Patent ID: 8395540
Filing Date: 2013-03-12
Classification: H03M

Abstract:
1. An analog to digital converter comprising: an analog signal input port, configured for receiving analog signals; a reference voltage generation circuit, configured for producing a reference voltage; a controllable switch; a control unit comprising a control port and a counter, wherein, the control unit is connected to the controllable switch via the control port, and outputs an on signal or off signal to turn on or turn off the controllable switch via the control port, the counter starts to count when the control unit outputs the off signal; an integral circuit, configured for entering a ready state when the controllable switch is turned on, and executing integral action to integrate the reference voltage and output a voltage enhanced gradually when the controllable switch is turned off; a comparison circuit, configured for comparing the voltage outputted by the integral circuit with the voltage of the analog signals received by the analog signal input port, and outputting an interrupt signal to the counter of the control unit at the moment the voltage outputted by the integral circuit is higher than the voltage of the analog signals; wherein, the counter stops counting when receiving the interrupt signal, the control unit determines a digital value corresponding to the analog signals according to a count value counted by the counter.