发明授权
- 专利标题: Charge pump for use in a phase-locked loop
- 专利标题(中): 电荷泵用于锁相环
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申请号: US749156申请日: 1985-06-26
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公开(公告)号: US4636748A公开(公告)日: 1987-01-13
- 发明人: Paul W. Latham, II
- 申请人: Paul W. Latham, II
- 申请人地址: MA Westborough
- 专利权人: Data General Corporation
- 当前专利权人: Data General Corporation
- 当前专利权人地址: MA Westborough
- 主分类号: H03L7/089
- IPC分类号: H03L7/089 ; H03L7/00
摘要:
An improved charge pump for use in a phase-locked loop is disclosed in which there is only one current source, and in which all switching components pass current in the same direction. The charge pump may thus be constructed entirely of NPN transistors, which makes it possible to embody it in a single integrated circuit chip. The pump up and pump down currents inherently have the same magnitude and transient characteristics, thus minimizing steady-state errors.