| 摘要 |
PURPOSE:To obtain a high-precision D/A converter inexpensively with high yield, by providing a digital memory and the second D/A converter besides the first D/A converter. CONSTITUTION:The first D/A converter (consisting of current switch groups S1- SN and constant current source parts I1-IN) is provided with a data decoder 2, which decodes, for example, upper two bits of an input digital code to be converted, and an electrically writable digital memory 3. Constant current sources IA-ID for the second D/A converter, current switch groups SA-SD, and resistances R1 and R2 for attenuating outputs from constant current sources IA-ID to proper values to add them to an output terminal 1 of an analog conversion signal are provided, and the error due to the variance of steps is corrected after the completion of products. |
