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Exercise 1 Op amp has an open loop gain of 2x10 5,input resistance of 2MΩ and output resistance of 50ohm. Find the closed-loop gain (dB) and determine current i when V s =2V (Prepared by: NOR SYUHADA BINTI ZAINUDIN_G.1). Exercise 2 Determine the output voltage of an op-amp for input voltages of V i1 = 250 μV, V i2 = 240 μV. The amplifier has a differential gain of Ad = 4000 and the value of CMRR is : a) 250 b) 10M (Prepared by: ZURINA ABDUL HALIM_G.2)

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2 Find the output voltage of the operational amplifier with the help of the diagram below.Given β is 200,ri=250Ω if op-amp is in the opposite polarity input. (Prepared by: insyirah bt muhamad hamdan_G.1) Exercise 3 +V CC =+14V R C =5kΩ V i1 =6V Vo -V EE =-14V R E =6kΩ Q1Q1 Q2Q2 R C =5kΩ VEVE

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3 Find the output voltage in figure below,where V 1 =1V, V 2 =0.5V, V 3 =0.2V, R 1 =R 2 =R 3 =R f =10kΩ (Prepared by: LAI YOONG YEE_G.4) Exercise 4

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4 Exercise 6 (a)Determine the type of the circuit in figure 1. (b)Draw the AC equivalent circuit of the circuit in figure 1. (c)Prove that differential voltage gain, Ad is given by the expression below: Where V d = V i1 – V i2 and V o = V o1 = V o2. (d) Calculate the output voltage if given V i1 =5V,V i2 =4V, B=150 and r i =15kΩ, R C =5kΩ, R E =3kΩ. (Prepared by: Syamimi binti Mokhtar_G.3)

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5 Exercise 7 Following the circuit calculate the voltage output 1 ( V o1 ) and voltage output 2 (V o2 ). (Prepared by: WAN KHAIRULNAIM B WAN HARON_G.5)

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6 Exercise 8 The output voltage of a certain op-amp appears as shown in figure below in response to a step input. Determine the slew rate (Prepared by: LY GOH_G.2). 0.75µs -8 V out (V) +8 t0

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7 9.1. For a given value of open-loop differential gain, does a higher common-mode gain result in a higher or lower CMRR? Explain. (Prepared by: NOR SYUHADA BINTI ZAINUDIN_G.1). Exercise 9 9.2. What was the characteristic for the inverting amplifier? (Prepared by: ZURINA ABDUL HALIM_G.2) 9.3. Give the modes of input signal: (Prepared by: insyirah bt muhamad hamdan_G.1) 9.4. Briefly explain about inverting amplifier (Prepared by: LAI YOONG YEE_G.4).

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8 9.5. If the input signal not match for the circuit in figure 1,does it function properly? Why? (Prepared by: Syamimi binti Mokhtar_G.3)

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9 Exercise 10 Theory: Calculation: Exercise 10 Theory: A typical op-amp is made up of three types of amplifier circuits. Name the three types of the stage and draw the diagram. Calculation: Refer to Figure where V 1 = 5V, R 1 = 100 kΩ, R f = 500 kΩ and A C = 0.001, calculate: (a) output voltage, Vo (b) common mode rejection ratio, CMRR (c) output voltage if the connection is converted to non-inverting amplifier (Prepared by: Hasrimie b Abdul Hamid_G.10)

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10 Exercise 11 Theory: Calculation: Exercise 11 Theory: Define: (a) Differential Input and (b) Common Input. Calculation: If known that +V cc = +15V R c = 10kΩ, V i1 = 2V, -V EE = - 15V, R E = 8kΩ and V i2 = 0V, find the output voltage V o1. (Prepared by: Mohamad Aizat_G.10)

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11 Exercise 12 Theory: Calculation: Exercise 12 Theory: State 3 differences between Ideal Op-Amp and Practical Op-Amp? Calculation: Find the values of the input and output impedances in figure 1.Also,determine the closed-loop voltage gain. The op-amp has the following parameters: A ol = 50 000; Z in = 4 M Ohm, Z out = 50 Ohm. (Prepared by: Siti Haslinda bt Zainall Abidin _G.8)

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12 Exercise 13 Theory: Calculation: Exercise 13 Theory: List the amplifier class in a typical op-amp? Calculation: Calculate the output voltage of a non-inverting amplifier as figure below, for values of V 1 = 2 V, R f = 500 kΩ and R 1 = 100 kΩ. (Prepared by: Bong Soon Wai_G.8)

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13 Exercise 14 Theory: Calculation: Exercise 14 Theory: Define common-mode rejection? Calculation: Given the op-amp configuration in figure 1, determine the value of required to produce a closed- loop of voltage gain of 12. (Prepared by: Lee Kar Leong _G.8)

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14 Exercise 15 Theory: Calculation: Exercise 15 Theory: Briefly explain about the operation of differential mode? Calculation: Refer to Figure, determine the approximate values for each of the following quantities: I in, I f, V out and closed loop gain if given R 1 =2.2 KΩ,R f =22 KΩ, and V in =1V (Prepared by: Kalidhass A/L Vengdasalam_G.6)

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15 Exercise 16 Theory: Calculation: Exercise 16 Theory: Why DC power supply is used in operational amplifier circuits? Calculation: An ideal op amp is shown in Figure. Op amp has an open loop gain of 2 x 10 5, input resistance of 2 MΩ and output resistance of 50 Ω. (a) Draw the equivalent circuit of circuit in Figure 1 (b) Find the closed-loop gain (dB) (c) Determine current i when V s = 2 V (Prepared by Sarveshvaran A/L Suppiah_G.6)

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16 Exercise 17 Theory: Exercise 17 Theory: There a three operations can be done in a differential amplifier circuits : i) DC Bias ii) AC Operation Calculation: Given: V CC = +9V, V EE = -9V, R C = 3.9 kΩ and R E = 3.3 kΩ. Calculate the DC voltages. (Prepared by Syamsuri B Hamzah_G.5) Describe iii) Common Mode Operation about AC Operation and Common Mode Operation and draw the figure of each amplifier circuit.

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17 Exercise 18 Theory: Calculation: Exercise 18 Theory: State the reason why the additional resistor (R f ) are used in a practical integrator. Calculation: This Figure shows a Summing Amplifier with the following data: V 1 = 8v,R 1 = 650KΩ V 2 = -4v,R 2 = 480KΩ V 3 = 2v,R 3 = 700KΩ R f = 1.5MΩ Calculate the output voltage (V o ) of the amplifier. (Prepared by: MOHD AZRUL BIN AHMAD _G.5)

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18 lucky students The names listed below are the lucky students because having a chance to finish the prepared questions: 1.Syamsul Arif_G.10 (Exc. 10) 2.Zulfahmi_G.10 (Exc. 11) 3.Majidah bt Mohd Zani Piyas_G.8 (Exc. 12) 4.Jason Wu Chee San_G.8 (Exc. 13) 5.Aaron Koay Terr Yeow_G.8 (Exc. 14) 6.Dasarathan A/L Rajan Theren_G.6 (Exc. 15) 7.Anis shafika bt Mohd Zaini_G.6 (Exc.16) 8.Loh Yang Tee_G.5 (Exc. 17) 9.Syamsuri B Hamzah_G.5 (Exc. 18)

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Unit 8 Operational Amplifier. Objectives: Ideal versus practical operational amplifier Performance parameters Some applications –Peak detector –Absolute.

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