Consider the series-shunt feedback amplifier of Figure below. Assume that the voltage divider (R1, R2) is implemented with a 1-MN potentiometer. Assume that the MOSFET is Vpp biased so that gm = 4 mA/V and r, is large. Also, Rp = 10 kn. Find the value of R1 that results in a closed-loop gain of 5 V/V. Rp R2
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- Given in the figure is a two-stage amplifier design that employs negative feedback. Answer the following questions. Use the notation (R1 + R2 + ... + Rn) for series resistors and (R1 || R2 || ... || Rn) for parallel resistors for clarity and ease. Assume that the transistors are already biased properly in the saturation region and ro1 = ro2 → ∞. Also assume that the capacitors have infinite capacitance. 1.) Find the expression for the open loop gain Av 2.) Derive the resistance Rin which is the resistance that can be seen at the input port of the amplifierCompare the closed-loop voltage gain, k = Vo/Vs, for the loaded and unloaded dependent source model of the Voltage Follower with the ideal model of the Voltage to examine the impact of the load, RL on k. - Using any circuit analysis method, derive expressions for the closed-loop gain, k = Vo/Vs, for the ideal opamp Voltage Follower ,both the unloaded ,loaded Voltage Follower using the dependent source model. simplify both of the closed-loop gain expressions for the dependent source models by applying the ideal opamp parameters: A --> infinity , R_i -->infinity and R_0 --> infinity.Compare inverting and non-inverting amplifier. Also, calculate the closed-loop gain of the circuit diagram given below
- An amplifier has an open-loop gain of 92 dB, Rid = 75 kΩ, and Ro = 1400Ω. The amplifier is used in a feedback amplifier configuration with a resistive feedback network. (a) What is the largest value of current gain that can be achieved with this feedback amplifier? (b) What is the largest valuetransconductance that can be achieved with this feedback amplifier?Question 3: Please write answers to all parts of the question in the separate dot points as shown What is the circuit called? Discuss all components including voltage sources. Which components determine the closed-loop gain of the circuit? Describe the slew-rate of the op-amp. Describe the Common-Mode-Rejection ratio of the op-amp? What is the unity gain bandwidth? Describe the gain bandwidth product (GBP). Describe the GBP relationship between the break (critical) frequency and the gain? What two methods calculate the max frequency? If one produces a higher value of maximum frequency than the other, which would you use as the maximum frequency?For the feedback amplifier circuit shown below, assuming the internal resistor in each MOSFETs is infinite ( ro = ∞ ) and gm1 = gm2 = gm2 = 2.5mA/V. a) Draw the small AC equivalent circuit of the below amplifier. b) Determine the overall voltage gain.
- Assume for a moment that perfectly accurate resistors were available for feedback networks; that is resistor tolerance is 0%. Then any deviation from the value set by the feedback resistor ratio is caused by insufficient raw op-amp gain. What minimum raw gain would be needed to get within 1% if an intended overall gain of 10? What if the intended gain is 100 instead?Consider the following statement: In feedback amplifiers, concerning the connections between the direct amplifiers and the feedbacks network, a shunt connectiın at the input part servers to set an increased versiın of the input impedance of the direct amplifier, whereas again a shunt connection at the output part services to set a decreased version of the output imdepance of direct amplifier. Explain what is wrong with the statement above by drawing representative circuit diagrams and outlining the necessary calculations.2. Design a unity gain inverting summing amplifier that will output the sum of two input voltages. Use a feedback resistor of 2.5 Kohms.
- a. What is the value of Vout? b. What is the voltage gain? c. If the input is connected to the non-inverting input along with the feedback, what now is the value of the output voltage? d. If the input is connected to the non-inverting input along with the feedback, what now is the value of the output voltage? e. If greater voltage gain is a requirement, which set-up is a better choice?An amplifier has an open-loop voltage gain of 90 dB, Rid = 50 kΩ, and Ro = 5000 Ω. The amplifier is used in a feedback configuration with a resistive feedback network. (a) What is the largest current gain that can be achieved with this feedback amplifier? (b) What is the largest transconductance that can be achieved with this feedback amplifier?2-) The AC equivalent of a feedback amplifier circuit is given in the figure on the right. (Hfe100, Va = ∞, Ic1 = 15 mA, Ic2 = 5mA and Ic3 = 5 mA) a) State the type of feedback used in the circuit, explaining the reason. b) Draw the small signal equivalent of the amplifier circuit. c) Calculate the value of β for the feedback by drawing the β circuit. d) Find the Avf = Vo / Vs closed loop gain of this circuit. e) Find the Rif and Rof values.