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Unformatted text preview: Understand the operation of a DAC according to its timing diagram, and devise a circuit that can operate at a desired range. DAC의 timing diagram에 따른 사용 방법을 이해하고 원하는 range에 맞추어 입출력하 는 회로를 제작한다. ① Understand the characteristics and the operating principle of a DAC utilizing the current mirror using R-2R ② Understand the characteristics and the operating principle of DACs 3. Theory Thermometer DACs and binary weighted DACs require large silicon area since 2 N components are required. Binary weighted DACs also require a very precise ratio of components which limit the resolution of the DAC for components with larger values have lower accuracy. To devise a DAC while utilizing less number of devices and smaller ratio between the components, R-2R structure as shown in figure 4-1 can be used. V ref R R R R 2R 2R 2R R R f V o R 2R R 2R R 2R a c b I 2I I 4I 2I 4I 8I Figure 4-1 R-2R DAC In figure 4-1, the node of 2R that is connected to a switch and node ⓐ is, regardless of the switch configuration, always set to 0. In this case, since the two resistors on the right are connected in series, the equivalent resistance from node...
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This note was uploaded on 11/08/2011 for the course EE 111 taught by Professor Kim during the Spring '11 term at Korea University.
- Spring '11