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Refer to FIGURE 4.9 below and answer the questions that follow - NSC Electrical Technology Electronics - Question 4 - 2018 - Paper 1
Question 4
Refer to FIGURE 4.9 below and answer the questions that follow. FIGURE 4.9: OP AMP AS INTEGRATOR 4.1 Draw the output signal in ANSWER SHEET 4.1 when the input sign... show full transcript
Worked Solution & Example Answer:Refer to FIGURE 4.9 below and answer the questions that follow - NSC Electrical Technology Electronics - Question 4 - 2018 - Paper 1
Step 1
4.1 Draw the output signal in ANSWER SHEET 4.1 when the input signal in FIGURE 4.8 is supplied.
Answer
The output signal will be a time-integrated version of the input signal from FIGURE 4.8. For the sine wave input, the output will be a triangular waveform, as the integration of a sine wave produces a negative and positive ramp corresponding to the input peaks. Hence, for a sine wave of amplitude Vo, the output will oscillate linearly, reaching maximum and minimum voltage levels corresponding to the area under the sine wave curve over half periods.
Step 2
4.2 Describe what will happen to the output signal if the RC time constant is short.
Answer
If the RC time constant is short, the capacitor will charge rapidly, causing the output to respond more quickly to changes in the input signal. In this case, the output may approximate the input signal closely, leading to less distortion. However, if the RC time constant is too short relative to the input frequency, it can also lead to a situation where the output waveform starts clipping, preventing it from following the input accurately and resulting in distorted square waves.