This is a design circuit divides down the high common mode current shunt voltage, theoretically permitting the 5V powered amplifier to extract the current measurement over a 20V to 90V APD bias range. This is the figure of the circuit.
This circuit is based on LT1789 single op amp. This circuit is arrangement introduces prohibitive errors, primarily because the desired signal is also divided down. The current measurement information is buried in the divider resistor’s tolerance, even with 0.01% components. The desired 1% accuracy over a 100mA to 1nA range cannot be achieved. Finally, although the amplifier operates from a single 5V supply, it cannot swing all the way to zero. [Circuit’s source: Linear Technology Notes].
This circuit is based on LT1789 single op amp. This circuit is arrangement introduces prohibitive errors, primarily because the desired signal is also divided down. The current measurement information is buried in the divider resistor’s tolerance, even with 0.01% components. The desired 1% accuracy over a 100mA to 1nA range cannot be achieved. Finally, although the amplifier operates from a single 5V supply, it cannot swing all the way to zero. [Circuit’s source: Linear Technology Notes].
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