发明名称 |
Method and apparatus for output driver calibration |
摘要 |
An output driver calibration circuit determines calibration values for configuring adjustable impedance output drivers. Output drivers are calibrated by generating a first variable count in response to comparing a reference voltage to a first voltage at a calibration terminal when an external load is connected. A first pull-up impedance circuit is varied in response to a first variable count and varying an impedance in a second variable pull-up impedance circuit in response to the first variable count. A second variable count is generated responsive to comparing the reference voltage to a second voltage at a reference node between the second variable pull-up impedance circuit and is serially connected to a variable pull-down impedance circuit. The impedance to the variable pull-down impedance circuit is varied in response to the second variable count. The first and second variable counts for configuring the output drivers are output when a steady state is achieved.
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申请公布号 |
US7514954(B2) |
申请公布日期 |
2009.04.07 |
申请号 |
US20060432421 |
申请日期 |
2006.05.10 |
申请人 |
MICRON TECHNOLOGY, INC. |
发明人 |
KIM KANG YONG;WRIGHT JEFFREY P. |
分类号 |
H03K17/16;G11C7/00;H03K19/003 |
主分类号 |
H03K17/16 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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