Micropower zero-drift op-amp enables wireless current sense

摘要

Many current sense circuits follow the same simple recipe: develop a voltage drop across a sense resistor, amplify the voltage, then read it with an ADC to know the current. However, if the sense resistor is at a voltage that is different from system ground, things can quickly get complicated. Typical solutions bridge the voltage difference in either the analogue or digital domain. Now, there is a different approach - wireless.