Subelement A: RADAR Principles – 10 Key Topics – 10 Exam Questions – 8 Drawings— Topic 7: Components-1
Question 8-7A2
Element 8 (RADAR)A basic sample-and-hold circuit contains:
Explanation
A sample-and-hold circuit accurately captures an instantaneous analog voltage and stores it for a period.
The core components are:
1. **Analog Switch:** To "sample" the input voltage by momentarily connecting it to the storage element.
2. **Capacitor:** To "hold" the sampled voltage as a charge.
3. **Input Buffer (Amplifier):** An op-amp voltage follower at the input ensures the capacitor charges quickly and accurately without loading the input signal source.
4. **Output Buffer (Amplifier):** Another op-amp voltage follower at the output provides a low-impedance output and prevents the load from discharging the capacitor, maintaining the held voltage.
Option D correctly identifies all these essential components for a functional and practical basic sample-and-hold circuit. Options A, B, and C are incomplete, missing critical elements like the capacitor for storage or the necessary input/output buffers for proper operation and isolation.
Related Questions
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