A 220–1100 MHz low phase-noise frequency synthesizer with wide-band VCO and selectable I/Q divider

This paper presents a low phase-noise fractional-N frequency synthesizer which provides an inphase/quadrature-phase（I/Q） signal over a frequency range of 220–1100 MHz for wireless networks of industrial automation（WIA） applications. Two techniques are proposed to achieve the wide range. First, a 1.4...

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Published inJournal of semiconductors Vol. 35; no. 12; pp. 83 - 93
Main Author 陈华 龚任杰 程序 张玉琳 高众 郭桂良 阎跃鹏
Format Journal Article
LanguageEnglish
Published 01.12.2014
Subjects
CMOS工艺
Dividers
Frequency synthesizers
Noise
Offsets
Semiconductors
Synthesizers
Tuning
VCO
Voltage controlled oscillators
低相位噪声
宽带
工业自动化
预分频器
频率合成器
频率检测器
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Summary:This paper presents a low phase-noise fractional-N frequency synthesizer which provides an inphase/quadrature-phase（I/Q） signal over a frequency range of 220–1100 MHz for wireless networks of industrial automation（WIA） applications. Two techniques are proposed to achieve the wide range. First, a 1.4–2.2 GHz ultralow gain voltage-controlled oscillator（VCO） is adopted by using 128 tuning curves. Second, a selectable I/Q divider is employed to divide the VCO frequency by 2 or 3 or 4 or 6. Besides, a phase-switching prescaler is proposed to lower PLL phase noise, a self-calibrated charge pump is used to suppress spur, and a detect-boosting phase frequency detector is adopted to shorten settling time. With a 200 k Hz loop bandwidth, lowest measured phase noise is 106 dBc/Hz at a 10 k Hz offset and 131 dBc/Hz at a 1 MHz offset. Fabricated in the TSMC 0.18 μm CMOS process, the synthesizer occupies a chip area of 1.2 mm^2, consumes only 15 m W from the 1.8 V power supply,and settles within 13.2 s. The synthesizer is optimized for the WIA applications, but can also be used for other short-range wireless communications, such as 433, 868, 916 MHz ISM band applications.
Bibliography:This paper presents a low phase-noise fractional-N frequency synthesizer which provides an inphase/quadrature-phase（I/Q） signal over a frequency range of 220–1100 MHz for wireless networks of industrial automation（WIA） applications. Two techniques are proposed to achieve the wide range. First, a 1.4–2.2 GHz ultralow gain voltage-controlled oscillator（VCO） is adopted by using 128 tuning curves. Second, a selectable I/Q divider is employed to divide the VCO frequency by 2 or 3 or 4 or 6. Besides, a phase-switching prescaler is proposed to lower PLL phase noise, a self-calibrated charge pump is used to suppress spur, and a detect-boosting phase frequency detector is adopted to shorten settling time. With a 200 k Hz loop bandwidth, lowest measured phase noise is 106 dBc/Hz at a 10 k Hz offset and 131 dBc/Hz at a 1 MHz offset. Fabricated in the TSMC 0.18 μm CMOS process, the synthesizer occupies a chip area of 1.2 mm^2, consumes only 15 m W from the 1.8 V power supply,and settles within 13.2 s. The synthesizer is optimized for the WIA applications, but can also be used for other short-range wireless communications, such as 433, 868, 916 MHz ISM band applications.
Chen Hua，Gong Renjie，Cheng Xu，Zhang Yulin，Gao Zhong，Guo Guiliang，Yan Yuepeng，Institute of Microelectronics,Chinese Academy of Sciences，School of Electronics and Information Engineering,Harbin Institute of Technology
LC voltage-controlled oscillator（VCO）; I/Q divider; phase-switching prescaler; charge pump; phase-locked loop（PLL）; low phase noise; wide band; frequency synthesizer
11-5781/TN
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1674-4926
DOI:10.1088/1674-4926/35/12/125006