Patent ID: 8525713

Claim:
A voltage converter for converting an analog input signal to a digital signal, the pulse-width of the digital signal being related to the amplitude of the analog input signal, the voltage converter comprising: a comparator for comparing the analog input signal and an analog feedback signal, so as to generate the digital signal; when the analog input signal is higher than the analog feedback signal, the digital signal having a first voltage level; when the analog input signal is lower than the analog feedback signal, the digital signal having a second voltage level different from the first voltage level; and a feedback module for resetting the analog feedback signal to an initial feedback voltage before the comparator starts to compare the analog input signal so that the pulse width of the digital signal is directly proportional to a difference of the analog input signal and the initial feedback voltage, and for adjusting the analog feedback signal based on the digital signal, so as to make the analog feedback signal approach the analog input signal.