Given an ideal op amp to implement designs for the following closed - loops gains, what values of reistors ( R 1 , R 2 ) should be used ? Where possible, used at least one 1 0 kohm resistor (a) +1V/V
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Using the LM741 operational amplifier to build a voltage feedback amplifier shown in Fig. 1 with a closed-loop gain of |Af| = 50 V/V ± 20%. The small-signal model characteristics for the op-amp are: open-loop gain Avo = 200V/mV, ri = 2 MΩ, ro = 75 Ω, and open-loop Bandwidth BW = 5Hz. Figure 1 Voltage feedback amplifier Steps: 1. Complete your design by selecting appropriate R1 and R2 (please consider the resistors that are available as stated on page 1). Q1: What are the values of R1 and R2 in the circuit you designed? Please include key steps of deciding the values of R1 and R2. Hint: You may consider simplify your design by considering the op-amp to be ideal (i.e., infinite open loop gain, infinite internal input resistance Ri and zero internal output resistance Ro). In this case, you can apply the characteristics of ideal op-amp to simplify the calculation. Note: The design method in Hint is an approximate method. It might lead to some inaccuracy. Normally, the inaccuracy in very small for op-amp feedback amplifier circuits.
Adi S.
D 2.22 (a) Design an inverting amplifier with a closed-loop gain of -200 V/V and an input resistance of 1 kΩ. (b) If the op amp is known to have an open-loop gain of 5000 V/V, what do you expect the closed-loop gain of your circuit to be (assuming the resistors have precise values)? (c) Give the value of a resistor you can place in parallel (shunt) with R1 to restore the closed-loop gain to its nominal value. Use the closest standard 1% resistor value (see Appendix J). (d) Alternatively, give the closest standard resistor value that may be connected in series with R2 to restore the closed-loop gain to its ideal value.
Madhur L.
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