Invention Grant
- Patent Title: Analog duty cycle correction loop for clocks
- Patent Title (中): 时钟模拟占空比校正回路
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Application No.: US12466288Application Date: 2009-05-14
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Publication No.: US07898309B1Publication Date: 2011-03-01
- Inventor: Hakan Dogan
- Applicant: Hakan Dogan
- Applicant Address: US CA San Jose
- Assignee: Atheros Communications, Inc.
- Current Assignee: Atheros Communications, Inc.
- Current Assignee Address: US CA San Jose
- Agency: Bever, Hoffman & Harms, LLP
- Agent Jeanette S. Harms
- Main IPC: H03K3/017
- IPC: H03K3/017 ; H03K5/04 ; H03K7/08

Abstract:
Providing duty cycle correction can include determining whether a clock signal has a duty cycle greater than 50% based on averaging the clock signal and comparing that averaged clock signal to ½ VDD. When the duty cycle is greater than 50%, the clock signal can be selected. When the duty cycle is less than 50%, the inverted clock signal can be selected. Thus, a duty cycle corrected clock signal can be generated based on the clock signal or the inverted clock signal. Notably, a duty cycle control signal can be adjusted based on comparisons of an averaged, duty cycle corrected clock signal and predetermined low/high voltage ranges. Components performing comparing functions can be strobed based on a count performed on the clock signal.
Information query
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