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#1821078
Hello, I am looking for a circuit that forms the average of a current over a given time (like as long as someone presses a push-button). Does anyone knows such a circuit? Please tell me the advantages and disadvantages, too. The reason why I am asking is because I have to develop a device that can measure a very low current and therefore it needs a very small resolution (0,001uA) but also has got a wide measuring range (10uA) - actually it should be able to measure up to 100mA but I divided the range in smaller pieces. Usually I could choose a clock-frequency for the uC independently from the resolution of the ADC but building a average joins these two separate aspects together. So, I am now thinking about using a ADC with a very high resolution, which means that I can do all the calculating within the uC, or building the average analog and using a ADC with a ordinary resolution of (10 or 12bit). Of course I have considered the solution to integrate first and then diving within a uC-program. But as I have to develop this device for my thesis I want to know something about every of the three solutions. And thats why I am especially asking now for the complete analog solution. Many thanks in advance! Gabriel