A 3∼5-GHz low-phase-noise fractional-N frequency synthesizer with AFC for GSM/PCS/DCS/WCDMA tranceivers

Author

Pan, Yaohua ; Huang, Yumei ; Hong, Zhiliang

Author_Institution

State Key Lab. of ASIC & Syst., Fudan Univ., Shanghai, China

fYear

2011

fDate

Nov. 30 2011-Dec. 2 2011

Firstpage

53

Lastpage

56

Abstract

A low-phase-noise Σ-Δ fractional-N frequency synthesizer for GSM/PCS/DCS/WCDMA transceivers is presented. The voltage controlled oscillator (VCO) is designed with modified digital controlled capacitor array (DCCA) to extend tuning range and minimize phase noise. A high-resolution adaptive frequency calibration (AFC) technique is proposed to choose frequency bands automatically in short time and increase phase noise immunity. A prototype is implemented in 0.13 μm CMOS technology. Experimental results show that the designed 1.2V wideband frequency synthesizer is locked from 3.05GHz to 5.17GHz within 30μs (20ppm), including 8μs AFC time. The measured in-band phase noise is -95.5 and -101dBc/Hz for 1.955GHz and 948MHz carriers, respectively, and accordingly the out-of-band phase noise is -123, -132dBc/Hz at 1MHz offset, and the reference spur is less than -69dBc.

Keywords

CMOS integrated circuits; cellular radio; frequency multipliers; frequency synthesizers; phase noise; voltage-controlled oscillators; AFC technique; CMOS technology; DCCA; DCS tranceivers; GSM tranceivers; PCS tranceivers; VCO; WCDMA tranceivers; digital controlled capacitor array; frequency 1.955 GHz; frequency 3 GHz to 5.17 GHz; frequency 948 MHz; high-resolution adaptive frequency calibration; in-band phase noise; low-phase-noise Σ-Δ fractional-N frequency synthesizer; low-phase-noise fractional-N frequency synthesizer; out-of-band phase noise; phase noise immunity; phase noise minimization; size 0.13 mum; time 8 mus; voltage controlled oscillator; wideband frequency synthesizer; Frequency control; Frequency synthesizers; GSM; Multiaccess communication; Phase noise; Spread spectrum communication; Voltage-controlled oscillators; AFC; DCCA; Phase-locked loop (PLL); VCO; loop stability analysis; phase noise;

fLanguage

English

Publisher

ieee

Conference_Titel

Radio-Frequency Integration Technology (RFIT), 2011 IEEE International Symposium on

Conference_Location

Beijing

Print_ISBN

978-1-4577-0517-5

Type

conf

DOI

10.1109/RFIT.2011.6141801

Filename

6141801