Which of the following is a type of analog-to-digital conversion?
The correct answer is A: Successive approximation. Successive approximation is a type of analog-to-digital conversion (ADC). In successive approximation ADCs, the converter compares the input voltage to a series of reference voltages, successively refining the digital output until it matches the input.
Successive approximation ADCs work by starting with the most significant bit (MSB) and working down. They compare the input to a reference, set the bit if the input is larger, then move to the next bit. This process continues until all bits are determined. Successive approximation ADCs provide a good balance of speed and accuracy and are commonly used in medium-speed applications. They're faster than integrating ADCs but slower than flash ADCs.
Exam Tip
ADC type = Successive approximation. Remember: Successive approximation is a type of analog-to-digital conversion that compares input to references bit by bit.
Memory Aid
"**A**DC **T**ype = **S**uccessive **A**pproximation (think 'AT = SA')"
Real-World Application
Your software-defined radio uses a successive approximation ADC to convert received RF signals to digital. The ADC compares the input voltage to reference voltages, setting each bit in sequence from most significant to least significant. This provides good accuracy and reasonable speed for SDR applications.
FCC Part 97.3Key Concepts
Why Other Options Are Wrong
Option B: Incorrect. Harmonic regeneration is not an ADC method. It's related to signal processing, not analog-to-digital conversion.
Option C: Incorrect. Level shifting is a signal conditioning technique, not an ADC conversion method.
Option D: Incorrect. Phase reversal is a modulation technique, not an ADC method.
题目解析
The correct answer is A: Successive approximation. Successive approximation is a type of analog-to-digital conversion (ADC). In successive approximation ADCs, the converter compares the input voltage to a series of reference voltages, successively refining the digital output until it matches the input. Successive approximation ADCs work by starting with the most significant bit (MSB) and working down. They compare the input to a reference, set the bit if the input is larger, then move to the next bit. This process continues until all bits are determined. Successive approximation ADCs provide a good balance of speed and accuracy and are commonly used in medium-speed applications. They're faster than integrating ADCs but slower than flash ADCs.
考试技巧
ADC type = Successive approximation. Remember: Successive approximation is a type of analog-to-digital conversion that compares input to references bit by bit.
记忆口诀
**A**DC **T**ype = **S**uccessive **A**pproximation (think 'AT = SA')
实际应用示例
Your software-defined radio uses a successive approximation ADC to convert received RF signals to digital. The ADC compares the input voltage to reference voltages, setting each bit in sequence from most significant to least significant. This provides good accuracy and reasonable speed for SDR applications.
错误选项分析
Option B: Incorrect. Harmonic regeneration is not an ADC method. It's related to signal processing, not analog-to-digital conversion. Option C: Incorrect. Level shifting is a signal conditioning technique, not an ADC conversion method. Option D: Incorrect. Phase reversal is a modulation technique, not an ADC method.
知识点
Analog-to-digital conversion, Successive approximation, ADC, Digital conversion
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.