Patent ID: 7705755

Claim:
A signal converting apparatus with built-in self test, comprising: a comparing device, for comparing signals inputted to a first input terminal and a second input terminal to generate a comparing result; a first signal converting circuit, coupled to the first input terminal of the comparing device, for receiving a first reference voltage and a second reference voltage under a self test mode, and generating a first comparing signal to the first input terminal of the comparing device according to a first set of control signals; a second signal converting circuit, coupled to the second input terminal of the comparing device, for receiving the first reference voltage and the second reference voltage under the self test mode, and generating a second comparing signal to the second input terminal of the comparing device according to the first set of control signals; a voltage dividing device, coupled to the first and the second signal converting circuits, for generating at least an analog signal according to a second set of control signals to the first and the second signal converting circuits under the self test mode; and a control logic device, coupled to the comparing device, the first and the second signal converting circuits and the voltage dividing device, for generating the first and the second set of control signals.