5 Summary

From the discussion of these various topics above, it shows that an algorithm may be established to help in the realization of designing a charge filter for a current shunt amplifier using the following steps:

1. Choose the current sense amplifier that is correct for your application.
2. Determine the digital sampling requirements of your system, and shortlist possible ADCs that may work for the intended design. Important parameters to note are default acquisition time, sample and hold capacitance, and resolution.
3. Use the bandwidth of the amplifier, resolution of the ADC, and the assumption of voltage droop to approximate the minimum needed acquisition time.
4. Either select a device with the appropriate acquisition time, or identify if the ADC chosen has the ability to extend acquisition time via the use of an external clock.
5. Determine the potential range of values for C_FILT based on the C_SH value of the chosen converter. This can quickly be achieved using the Analog Engineer's Calculator.
6. With the value of C_FILT, calculate the needed value of R_FILT.
7. Ensure that the chosen value of R_FILT is greater than the minimum required calcuation for stability based on the amplifiers output impedance.
8. Simulate the designed system using the created switching model to ensure proper settling inside the designed parameters. Iterative analysis of R_FILT can help achieve additional accuracy if necessary.