controller compensates temperature variance. Test chip fabricated on 0.13μm CMOS process shows stable and good phase noise performance against process and environmental variations.

Keywords

CMOS integrated circuits; filters; frequency synthesizers; phase noise; system-on-chip; voltage-controlled oscillators; 0.13 micron; 10 kHz; 110 to 180 MHz; CMOS process; PLL; VCO gain; analog controller; control circuit; digital controller; fractional-N frequency synthesizer; loop bandwidth control; loop filter; phase noise; ring oscillator; temperature variance; time constant; Bandwidth; Circuit noise; Digital control; Digital filters; Frequency synthesizers; Phase locked loops; Phase noise; Ring oscillators; Voltage-controlled oscillators; Working environment noise;

fLanguage

English

Publisher

ieee

Conference_Titel

VLSI Circuits, 2005. Digest of Technical Papers. 2005 Symposium on

Print_ISBN

4-900784-01-X

Type

conf

DOI

10.1109/VLSIC.2005.1469332

Filename

1469332