Invention Grant
US5847582A Apparatus and method for producing symmetric capture range in
two-quadrant phase detector PLLs using nonsymmetric pulse waves
失效
使用非对称脉冲波在双象限相位检测器PLL中产生对称捕获范围的装置和方法
- Patent Title: Apparatus and method for producing symmetric capture range in two-quadrant phase detector PLLs using nonsymmetric pulse waves
- Patent Title (中): 使用非对称脉冲波在双象限相位检测器PLL中产生对称捕获范围的装置和方法
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Application No.: US902863Application Date: 1997-07-30
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Publication No.: US5847582APublication Date: 1998-12-08
- Inventor: Victor P. Schrader , Steve Hobrecht
- Applicant: Victor P. Schrader , Steve Hobrecht
- Applicant Address: CA Santa Clara
- Assignee: National Semiconductor Corporation
- Current Assignee: National Semiconductor Corporation
- Current Assignee Address: CA Santa Clara
- Main IPC: H03D13/00
- IPC: H03D13/00 ; H03L7/085 ; H04N5/12 ; H03L7/08
Abstract:
A symmetric capture range is produced in a two-quadrant phase detector phase locked loop that utilizes nonsymmetric pulse waves. The phase detector is enabled only during VCO pulses. A latch stores the relative relationship between the leading edge of the input pulse and the center of the VCO pulse in the previous cycle. If the phase angle .theta. form the VCO pulse center to the leading edge of the input pulse is 0 deg
Public/Granted literature
- US5284953A Diastereomer salt of optically active quinolinemevalonic acid Public/Granted day:1994-02-08
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