CURRENT SAMPLING CIRCUIT AND METHOD

摘要

A current sampling circuit and method, the current sampling circuit comprising a proportional current outputting circuit (201) and a fully differential common-mode negative feedback circuit (202); the proportional current output circuit (201) is used to calculate the current outputted by a power device based on a preset proportion, and obtain the first proportional current and the second proportional current for output to the fully differential common-mode negative feedback circuit (202); the fully differential common-mode negative feedback circuit (202)is used to shunt the first proportional current and the second proportional current by using a fully differential common-mode negative feedback network and the bias current of the microampere level, and obtain a first sampling current and a second sampling current for constant output.