LINEARITY ERROR CORRECTING CIRCUIT IN DA CONVERTER

摘要

PURPOSE:To improve the error correction accuracy of a DA converter by generating sequentially and repetitively a specific bit pattern in the error detecting operation and using an analog circuit cutting off the DC component of an output analog signal of the DA converter. CONSTITUTION:A changeover switch 27 is connected to the output side of a summing amplifier 16, switched with a control signal 28 from a control section 11 and an output terminal 24 is connected to a high pass filter 29 or a window comparator 31. The output of the comparator 31 is connected to the control section 11. Further, a multiplexer 32 is inserted between a memory 18 and a correction DA converting circuit 23, controlled with a control signal 33 from the control section 11, a correction data Dcal from the memory 18 is fed to a terminal I through a terminal G or a detection digital data Ddet from the control section 11 is fed to the terminal I through a terminal H.