Question

A current sensor is measuring the DC current that is flowing through a power circuit. The output of the current sensor is a raw voltage signal which varies according to the following equation V 2.50.02 Where I is the flowing current in A (value can be positive or negative). An engineer would like a microcontroller to be able to measure this current so that it can be used for control purposes. The available ADC is 12-bit in resolution and measures voltage in the range of -3.3V to 3.3V. The current is required to be measurable in the range of -2A to 2A and shall have a minimum quality resolution of at least 0.002A. Moreover, it is required that the current sensor reading be 1st order low passed filtered with a cut off frequency of 250Hz via the analogue circuitry Please design an analogue circuit schematic that can be used to achieve the above objectives. In your solution, please provide 1. A complete schematic of your circuit. The purpose of each major section of the circuit shall be clearly shown either by well-known names or by a clear short description. 2. All passive component values in your circuit shall be designed with appropriate numbers and any associated transfer functions or static gain formulae shall be either derived or referenced. 3. Provide a solid verification that both the range and the minimum resolution requirement for the interpreted current are met by your proposed schematic.

Answer 1

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