Invention Grant
US08237475B1 Techniques for generating PVT compensated phase offset to improve accuracy of a locked loop
有权
用于产生PVT补偿相位偏移以提高锁定环路精度的技术
- Patent Title: Techniques for generating PVT compensated phase offset to improve accuracy of a locked loop
- Patent Title (中): 用于产生PVT补偿相位偏移以提高锁定环路精度的技术
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Application No.: US12248031Application Date: 2008-10-08
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Publication No.: US08237475B1Publication Date: 2012-08-07
- Inventor: Pradeep Nagarajan , Sean Shau-Tu Lu , Chiakang Sung , Joseph Huang , Yan Chong
- Applicant: Pradeep Nagarajan , Sean Shau-Tu Lu , Chiakang Sung , Joseph Huang , Yan Chong
- Applicant Address: US CA San Jose
- Assignee: Altera Corporation
- Current Assignee: Altera Corporation
- Current Assignee Address: US CA San Jose
- Agent Steven J. Cahill
- Main IPC: H03L7/06
- IPC: H03L7/06

Abstract:
A circuit includes a locked loop and a phase offset circuit. The locked loop generates first control signals for controlling a first delay in the locked loop. The phase offset circuit delays an input signal by a second delay that is controlled by second control signals to generate a delayed signal. The phase offset circuit generates the second control signals by adjusting the first control signals to increase the accuracy of the delayed signal with respect to a target phase. The second control signals compensate for at least a portion of a change in the second delay that is caused by a variation in at least one of a process, a supply voltage, and a temperature of the circuit.
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