发明名称 |
Low power variable base drive circuit |
摘要 |
A variable base drive output circuit that is operational for low-potential power supplies. The output circuit includes a current regulating branch and a base drive branch. A control transistor is logically coupled to an enable signal and an input signal to be propagated. Activation of that control transistor establishes a current path to the base of a bipolar pulldown transistor that is coupled to output. The current regulating branch includes a resistance device in series with current limiting transistors. The resistance device is coupled to the control node of a base current transistor such that when the load on the output node drops, the current to the base of the pulldown transistor also drops. The result is a savings in Icc current for logic LOW signals at the output node. The variable base drive output circuit is operable for low supply potentials.
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申请公布号 |
US6249148(B1) |
申请公布日期 |
2001.06.19 |
申请号 |
US20000501249 |
申请日期 |
2000.02.10 |
申请人 |
FAIRCHILD SEMICONDUCTOR CORPORATION |
发明人 |
MORRILL DAVID P. |
分类号 |
H03K19/08;H03K19/00;H03K19/0175;(IPC1-7):H03K19/175 |
主分类号 |
H03K19/08 |
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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