45 Lecture - SUCCESSIVE –APPROXIMATION ANALOGUE TO DIGITAL CONVERTER

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45 Lecture

CS302

Midterm & Final Term Short Notes

SUCCESSIVE –APPROXIMATION ANALOGUE TO DIGITAL CONVERTER

A successive-approximation analog-to-digital converter (SAR ADC) is a type of analog-to-digital converter that works by sequentially approximating an analog signal with a digital value. It uses a binary search algorithm to determine the digital


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  1. What is the basic principle of a successive-approximation analog-to-digital converter (SAR ADC)? A. Comparing the input signal with the reference signal B. Iteratively adjusting the digital value until it closely matches the input signal C. Using a binary search algorithm to determine the digital value D. All of the above Answer: D What is the advantage of using a SAR ADC? A. High resolution B. High accuracy C. Low power consumption D. All of the above Answer: D What is the maximum resolution of a 10-bit SAR ADC? A. 1023 B. 2047 C. 4095 D. 8191 Answer: C Which of the following is not a limitation of SAR ADCs? A. Limited sampling rate B. Limited input voltage range C. Limited input frequency range D. High power consumption Answer: D Which of the following is not a component of a SAR ADC? A. Digital-to-analog converter (DAC) B. Sample-and-hold amplifier (SHA) C. Successive approximation register (SAR) D. Operational amplifier (Op-Amp) Answer: D What is the function of the sample-and-hold amplifier (SHA) in a SAR ADC? A. To amplify the input signal B. To sample the input signal at a fixed interval C. To hold the sampled signal until the end of the conversion process D. None of the above Answer: C What is the advantage of using a capacitive DAC in a SAR ADC? A. High resolution B. High linearity C. Low power consumption D. All of the above Answer: D What is the maximum conversion rate of a 12-bit SAR ADC with a clock frequency of 10 MHz? A. 100 kS/s B. 200 kS/s C. 500 kS/s D. 1 MS/s Answer: A Which of the following is a disadvantage of a SAR ADC? A. Slow conversion speed B. High cost C. Limited resolution D. All of the above Answer: A What is the disadvantage of using a SAR ADC in applications with a high input frequency? A. Low resolution B. High power consumption C. Limited input voltage range D. Limited sampling rate Answer: D



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  1. What is an analog-to-digital converter? An analog-to-digital converter is a device that converts analog signals into digital signals. What is successive-approximation ADC? Successive-approximation ADC is a type of analog-to-digital converter that uses a binary search algorithm to convert analog signals to digital signals. What is the main advantage of successive-approximation ADC over other types of ADCs? Successive-approximation ADC has high resolution, low power consumption, and fast conversion speed. How does a successive-approximation ADC work? The successive-approximation ADC works by comparing the input analog signal with a reference voltage using a binary search algorithm. It starts by comparing the input signal with the midpoint of the reference voltage and then divides the reference voltage in half depending on whether the input signal is greater or less than the midpoint. This process is repeated until the digital output is obtained. What is the resolution of a successive-approximation ADC? The resolution of a successive-approximation ADC is determined by the number of bits used in the conversion process. For example, an 8-bit successive-approximation ADC can represent 256 discrete levels. What is the maximum sampling rate of a successive-approximation ADC? The maximum sampling rate of a successive-approximation ADC depends on the clock speed and the number of bits used in the conversion process. What is the advantage of using a capacitor array in a successive-approximation ADC? A capacitor array can be used in a successive-approximation ADC to reduce the conversion time by allowing multiple samples to be taken simultaneously. What are the common applications of successive-approximation ADC? Successive-approximation ADCs are commonly used in digital oscilloscopes, data acquisition systems, medical instruments, and other applications that require high-speed, high-resolution analog-to-digital conversion. What are the limitations of successive-approximation ADC? Successive-approximation ADC has limited accuracy due to its inherent nonlinearity and may require calibration to achieve optimal performance. What are the main components of a successive-approximation ADC? The main components of a successive-approximation ADC include a sample and hold circuit, a comparator, a digital-to-analog converter, and a control logic circuit.

A successive-approximation ADC is a type of analog-to-digital converter that uses a binary search algorithm to convert an analog input signal to a digital output. It typically consists of a sample-and-hold circuit, a digital-to-analog converter (DAC), a comparator, a successive-approximation register (SAR), and a control logic circuit. The conversion process starts with the SAR being initialized to the middle of the ADC's input range. The DAC generates a voltage based on the value in the SAR, which is then compared to the input signal by the comparator. If the DAC output is higher than the input, the SAR's MSB is set to 0, otherwise it's set to 1. This process is repeated for each bit in the SAR until the output is within the desired accuracy. One of the main advantages of a successive-approximation ADC is its high resolution and accuracy, making it suitable for applications such as data acquisition and measurement. It is also a relatively fast ADC, with conversion times typically in the range of microseconds to milliseconds. However, the complexity of the circuitry required to implement a successive-approximation ADC can make it more expensive and power-hungry than other types of ADCs, such as flash or delta-sigma ADCs. Additionally, the conversion time is dependent on the number of bits in the SAR, so higher-resolution ADCs may take longer to complete a conversion.

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