Patent ID: 7138932

Claim:
A signal converting apparatus (SCA), for switching the operation mode thereof into an analog-to-digital mode or a digital-to-analog mode by a control signal, wherein the SCA converts an analog signal at an analog input end thereof and outputs the converted digital signal at a digital output end thereof in the analog-to-digital mode, and the SCA converts a digital signal at a digital input end thereof and outputs the converted analog signal at an analog output end thereof in the digital-to-analog mode; the SCA comprising: a feedback unit, for outputting at least one feedback signal according to the digital signal output from the digital output end; a first sampling unit, coupled to the analog input end, the digital input end and the feedback unit, in the analog-to-digital mode, for sampling the analog signal at the analog input end into a sampling signal during a first period and outputting a differential signal according to the sampling signal and the corresponding feedback signal output from the feedback unit during a second period, and in the digital-to-analog mode, for sampling the digital signal at the digital input end into a sampling signal during the first period and outputting a differential signal according to the sampling signal and an integration result from one of the integrators disposed between the first sampling unit and the analog output end during the second period; a first integrator, electrically coupled to the first sampling unit and the analog output end, for integrating the differential signal; and a quantizer, electrically coupled to the first integrator and the digital output end, for quantizing the input signal of the quantizer and providing a digital signal output at the digital output end.