发明授权
US09543969B2 High-speed resistor-based charge pump for active loop filter-based phase-locked loops
有权
基于高速电阻器的电荷泵,用于基于有源环路滤波器的锁相环
- 专利标题: High-speed resistor-based charge pump for active loop filter-based phase-locked loops
- 专利标题(中): 基于高速电阻器的电荷泵,用于基于有源环路滤波器的锁相环
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申请号: US14961590申请日: 2015-12-07
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公开(公告)号: US09543969B2公开(公告)日: 2017-01-10
- 发明人: Vishnu Ravinuthula , Kenneth George Maclean
- 申请人: Texas Instruments Incorporated
- 申请人地址: US TX Dallas
- 专利权人: TEXAS INSTRUMENTS INCORPORATED
- 当前专利权人: TEXAS INSTRUMENTS INCORPORATED
- 当前专利权人地址: US TX Dallas
- 代理商 Gregory J. Albin; Charles A. Brill; Frank D. Cimino
- 主分类号: H03L7/06
- IPC分类号: H03L7/06 ; H03L7/085
摘要:
Techniques are described for increasing the speed of a resistor-based charge pump for an active loop filter-based phase-locked loop (PLL). The techniques may include placing a low-resistance discharge path between respective nodes of a current source and sink in a charge pump, and selectively activating the low-resistance discharge path when the charge pump is turned off. The low-resistance discharge path may have a resistance that is lower than the resistance of other current paths between the respective nodes in the charge pump (e.g., current paths formed by the resistors included in the current source and sink of the charge pump), thereby reducing the amount of time needed to reset the charge on the respective nodes when the charge pump is turned off. In this way, the speed of a resistor-based charge pump may be increased, thereby allowing the overall speed of an active filter-based PLL to be increased.