Refer to FIGURE 4.2 below and answer the questions that follow. 4.2.1 Draw a fully labelled output characteristic curve of the n-channel junction field-effect transistor (JFET) for the given transfer characteristic shown in FIGURE 4.2. 4.2.2 On the ANSWER SHEET for QUESTION 4.2, indicate the pinch-off voltage on the output characteristic curve if VGS = -1 V.

NSC Electrical Technology Electronics Waveforms, flowcharts, circuits: Refer to FIGURE 4.2 below and an

Refer to FIGURE 4.2 below and answer the questions that follow - NSC Electrical Technology Electronics - Question 4 - 2022 - Paper 1

Question 4

Refer to FIGURE 4.2 below and answer the questions that follow. 4.2.1 Draw a fully labelled output characteristic curve of the n-channel junction field-effect trans... show full transcript

Worked Solution & Example Answer:Refer to FIGURE 4.2 below and answer the questions that follow - NSC Electrical Technology Electronics - Question 4 - 2022 - Paper 1

Step 1

4.2.1 Draw a fully labelled output characteristic curve of the n-channel junction field-effect transistor (JFET)

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Answer

To draw the output characteristic curve of a n-channel JFET:

Axes Setup: Set up the graph with the vertical axis representing the drain current (ID) in milliamps (mA) and the horizontal axis representing the drain-source voltage (VDS) in volts (V).
Transfer Characteristic Reference: Use the transfer characteristics given in FIGURE 4.2 as a reference. Mark the cutoff point where the drain current begins to rise based on the applied gate-source voltage (VGS).
Curve plotting: Plot the curve starting from the off state until the pinch-off occurs, which is typically at high values of VDS when the JFET enters saturation. Draw the characteristic curves for different values of VGS, including -1 V, -2 V, and so on, highlighting their impacts on ID.
Labeling: Clearly label the curves and any notable points on the graph, especially the saturation region and the pinch-off voltages.

Step 2

4.2.2 On the ANSWER SHEET for QUESTION 4.2, indicate the pinch-off voltage on the output characteristic curve if VGS = -1 V.

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From the curve drawn previously, identify the point at which the drain current (ID) remains constant despite increases in VDS. This flat portion indicates the pinch-off region.

Identify Pinch-off Point: Generally, for VGS = -1 V, the pinch-off voltage will be the value of VDS where ID levels off. This value can vary based on the specific characteristics of the JFET used but should be marked clearly on the output characteristic curve as it illustrates the operational limits of the JFET.
Marking on Graph: Clearly mark this point on the graph utilized in the previous step, and annotate it as the pinch-off voltage for VGS = -1 V.

Refer to FIGURE 4.2 below and answer the questions that follow - NSC Electrical Technology Electronics - Question 4 - 2022 - Paper 1

Worked Solution & Example Answer:Refer to FIGURE 4.2 below and answer the questions that follow - NSC Electrical Technology Electronics - Question 4 - 2022 - Paper 1

4.2.1 Draw a fully labelled output characteristic curve of the n-channel junction field-effect transistor (JFET)

4.2.2 On the ANSWER SHEET for QUESTION 4.2, indicate the pinch-off voltage on the output characteristic curve if VGS = -1 V.

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