Abstract: The present invention is characterized that a digital-to-analog converter having ordinal accuracy and one or more current sources are combined and the output currents of the current sources are accurately controlled to have a predetermined relationship with regard to the reference current which is a full-scale value of the analog output current of DAC so that the output current of the current sources designated by bits added to the superior bit of the digital input signal depending on the number of the current sources and the analog output current in response to the digital input signal with the added bits are added to produce an analog signal corresponding to the digital input signal.

Abstract: A digital-to-analog conversion system includes a digital-to-analog converter, a source of at least one set of digital input signals and a signal for error compensation and a digital signal for error detection to the converter, a switch to selectively couple either the one set of digital input signals and the signal for error compensation or the signal for error detection to the converter, a clock to generate a switching signal having a predetermined period and duration which is coupled to control the switch, a distribution switch for selectively coupling the output of the digital-to-analog converter to two different terminals, receiving a control input from the clock, a sample and hold circuit to sample and hold the output of the digital-to-analog converter, a detector for detecting a linearity error in the digital-to-analog converter output signal when the digital signal for error detection is coupled as an input thereto, a memory for storing the output of the detector, a circuit to write the output of the d