A fractional-N frequency synthesizer with a wide-band small gain-Fluctuation VCO for mobile DTV applications

Author

Ahn, Tae-won ; Moon, Je-cheol ; Moon, Yong

Author_Institution

Dongyang Tech. Coll., Seoul

fYear

2007

fDate

22-25 Oct. 2007

Firstpage

303

Lastpage

306

Abstract

A fully integrated Sigma-Delta fractional-N frequency synthesizer featuring wide-band and small VCO-gain (K_VCO) fluctuation is presented. To cover wide-band frequency operation for mobile DTV applications, 6-bit switched-capacitor bank LC VCO is used, and for small K_VCO fluctuation, four self-controlled varactor blocks are added to conventional capacitor bank scheme. The integrated VCO tuning range is as wide as 890 MHz (65%) from 910 MHz to 1.8 GHz, which can cover all the desired frequencies for the DVB-H/ISDB-T/T-DMB receiver and achieves 52% smaller K_VCO fluctuation than that of a conventional design.

Keywords

capacitor storage; capacitor switching; digital television; frequency synthesizers; mobile television; voltage-controlled oscillators; fractional-n frequency synthesizer; gain-fluctuation VCO; mobile DTV; self-controlled varactor; switched-capacitor bank; wide-band frequency operation; Capacitors; Delta-sigma modulation; Digital TV; Digital video broadcasting; Fluctuations; Frequency synthesizers; Tuning; Varactors; Voltage-controlled oscillators; Wideband;

fLanguage

English

Publisher

ieee

Conference_Titel

ASIC, 2007. ASICON '07. 7th International Conference on

Conference_Location

Guilin

Print_ISBN

978-1-4244-1132-0

Electronic_ISBN

978-1-4244-1132-0

Type

conf

DOI

10.1109/ICASIC.2007.4415627

Filename

4415627