| 摘要 |
<p>A digital-to-analog converter operates in accordance with the mu 255 compression law and includes an amplifier, a reference voltage source and a feedback resistor ladder attenuator from the amplifier output to its input. The attenuator is multiplicatively weighted and referenced to the reference voltage. A current source or sink including a linearly weighted resistor ladder is also connected to the amplifier input. An analog-to-digital converter includes a similar resistor ladder attenuator and resistor ladder current source or sink at the input of a comparator. The attenuator is referenced to a reference potential. The digital signal is determined by logic circuitry responsive to the comparator output in a successive approximation operation.</p> |
