发明名称 |
Method and apparatus for providing a high speed charge pump with low static error |
摘要 |
A charge pump that receives complimentary metal-oxide semiconductor (CMOS) input signals, has high noise immunity, low static error and works at low power supply voltages. The charge pump includes a current switch for receiving a control signal from a control circuit and for generating a charge signal, a loop filter having a first and second node, and a common-mode loop for sensing the charge signal from the current switch and for providing a voltage level adjustment signal to the first node of the loop filter in response thereto. The common-mode loop includes a sensing circuit for sensing the voltage level at the first and second node, an averaging circuit for producing an averaged voltage signal, a comparing circuit for comparing the averaged voltage signal to a reference signal to produce a feedback control output signal, and a feedback current source for adjusting the voltage level at the first node of the loop in response to the feedback control output signal.
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申请公布号 |
US5663689(A) |
申请公布日期 |
1997.09.02 |
申请号 |
US19960673725 |
申请日期 |
1996.06.26 |
申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
BAUMGARTNER, STEVEN J.;PHILPOTT, RICK A.;SILJENBERG, DAVID W. |
分类号 |
H03G3/30;H03L7/089;(IPC1-7):H03L7/089;H03G3/20 |
主分类号 |
H03G3/30 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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