发明申请
- 专利标题: Duty Cycle Correction Circuit Whose Operation is Largely Independent of Operating Voltage and Process
- 专利标题(中): 占空比校正电路,其操作与工作电压和工艺大不相同
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申请号: US12140335申请日: 2008-06-17
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公开(公告)号: US20080246524A1公开(公告)日: 2008-10-09
- 发明人: David W. Boerstler , Eskinder Hailu , Jieming Qi
- 申请人: David W. Boerstler , Eskinder Hailu , Jieming Qi
- 申请人地址: US NY Armonk
- 专利权人: International Business Machines Corporation
- 当前专利权人: International Business Machines Corporation
- 当前专利权人地址: US NY Armonk
- 主分类号: H03K3/017
- IPC分类号: H03K3/017
摘要:
A Duty Cycle Correction (DCC) circuit is provide in which pairs of field effect transistors (FETs) in known DCC circuit topologies are replaced with linear resistors coupled to switches of the DCC circuit such that when the switch is open, the input signal is routed through the linear resistors. The linear resistors are more tolerant of process, voltage and temperature (PVT) fluctuations than FETs and thus, the resulting DCC circuit provides a relatively smaller change in DCC correction range with PVT fluctuations than the known DCC circuit topology that employs FETs. The linear resistors may be provided in parallel with the switches and in series with a pair of FETs having relatively large resistance values. The linear resistors provide resistance that pulls-up or pulls-down the pulse width of the input signal so as to provide correction to the duty cycle of the input signal.