ANALOG FRONT END DEVICE FOR LOW FREQUENCY SIGNAL DETECTION AND TRANSMISSION SYSTEM

摘要

An analog front end device for low frequency signal detection and transmission system is provided by the present invention, which is applied to short distance communication system, and includes: at least one magnetic induction module, at least one low pass filtering module, at least one amplifier, at least one digital/analog converter and at least one comparator, said magnetic induction module, said low pass filtering module, and said amplifier are connected in succession, the output port of said amplifier is connected with the positive input port of said comparator, the output port of said digital/analog converter is connected with the negative input port of said comparator, said amplifier is an amplifier with double input port and single output port. The present invention can reduce the interference of circuit noise and environment noise on the low frequency signal received by the low frequency signal detection and transmission system, thereby can improve the accuracy of distance detection and control of low frequency alternating magnetic field.