发明名称 |
HIGH SIDE CURRENT SENSE AMPLIFIER |
摘要 |
A single stage current sense amplifier is described that generates a differential output that is proportional to a current through a sense resistor. The voltage across the sense resistor is Vsense. The current sense amplifier includes a differential transconductance amplifier having high impedance input terminals. An on-chip RC filter filters transients in the Vsense signal. A feedback circuit for each leg of the amplifier causes a pair of input transistors to conduct a fixed constant current irrespective of Vsense, which stabilizes the transconductance. A gain control resistor (Re) is coupled across terminals of the pair of input transistors and has Vsense across it. The current through the gain control resistor is therefore Vsensex1/Re. A level shifting circuit coupled to each of the input transistors lowers a common mode voltage at an output of the amplifier. Chopper circuits at the input and output cancel any offset voltages. |
申请公布号 |
EP2839579(A1) |
申请公布日期 |
2015.02.25 |
申请号 |
EP20120723319 |
申请日期 |
2012.05.09 |
申请人 |
LINEAR TECHNOLOGY CORPORATION |
发明人 |
LIU, HENGSHENG;PORTER, EDSON WAYNE;MANLOVE, GREGORY JON |
分类号 |
H03F3/393;G01R19/00;H03F1/26;H03F3/45 |
主分类号 |
H03F3/393 |
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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