| 3 GHz低杂散锁相环中的低失配电荷泵 |
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| 引用本文： | 祝军,张吉利,王子谦,刁盛锡,林福江.3 GHz低杂散锁相环中的低失配电荷泵[J].微电子学,2016,46(4):480-483. |
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| 作者姓名： | 祝军 张吉利 王子谦 刁盛锡 林福江 |
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| 作者单位： | 中国科学技术大学 微纳电子系统集成研究中心,合肥 230026,中国科学技术大学 微纳电子系统集成研究中心,合肥 230026,中国科学技术大学 微纳电子系统集成研究中心,合肥 230026,中国科学技术大学 微纳电子系统集成研究中心,合肥 230026,中国科学技术大学 微纳电子系统集成研究中心,合肥 230026 |
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| 摘 要： | 基于SMIC 40 nm CMOS工艺,提出了一种改进型电荷泵电路。在传统电荷泵锁相环中,电荷泵存在较大的电流失配,导致锁相环产生参考杂散,使锁相环输出噪声性能恶化。设计的电荷泵电路在电流源处引入反馈,降低了电流失配。仿真结果表明,在供电电压为1.1 V,电荷泵充放电电流为0.1 mA,输出电压在0.3~0.7 V范围变化时,电荷泵的电流失配率小于0.83 %,锁相环的输出参考杂散为-65.5 dBc。
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| 关 键 词： | 电荷泵 锁相环 电流失配 CMOS集成电路 |
A Low Mismatch Charge Pump in 3 GHz Low Spur Phase-Locked Loop |
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| ZHU Jun,ZHANG Jili,WANG Ziqian,DIAO Shengxi and LIN Fujiang.A Low Mismatch Charge Pump in 3 GHz Low Spur Phase-Locked Loop[J].Microelectronics,2016,46(4):480-483. |
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| Authors: | ZHU Jun ZHANG Jili WANG Ziqian DIAO Shengxi and LIN Fujiang |
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| Affiliation: | Micro-Nano Electronic System Integration Center, University of Science and Technology of China, Hefei 230026, P. R. China,Micro-Nano Electronic System Integration Center, University of Science and Technology of China, Hefei 230026, P. R. China,Micro-Nano Electronic System Integration Center, University of Science and Technology of China, Hefei 230026, P. R. China,Micro-Nano Electronic System Integration Center, University of Science and Technology of China, Hefei 230026, P. R. China and Micro-Nano Electronic System Integration Center, University of Science and Technology of China, Hefei 230026, P. R. China |
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| Abstract: | An improved charge pump circuit was designed in SMIC 40 nm CMOS process. In conventional charge pump phase-locked loops(CPPLL), reference spur was generated due to the current mismatch of charge pump, and the output noise performance of PLL was decreased. In this design, a feedback circuit was added in current source to reduce the current mismatch. The results showed that the current mismatch of charge pump was less than 0.83%, the reference spurs was -65.5 dBc in the output voltage range of 0.3-0.7 V when the supply voltage was 1.1 V and the charge pump current was 0.1 mA. |
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