Title :
A Wideband 0.18-μm CMOS ΔΣ Fractional-N Frequency Synthesizer with a single VCO for DVB-T
Author :
Sung, Eun-yung ; Lee, Kun-Seok ; Baek, Dong-hyun ; Kim, Young-jin ; Park, Byeong-Ha
Author_Institution :
Syst.-LSI Div., Samsung Electron., Yongin
Abstract :
This paper describes the design of the DeltaSigma fractional-N frequency synthesizer for digital video broadcasting-terrestrial (DVB-T) receiver, which is fabricated in a 0.18-mum CMOS technology. A 3-bit 4th order sigma-delta (DeltaSigma ) modulator is employed for the fractional value implementation. A single on-chip voltage-controlled oscillator (VCO) covers a wideband frequency range- 900MHz to 1730MHz (63.1%) and provides the local oscillator (LO) signal - 470MHz to 862MHz via divider-2. The frequency synthesizer supports the whole channels and keeps the loop stable in operating and the performance variation is minimized over the wide frequency band. The variation of channel-to-channel switching time is also reduced. The measurement results show in-band phase noise is less than -80 dBc/Hz and out-of-band phase noise at 1.25 MHz offset is less than -128 dBc/Hz over all frequency range. The total lock time is less than 300 mus. The implemented frequency synthesizer consumes 10mA from 2.8-V power-supply
Keywords :
CMOS integrated circuits; UHF oscillators; delta-sigma modulation; digital video broadcasting; frequency synthesizers; radio receivers; voltage-controlled oscillators; 0.18 micron; 10 mA; 2.8 V; 470 to 862 MHz; 900 to 1730 MHz; CMOS technology; DeltaSigma fractional-N frequency synthesizer; channel-to-channel switching time; digital video broadcasting-terrestrial receiver; phase noise; sigma-delta modulator; single on-chip voltage-controlled oscillator; Broadcast technology; CMOS technology; Delta modulation; Delta-sigma modulation; Digital video broadcasting; Frequency conversion; Frequency synthesizers; Phase noise; Voltage-controlled oscillators; Wideband;
Conference_Titel :
Asian Solid-State Circuits Conference, 2005
Conference_Location :
Hsinchu
Print_ISBN :
0-7803-9162-4
Electronic_ISBN :
0-7803-9163-2
DOI :
10.1109/ASSCC.2005.251698