전기전자응용실험_4주차 예비 보고서
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- 2011.07.09
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- 2010.03
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한컴오피스
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전기전자 응용실험에서 digital to analog converter의 예비보고서
목차
1. Goals & Objectives
2. Theory & Question
본문내용
1. Goals & Objectives
Understand the characteristics and the operation principle of a DAC according to its timing diagram, and devise a circuit that can operate at a desired range.
2. Theory & Question
(1) Digital to Analog Converter(DAC)
A DAC converts an abstract finite-precision number (usually a fixed-point binary number) into a concrete physical quantity (e.g., a voltage or a pressure). In particular, DACs are often used to convert finite-precision time series data to a continually varying physical signal.
< Figure 1. Sampling from Analog signal>
A typical DAC converts the abstract numbers into a concrete sequence of impulses that are then processed by a reconstruction filter using some form of interpolation to fill in data between the impulses. Other DAC methods (e.g., methods based on Delta-sigma modulation) produce a pulse-density modulated signal that can then be filtered in a similar way to produce a smoothly varying signal.
By the Nyquist–Shannon sampling theorem, sampled data can be reconstructed perfectly provided that its bandwidth meets certain requirements (e.g., a baseband signal with bandwidth less than the Nyquist frequency). However, even with an ideal reconstruction filter, digital sampling introduces quantization error that makes perfect reconstruction practically impossible. Increasing the digital resolution (i.e., increasing the number of bits used in each sample) or introducing sampling dither can reduce this error.
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