| 摘要 |
This invention relates to digital-to-analog conversion, for the conversion of digital signals into corresponding analog signals. It is particularly applicable to high resolution digital-to-analog conversion. In a particular form of the invention, a cascaded series of individual voltage dividers (20-23; 38-41; and 56-60) is used to divide a voltage reference signal with successively finer resolution. Voltage follower amplifiers (33, 36, 51, 54) are used between the individual divider stages to substantially eliminate any loading effects upon the outputs of the individual divider stages. The connection pattern is such that only one connection within one divider stage will be switched for a transition between two adjacent digital signals, and two adjacent analog signals levels. The result is a useful resolution which will normally correspond to the number of divider stages, even though the component accuracy and matching, and the absolute conversion accuracy, may not be that precise. The invention is also applicable to analog-to-digital measurement or conversion via the adjustment of a digital signal so that a generated analog signal corresponds to an analog signal which is to be measured. |
