A low noise CMOS wideband PLL with a new AAC LC-VCO

Author

Wu, Xuan ; Sun, Wen ; Chen, Uotian ; Shi, Longxin

Author_Institution

National ASIC Syst. & Eng. Center, Nanjing

Volume

2

fYear

2005

fDate

24-0 Oct. 2005

Firstpage

539

Lastpage

543

Abstract

This paper presents a wideband CMOS PLL frequency synthesizer with a new AAC (auto-amplitude control) VCO in 0.35mum CMOS process. To get wideband VCO frequency output in relatively low RF band (400MHz~660MHz), an off-chip LC tank with a high voltage varactor is used. The new AAC module is designed to keep the output amplitude constant, hence relatively good performance. The proposed PLL is made up of two chips, one is the VCO and the other is the rest parts. The synthesizer is verified by simulation and measurement. The measured result shows that this PLL can work in a wide band and has low noise

Keywords

CMOS integrated circuits; VHF oscillators; frequency synthesizers; phase locked loops; phase noise; voltage-controlled oscillators; 0.35 micron; 400 to 660 MHz; AAC module; CMOS process; CMOS wideband PLL; auto-amplitude control VCO; frequency synthesizer; high voltage varactor; off-chip LC tank; phase locked loop; voltage controlled oscillator; CMOS process; Frequency synthesizers; Noise measurement; Phase locked loops; Radio frequency; Semiconductor device measurement; Varactors; Voltage; Voltage-controlled oscillators; Wideband;

fLanguage

English

Publisher

ieee

Conference_Titel

ASIC, 2005. ASICON 2005. 6th International Conference On

Conference_Location

Shanghai

Print_ISBN

0-7803-9210-8

Type

conf

DOI

10.1109/ICASIC.2005.1611389

Filename

1611389