Patent ID: 7187315

Claim:
An apparatus for converting a digital input signal into an analog output signal, comprising: first circuit means for receiving the digital input signal that is representative of the analog output signal and suitable for producing a first signal on an output line; second circuit means for supplying a second signal on said output line in reply to a further digital signal, said further digital signal being a function of external variables, and a union of said first and said second signal on said output line forming said analog output signal; and wherein said first and second circuit means each comprise at least one array of current sources that produce respective output currents, an array of switches that are connected to switch the respective outputs of said current sources towards said output line in response to respective control signals so as to supply said first output signal on said output line, control means having said digital input signal that is representative of the analog output signal and suitable for sending several of said control signals to respective several of said switches for producing said first output signal, and further control means suitable for producing control signals to the remaining switches of said array of switches in response to said further digital signal.