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JP2005318122A Charge pump circuit and pll circuit using the same 有权
标题翻译：充电泵电路和使用相同的PLL电路
公开(公告)号：JP2005318122A
公开(公告)日：2005-11-10
申请号：JP2004132017
申请日：2004-04-27
申请人： Nippon Precision Circuits Inc , 日本プレシジョン・サーキッツ株式会社
发明人： KAWAI HIROSHI , OTSUKA HARUHIKO
IPC分类号： H03K17/06 , H03K19/0175 , H03L7/089 , H03L7/093 , H03L7/095 , H03L7/107 , H03L7/18
CPC分类号： H03L7/0893 , H03L7/0896 , H03L7/095 , H03L7/107 , H03L7/18
摘要： PROBLEM TO BE SOLVED: To improve the jitter characteristics and spectral characteristics of a PLL circuit, by reducing the operating noise and charge errors of a charge pump circuit, and further, to shorten the time, until the PLL circuit is locked. SOLUTION: A control signal generated by a control circuit 5 generates the control signal, corresponding to the output of a phase comparison/lock detecting circuit 4 and is inputted to the charge pump circuit 6. The charge pump circuit 6 is provided with four current sources 61, 62, 63, and 64, three P-channel MOS transistors P1, P2, and P3, and three N-channel transistors N1, N2, and N3. The transistor P1 is turned on/off by the up-signal of the phase comparison/lock detecting circuit 4. The transistor N1 is turned on/off by the down-signal of the phase comparison/lock detecting circuit 4. Each of the transistors P2, P3, N2, and N3 is turned on/off, on the basis of the control signal of the control circuit 5. Consequently, the output signal from a VCO control terminal 65 is inputted to a VCO8 via a low-pass filter 7, while a current is made to always flow to the charge pump circuit 6. COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：通过降低电荷泵电路的工作噪声和充电误差来提高PLL电路的抖动特性和频谱特性，并且缩短时间，直到PLL电路被锁定为止。解决方案：由控制电路5产生的控制信号产生对应于相位比较/锁定检测电路4的输出的控制信号，并输入到电荷泵电路6.电荷泵电路6设有四个电流源61,62,63和64,3个P沟道MOS晶体管P1，P2和P3以及三个N沟道晶体管N1，N2和N3。晶体管P1由相位比较/锁定检测电路4的上升信号导通/截止。晶体管N1通过相位比较/锁定检测电路4的下降信号导通/截止。每个晶体管基于控制电路5的控制信号，P2，P3，N2和N3导通/截止。因此，来自VCO控制端65的输出信号通过低通滤波器7被输入到VCO8 ，而电流总是流向电荷泵电路6.版权所有（C）2006，JPO＆NCIPI

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