Invention Grant
- Patent Title: Methods of clock signal generation with selected phase delay
- Patent Title (中): 选择相位延迟产生时钟信号的方法
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Application No.: US13287109Application Date: 2011-11-01
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Publication No.: US08502586B1Publication Date: 2013-08-06
- Inventor: Eric Naviasky , Thomas E. Wilson
- Applicant: Eric Naviasky , Thomas E. Wilson
- Applicant Address: US CA San Jose
- Assignee: Cadence Design Systems, Inc.
- Current Assignee: Cadence Design Systems, Inc.
- Current Assignee Address: US CA San Jose
- Agency: Alford Law Group, Inc.
- Main IPC: H03H11/16
- IPC: H03H11/16 ; H03K5/13

Abstract:
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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