| 摘要 |
Digital to analog conversion apparatus effects multiplication of a plurality of sets of digital words by other words and incorporates a compensation circuit to offset load variations. As applied to a color intensity variation circuit in a video color display, RAM's storing digital intensity signals and color signals are accessed to provide digital control signals for digital to analog converters (28, 29, 31, 32). The intensity D/A converter (28) provides an output VI representing intensity, which output is coupled as a reference signal to the D/A converters (29, 31, 32), which are of a switched ladder configuration, to provide analog output voltages representing red, green and blue color signals. Compensation signals (C0-C3) are applied to a weighted switched load compensating circuit (33) to offset loading effects on the intensity D/A converter (28). The compensation signals may be generated by a microprocessor (22) under software control. |
