Title :
A 975-to-1960MHz fast-locking fractional-N synthesizer with adaptive bandwidth control and 4/4.5 prescaler for digital TV tuners
Author :
Lei Lu ; Zhichao Gong ; Youchun Liao ; Hao Min ; Zhangwen Tang
Author_Institution :
Fudan Univ., Shanghai
Abstract :
This paper presents a wideband fractional-N synthesizer whose loop bandwidth is controlled adaptively. A fast automatic frequency-control (AFC) technique which selects the subband of the VCO is proposed to reduce the residual fractional error to 1/16 of the reference frequency fref. A new 4/4.5 prescaler is adopted to lower the quantization noise by reducing the quantization step size to 0.5.
Keywords :
UHF oscillators; automatic frequency control; circuit tuning; digital television; frequency synthesizers; prescalers; voltage-controlled oscillators; VCO subband; adaptive bandwidth control; automatic frequency-control technique; digital TV tuner; fast-locking fractional-N synthesizer; frequency 975 MHz to 1960 MHz; quantization noise; Adaptive control; Automatic control; Bandwidth; Digital TV; Frequency; Programmable control; Quantization; Synthesizers; Tuners; Wideband;
Conference_Titel :
Solid-State Circuits Conference - Digest of Technical Papers, 2009. ISSCC 2009. IEEE International
Conference_Location :
San Francisco, CA
Print_ISBN :
978-1-4244-3458-9
DOI :
10.1109/ISSCC.2009.4977475
