55493 – ASSIGNMENT 2SEE216 ANALOGUE AND DIGITAL ELECTRONICSUnit

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ASSIGNMENT 2SEE216 ANALOGUE AND DIGITAL ELECTRONICSUnit Chair: Ronny KutadinataQUESTION 1Consider the JFET circuit in Figure 1. The JFET has ???????? = 8 ???? and ??????(??????) = -7 ??.Figure 1: JFET self-bias circuitCompute the Q-point of the circuit (?????? and ????????). [8 marks]QUESTION 2You are attempting to implement a NOR gate by using the BJT circuit shown in Figure 2. Note that the two BJTs are identical.Figure 2: NOR gate implementationThere are two operational requirements that you need to achieve:• The required output voltage thresholds are: ?????? = 2.4 and ?????? = 0.4.• The current load at the base cannot exceed a certain value, i.e. ???? = ????(??????) = 100 ????.Given that:• ??????(??????) = 0.2 ??,• ?????? = 50,• the input voltage (for both inputs at A and B) is ?????? = 1.5 ?? for HIGH level and ?????? = 0 ?? for LOW level, choose the values for ???? and ???? from the list of standardised resistor values in Table 3 (Appendix A) to satisfy the operational requirements of the NOR gate. In your workings, clearly show that the chosen resistor values will be able to satisfy the operational requirements for each case (i.e. each row) presented in the truth table in Table 1 below. [12 marks]Table 1: NOR truth tableA B FLOW LOW HIGHLOW HIGH LOWHIGH LOW LOWHIGH HIGH LOWExample: When we consider the first row of Table 1, we have ???? = ???? = 0 ?? = ??????. Thus, you have to show that ???????? 2.4 ?? = ??????. Similarly, when we consider the second row of Table 1, you have to show that???????? 0.4 ?? = ?????? given that ???? = 0 ?? and ???? = 1.5 ?? = ??????.Hint no.1: The output voltage thresholds are the upperlower bounds for the voltage value, meaning the actual value of the output voltage can be lower (for LOW output) or higher (for HIGH output) than the corresponding threshold values.Hint no.2: Operate the BJTs either at cut-off or saturation.QUESTION 3Consider the common emitter small signal amplifier in Figure 3.Figure 3: Common emitter small signal amplifierYou are attempting to design the amplifier to satisfy some pre-specified operational requirements. The operational requirements and the given parameters are shown in Table 2. Please use the dataset corresponding to the last digit of your student ID number.Example: If your student ID number is 463184250, then please use Dataset 0. If your student ID number is 123456789, then please use Dataset 9.Table 2: Datasets of the operational requirements and the given parameters.Dataset no. 0 1 2 3 4 5 6 7 8 9Given parameters?????? [??] 8 14 15 15 15 12 9 9 11 9?????? 90 90 100 150 80 80 150 120 150 140?????? 50 100 50 90 90 90 60 100 60 90???? [??] 10 70 80 10 50 30 90 70 30 40???? [????] 10 7 8 7 7 9 9 8 7 9?????? [????] 30 30 5 5 25 15 15 25 20 10?????? [????] 5 15 5 5 10 5 5 10 20 5Operating requirements???????? [??] 0.5 ?????? ± 0.5Min operating freq. range [??????] 4 1 2 2 2 4 5 3 1 3Max operating freq. range [??????] 6 3 5 6 4 7 7 4 2 6Your task is to choose the values for ??1, ??2, ????, ????1, ????2, ??1, ??2, and ??3 such that the operating requirements are satisfied. The values of the resistors and capacitors have to be selected from the list of standardised values shown in Table 3 (Appendix A) and Table 4 (Appendix B), respectively.Once you have selected the resistor and capacitor values, please do the following to demonstrate that you have achieved the operating requirements.A. Using the Thevenin method, compute the Q-point (?????? and ????????). [4 marks]B. Compute the overall AC voltage gain [6 marks]C. Compute the three lower cut-off frequencies. [5 marks]D. Compute the two upper cut-off frequencies. [5 marks]Hint no.1: The operating frequency range are thresholds, meaning that you have satisfied the requirement as long as this range is fully contained within the passband of the amplifier.Hint no.2: Choosing the values for the resistors and capacitors can be done via trial-and-error. But, try to think of a faster way to do the trial-and-error! ?Hint no.3: You can remove ????1 if need be.Optional challenge no.1: Besides meeting the operating requirements, try to maximise the voltage gain!Optional challenge no.2: Try to achieve a passband that is as close as possible to the operating frequency range!APPENDIX A RESISTOR VALUESTable 3: Standardised resistor values.O kO10 100 1.0 10 10011 110 1.1 11 11012 120 1.2 12 12013 130 1.3 13 13015 150 1.5 15 15016 160 1.6 16 16018 180 1.8 18 18020 200 2.0 20 20022 220 2.2 22 22024 240 2.4 24 24027 270 2.7 27 27030 300 3.0 30 30033 330 3.3 33 33036 360 3.6 36 36039 390 3.9 39 39043 430 4.3 43 43047 470 4.7 47 47051 510 5.1 51 51056 560 5.6 56 56062 620 6.2 62 62068 680 6.8 68 68075 750 7.5 75 75082 820 8.2 82 82091 910 9.1 91 910APPENDIX B CAPACITOR VALUESTable 4: Standardised capacitor values.pF µF1.0 10 100 1000 0.01 0.1 1.0 10 100 10001.1 11 110 11001.2 12 120 12001.3 13 130 13001.5 15 150 1500 0.015 0.15 1.5 15 150 15001.6 16 160 16001.8 18 180 18002.0 20 200 20002.2 22 220 2200 0.022 0.22 2.2 22 220 22002.4 24 240 24002.7 27 270 27003.0 30 300 30003.3 33 330 3300 0.033 0.33 3.3 33 330 33003.6 36 360 36003.9 39 390 39004.3 43 430 43004.7 47 470 4700 0.047 0.47 4.7 47 470 47005.1 51 510 51005.6 56 560 56006.2 62 620 62006.8 68 680 6800 0.068 0.68 6.8 68 680 68007.5 75 750 75008.2 82 820 82009.1 91 910 9100

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