| 摘要 |
A high precision digital to analog converter comprises the combination of an imperfect or low resolution digital to analog converter having an error function known in terms of orthonormal components and an error compensating device capable of generating correction terms which do not interact with one another. The correction terms are based on orthonormal components namely, the Walsh function components, of each signal level to be compensated. At most only one weighting value per bit is required, the combination of which will compensate for errors of any bit combination. In a specific embodiment employing feedforward compensation, the output of the low resolution converter and of the compensating device may be summed to produce a high performance, high precision converter with increased accuracy and resolution. In other specific embodiments, the compensating device responds to selected digital bit inputs to produce an analog output which is summed at an intermediate summing junction with the analog signal of the converter. |
