This is a simple design circuit to approaches attempt to address the current monitor problem. There are two types for this circuit. This is the figure of the types of current monitor circuit.
In figure (1), this circuit uses an instrumentation amplifier powered by a separate 35V rail to measure across the 1kW current shunt. In figure (2), this circuit is similar but derives its power supply from the APD bias line. Although both approaches function, they do not meet APD current sensing requirements. APD bias voltages can range to 90V, exceeding the amplifier’s supply and common mode voltage limits. Additionally, the measurement’s wide dynamic range requires the single rail powered amplifier to swing within 100mV of zero, which is impractical. Finally, it is desirable for the amplifiers to operate from a single, low voltage rail. [Circuit’s source: Linear Technology Notes].
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