公开(公告)号：US07969247B2

公开(公告)日：2011-06-28

申请号：US12493761

申请日：2009-06-29

申请人： Zhenyu Yang ,  Tianwei Liu

发明人： Zhenyu Yang ,  Tianwei Liu

IPC分类号： H03L7/00

CPC分类号： H03L7/0895 ,  H03L7/1976

摘要： A delta-sigma fractional-N frequency synthesizer having a charge pump with error canceling circuitry eliminates a non-linear term from the charge pump transfer function. The charge pump includes a matched pair of charging current sources, each supplying a first current IP1 to a common node, when enabled. The charge pump also includes a matched pair of discharging current sources, each sinking a second current IN1 from the common node, when enabled. The error canceling circuitry includes a charging current source, which supplies a current equal to the second current IN1 to the common node, when enabled. The error canceling circuitry also includes a discharging current source, which sinks a current equal to the first current IP1 from the common node, when enabled. The charging and discharging current sources of the error canceling circuitry are both enabled when either one of the matched pairs of charging and discharging current sources is enabled.

摘要翻译： 具有带有误差消除电路的电荷泵的delta-sigma分数-N频率合成器消除了来自电荷泵传递函数的非线性项。 充电泵包括一对匹配的充电电流源，每个充电电流源在启用时都将第一个当前IP1提供给公共节点。 电荷泵还包括一对匹配的放电电流源，当使能时，每个放电电流源都从公共节点吸收第二个电流IN1。 误差消除电路包括充电电流源，其在启用时将等于第二电流IN1的电流提供给公共节点。 误码消除电路还包括放电电流源，当使能时，该放电电流源从公共节点吸收等于第一当前IP1的电流。 当匹配的充电和放电电流对中的任一个被使能时，错误消除电路的充电和放电电流源都被使能。

公开(公告)号：US20100327981A1

公开(公告)日：2010-12-30

申请号：US12493761

申请日：2009-06-29

申请人： Zhenyu Yang ,  Tianwei Liu

发明人： Zhenyu Yang ,  Tianwei Liu

IPC分类号： H03L7/00 ,  G05F1/10

CPC分类号： H03L7/0895 ,  H03L7/1976

摘要： A delta-sigma fractional-N frequency synthesizer having a charge pump with error canceling circuitry eliminates a non-linear term from the charge pump transfer function. The charge pump includes a matched pair of charging current sources, each supplying a first current IP1 to a common node, when enabled. The charge pump also includes a matched pair of discharging current sources, each sinking a second current IN1 from the common node, when enabled. The error canceling circuitry includes a charging current source, which supplies a current equal to the second current IN1 to the common node, when enabled. The error canceling circuitry also includes a discharging current source, which sinks a current equal to the first current IP1 from the common node, when enabled. The charging and discharging current sources of the error canceling circuitry are both enabled when either one of the matched pairs of charging and discharging current sources is enabled.

摘要翻译： 具有带有误差消除电路的电荷泵的delta-sigma分数-N频率合成器消除了来自电荷泵传递函数的非线性项。 充电泵包括一对匹配的充电电流源，每个充电电流源在启用时都将第一个当前IP1提供给公共节点。 电荷泵还包括一对匹配的放电电流源，当使能时，每个放电电流源都从公共节点吸收第二个电流IN1。 误差消除电路包括充电电流源，其在启用时将等于第二电流IN1的电流提供给公共节点。 误码消除电路还包括放电电流源，当使能时，该放电电流源从公共节点吸收等于第一当前IP1的电流。 当匹配的充电和放电电流对中的任一个被使能时，错误消除电路的充电和放电电流源都被使能。