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Design a feedback current amplifier to provide a current gain of 15. The nominal current source resistance is
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Microelectronics: Circuit Analysis and Design
- 1. Design an inverting-summing amplifier using a 120 kΩ resistor in the feedback path so that vo=-(8va+5vb+12vc). Use ±15 V power supplies. 2.Suppose va=2 V and vc=-1 V. What range of values for vb will keep the op amp in its linear operating region?arrow_forwardDesign an inverting summing amplifier using a 120 kohm resistor in the feedback path so that vo= -(8va+5vb+12vc) use +- 15 V power supplies. Suppose va= 2V and vc= -1 V. What range of values for vb will keep the op amp in it's linear operating region?arrow_forwardA single-pole op amp has an open-loop gain of 95 dB and a unity-gain frequency of 2 MHz. (a) The op amp is used to build an inverting amplifier with an ideal gain of 20 dB. What is the amplifier’s phase margin? (b) Repeat for an ideal gain of 46 dB.arrow_forward
- 1. The virtual short is applicable A. If one of the input is tied to the ground B. Only if there is a feedback C. All the time D. Depending on the components used 2. What ideal characteristic of Op-Amp contributes to the Virtual Short concept? A. Zero Ohm Input Resistance B. Zero Ohm Output Resistance C. Input terminals do not let current to flow D. Infinite gain 3. Op-amp closed loop gain varies A. True B. Depending on the resistor values used C. Not applicable D. Falsearrow_forward3. For the circuit below, find the following: 3.1 Find Vo in terms of Va and Vb 3.2 If Va = 5V and Vb= -4V, find Vo. 3.3 Sketch Vo as a function of Va (Vo vs. Va) when the power supplies on the op- amp are ±12V and Vb = 4V. Clearly mark the two intercepts and the saturation points, if any. 3.4 If the power supplies on the op-amp are ±12V and Vb = 4V, what is the range of Va that allows the op-amp to have a linear output? (Hint: refer to the graph you drew in part 3.3)arrow_forwardThe feedback amplifier in Figure 1 has Rs = 20kΩ, R1 = 10kΩ, R2 = 100kΩ, R3 = 100kΩ and RL = 10kΩ. Ituses an operational amplifier with the following parameters:• Open-loop gain a = 100,000 V/V• Input resistance ri = 200kΩ• Output resistance ro = 100Ω Find the following closed-loop parameters of the circuit, taking into account the loading effects of the sourceresistance, the load resistance and the feedback network:(a) Feedback factor ƒ(b) Voltage gain Avƒ = vL /vs(c) Input resistance Rinƒ(d) Output resistance Routƒarrow_forward
- Compute the Current Gain (Gi=iL/is) by applying the ideal op-amp model by taking A → ∞, Ri → ∞, and Ro → 0) where RL = 31 and RS=117.arrow_forwardAn op-amp with an open-loop gain of 3x106 and Vcc = 12 V has an inverting-input voltage of 6.7 microVolts and a non-inverting input voltage of 5.4 microVolts. What is its output voltage? Be sure to round your answer to the nearest single digital decimal place. Do not enter units. As an example, if you calculate 7.39 Volts then enter 7.4 as your submitted answerarrow_forwardA non-inverting op-amp circuit has the open loop gain of 136 and the resistances R1=3500 Ω and R2 = 3.8 kΩ . Calculate (a) The actual value of voltage gain (b) Considering the finite open loop gain, the ideal value of gain (c) Error, when ideal voltage gain is compared with actual voltage gain (d) The percentage error, when ideal voltage gain is compared with actual voltage gain. (a) The actual value of voltage gain Answer for part 1 (b) The ideal value of voltage gain Answer for part 2 (c) Error, when ideal voltage gain is compared with actual voltage gain. Answer for part 3 (d) The percentage error, when ideal voltage gain is compared with actual voltage gain.arrow_forward
- Four identical integrators from are cascaded to form an oscillator. (a) Draw the circuit. (b) What is the frequency of oscillation ifR = 10 k, C = 100 pF, if the op amps have anopen-loop gain of 100 dB and a unity-gain frequency of 750 kHzarrow_forwardAssume that Op-Amp as shown above is ideal. Given that R1 is 0.29 Ohm, R2 is 1.7 Ohm, R3 is 2.03 Ohm, R4 is 2.125 Ohm. Calculate Vo?arrow_forwardWhat is the cut–off frequency of an op-amp if the unity-gain frequency is 2.8 MHz and the open-loop gain is 200,000? Show the details of your work. Write your solution on a white typewriting paper, scan it in JPEG format and upload it to the space provided below.arrow_forward
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