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Question 4 4.1 4.2 A JFET transfer or transconductance curve involves the plot of which two variables? For the particular JFET in Figure 4.2, $I_D = 1mA$. Find $V_{DS}$ and $V_{GS}$? 4.3 4.4 Page 3 of 6 (20 marks) [1] [4] What is the purpose of an Op-Amp in an active filter? Draw a well-labelled Gain Vs frequency response of the following active filters: (a) Low-Pass Filter (b) High-Pass Filter (c) Band-Pass Filter (d) Band-Stop Filter [2] [4] 4.5.1 What is the name of the filter configuration shown in Figure 4.5? 4.5.2 What is the centre frequency of the filter configuration in Figure 4.5? 4.5.3 Optimise the filter configuration for a Q value of 50 in Figure 4.5. Question 5 5.1 5.2 [2] [3] [4] (20 marks) Name the two functions performed by the feedback block of a sinusoidal circuit. Use Figure 5.2 to answer the following questions: [2] 5.2.1 Determine the frequency for the oscillator in Figure 5.2. Assume there is [4] negligible loading on the feedback circuit and that its Q is greater than 10. 5.2.2 Find the frequency if the oscillator in Figure 5.2 is loaded to a point where the [2] 3

          Question 4
4.1
4.2
A JFET transfer or transconductance curve involves the plot of which two
variables?
For the particular JFET in Figure 4.2,
$I_D = 1mA$. Find $V_{DS}$ and $V_{GS}$?
4.3
4.4
Page 3 of 6
(20 marks)
[1]
[4]
What is the purpose of an Op-Amp in an active filter?
Draw a well-labelled Gain Vs frequency response of the following active filters:
(a) Low-Pass Filter
(b) High-Pass Filter
(c) Band-Pass Filter
(d) Band-Stop Filter
[2]
[4]
4.5.1 What is the name of the filter configuration shown in Figure 4.5?
4.5.2 What is the centre frequency of the filter configuration in Figure 4.5?
4.5.3 Optimise the filter configuration for a Q value of 50 in Figure 4.5.
Question 5
5.1
5.2
[2]
[3]
[4]
(20 marks)
Name the two functions performed by the feedback block of a sinusoidal circuit.
Use Figure 5.2 to answer the following questions:
[2]
5.2.1 Determine the frequency for the oscillator in Figure 5.2. Assume there is [4]
negligible loading on the feedback circuit and that its Q is greater than 10.
5.2.2 Find the frequency if the oscillator in Figure 5.2 is loaded to a point where the
[2]
3

Question 4
4.1
4.2
A JFET transfer or transconductance curve involves the plot of which two
variables?
For the particular JFET in Figure 4.2,
ID = 1mA. Find VDS and VGS?
4.3
4.4
Page 3 of 6
(20 marks)
[1]
[4]
What is the purpose of an Op-Amp in an active filter?
Draw a well-labelled Gain Vs frequency response of the following active filters:
(a) Low-Pass Filter
(b) High-Pass Filter
(c) Band-Pass Filter
(d) Band-Stop Filter
[2]
[4]
4.5.1 What is the name of the filter configuration shown in Figure 4.5?
4.5.2 What is the centre frequency of the filter configuration in Figure 4.5?
4.5.3 Optimise the filter configuration for a Q value of 50 in Figure 4.5.
Question 5
5.1
5.2
[2]
[3]
[4]
(20 marks)
Name the two functions performed by the feedback block of a sinusoidal circuit.
Use Figure 5.2 to answer the following questions:
[2]
5.2.1 Determine the frequency for the oscillator in Figure 5.2. Assume there is [4]
negligible loading on the feedback circuit and that its Q is greater than 10.
5.2.2 Find the frequency if the oscillator in Figure 5.2 is loaded to a point where the
[2]
3

Added by Brian J.

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