A △∑ fractional-N frequency synthesizer for FM tuner using low noise filter and quantization noise suppression technique |
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引用本文: | 陈铭易,楚晓杰,于鹏,颜峻,石寅.A △∑ fractional-N frequency synthesizer for FM tuner using low noise filter and quantization noise suppression technique[J].半导体学报,2014,35(7):132-138. |
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作者姓名: | 陈铭易 楚晓杰 于鹏 颜峻 石寅 |
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作者单位: | Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China |
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摘 要: | A △∑ fractional-N frequency synthesizer fabricated in a 130 nm CMOS technology is presented for the application of an FM tuner. A low noise filter, occupying a small die area and decreasing the output noise, is integrated on a chip. A quantization noise suppression technique, using a reduced step size of the frequency divider, is also adopted. The proposed synthesizer needs no off-chip components and occupies an area of 0.7 mm2. The in-band phase noise (from 10 to 100 kHz) below -108 dBc/Hz and out-of-band phase noise of -122.9 dBc/Hz (at 1 MHz offset) are measured with a loop bandwidth of 200 kHz. The quantization noise suppression technique reduces the in-band and out-of band phase noise by 15 dB and 7 dB respectively. The integrated RMS phase error is no more than 0.48°. The proposed synthesizer consumes a total power of 7.4 mW and the frequency resolution is less than 1 Hz.
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关 键 词: | CMOS技术 频率合成器 FM调谐器 噪声滤波器 噪声抑制 量化 分数 相位噪声 |
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