发明名称 |
Current mirror having a base current compensation circuit with a compensation mirror and a voltage clamp |
摘要 |
A base current compensation circuit is configured for connection to a first current mirror that has lost base current. The compensation circuit includes a compensation mirror coupled in a feedback loop to the first current mirror. A current sensing transistor senses the lost base current. A current duplicating mirror is coupled to the current sensing transistor and generates a compensation current in response to the sensed lost base current. The compensation current is fed back into the first current mirror to compensate for the lost base current. A voltage clamp is coupled to the current sensing transistor and the current duplicating transistor. The voltage clamp maintains approximately equal collector-base voltages in the current sensing transistor and the current duplicating transistor to increase accuracy of the compensation mirror.
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申请公布号 |
US5282094(A) |
申请公布日期 |
1994.01.25 |
申请号 |
US19930067671 |
申请日期 |
1993.05.26 |
申请人 |
VTC INC. |
发明人 |
NGO, TUAN V. |
分类号 |
G11B5/09;(IPC1-7):G11B5/09;G11B5/02 |
主分类号 |
G11B5/09 |
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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