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A fractional-N synthesizer for software-defined radio with reduced level of spurious tones

机译:分数N合成器,用于软件定义的无线电,具有降低的杂散音水平

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We present an integrated fractional-N frequency synthesizer providing in-phase / quadrature phase signal over the frequency bands 0.6–4.6 GHz, 5–7 GHz, 10–14 GHz, and in-phase signal over 20–28 GHz for software-defined radio applications. The use of two parallel charge pumps for VCO tuning results in a fairly constant in-band phase noise over a wide range. Phase noise in fractional mode is −100 dBc/Hz and −122 dBc/Hz at 10 kHz and 1 MHz offset, respectively, for an output frequency of 3.644 GHz. The near-integer spurs related to the substrate modulation by the VCO were reduced to below −60 dBc by shielding the reference input buffer. Fabricated in a 0.25 µm SiGe-BiCMOS process, the synthesizer draws 45 mA from a 5 V supply and 140 mA from a 3 V supply and occupies an area of 4.8 mm2.
机译:我们介绍了一个集成的分数-N频率合成器,在频带0.6-4.6 GHz,5-7 GHz,10-14 GHz和以20-28GHz的同相信号中提供相位/正交相位信号,以超过20-28GHz的软件定义无线电应用。用于VCO调谐的两个平行电荷泵会在宽范围内产生相当恒定的带内噪声。分数模式下的相位噪声为-100 dBc / hz和-122 dBc / hz,分别为10kHz和1 MHz偏移,输出频率为3.644 GHz。通过屏蔽参考输入缓冲器,与VCO的基板调制相关的近整数的马刺通过屏蔽参考输入缓冲器而减少到-60dBc以下。在0.25μm的SiGe-Bicmos工艺中制造,合成器从5V电源和3 V供应的140 mA绘制45mA,占地面积为4.8mm 2

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