扩大电流检测放大器的输入范围为0V

摘要：添加一个电荷泵提供±5V电源轨运算放大器的内部高边电流检测放大器。这一修改使该放大器感应电流下降到0V的共模输入。可以修改，以适应双向电流检测应用电路。
Maxim > App Notes > Amplifier and Comparator Circuits Power-Supply Circuits
Keywords: current-sense amplifier, charge pump, op amp, bidirectional current sensing Sep 20, 2007

APPLICATION NOTE 4078
Extend Current-Sense Amplifier's Input Range Down to 0V


Abstract:Adding a charge pump provides ±5V supply rails to the operational amplifier internal to a high-side current-sense
amplifier. This modification enables that amplifier to sense currents down to 0V common-mode inputs. The circuit can be modified
to accommodate bidirectional current-sense applications.

A similar article appeared in the February 15, 2007 issue of Electronic Design magazine.

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