Patent ID: 8928307
Filing Date: 2015-01-06
Classification: G01R

Abstract:
1. A signal detection circuit, comprising: a signal conversion module, a threshold control module, and a comparison module, wherein: the signal conversion module is configured to: convert a reference voltage signal into a reference current signal, and send the reference current signal to the threshold control module; and convert a voltage signal to be detected into a current signal to be detected, and send the current signal to be detected to the comparison module; the threshold control module is configured to: generate a threshold current signal according the reference current signal, and send the threshold current signal to the comparison module; and receive a threshold control signal, and change magnitude of the threshold current signal according to the threshold control signal; and the comparison module is configured to compare magnitude of the current signal to be detected with the magnitude of the threshold current signal, and output a comparison result, wherein the threshold control signal is a digital threshold control signal; the threshold control module is configured to: generate, according to the reference current signal, a threshold current signal having a first proportional relation with the reference current signal; and receive a digital threshold control signal that is input according to detection requirements, and adjust the first proportional relation according to the digital threshold control signal, so as to change the magnitude of the threshold current signal, and the hysteresis generation module is configured to: generate, according to the reference current signal, a hysteresis current signal having a second proportional relation with the reference current signal; receive the comparison result output by the comparison module; selectively superimpose the hysteresis current signal onto the threshold current signal according to the comparison result; and receive a digital hysteresis control signal that is input according to the detection requirements, and adjust the second proportional relation according to the digital hysteresis control signal, so as to change magnitude of the hysteresis current signal.