发明授权
- 专利标题: Phase interpolator circuit with two phase capacitor charging
- 专利标题(中): 双相电容充电相位内插电路
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申请号: US12270038申请日: 2008-11-13
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公开(公告)号: US08063686B1公开(公告)日: 2011-11-22
- 发明人: Eric Naviasky , Thomas E. Wilson
- 申请人: Eric Naviasky , Thomas E. Wilson
- 申请人地址: US CA San Jose
- 专利权人: Cadence Design Systems, Inc.
- 当前专利权人: Cadence Design Systems, Inc.
- 当前专利权人地址: US CA San Jose
- 代理机构: Alford Law Group, Inc.
- 代理商 William E. Alford
- 主分类号: H03H11/16
- IPC分类号: H03H11/16 ; H03K5/13
摘要:
In one embodiment of the invention, a method is disclosed to generate a clock output signal with selected phase. The method includes selecting a phase delay for the clock output signal; charging a capacitor with a first weighted current during a first phase input clock, charging the capacitor with a second weighted current during a portion of a second phase input clock, and determining if a voltage across the capacitor is greater than or equal to a threshold voltage to generate a first edge of the clock output signal with the selected phase delay. The first weighted current may have a weighting of N out of M to charge the capacitor with a predetermined rate of change in voltage in response to the selected phase delay. The second weighted current may have a weighting of M out of M to charge the capacitor with a constant rate of change.
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