(a) The closed-loop gain of a feedback amplifier is
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Microelectronics: Circuit Analysis and Design
- (c) Draw the block diagram and small-signal equivalent circuit diagram of a Shunt-Shunt ideal feedback amplifier. Analyse step by step the feedback amplifier to find the expression of the closed-loop gain, Ar, the input resistance, Rir and the output resistance, Ror in terms of open-loop amplifier gain, A and feedback amplifier gain, B. Identify the type of feedback amplifier.arrow_forward1. Calculate the gain of a negative-feedback amplifier having A = -2000 and B = -1/10. 2. If the gain of an amplifier changes from a value of – 1000 by 10%, calculate the gain change if the amplifier is used in a feedback circuit having B = – 1/20.arrow_forwardQ1/ (a) A negative-feedback amplifier has a closed-loop gain of Af=100 and an open-loop gain of A =5 x 10*. Determine the feedback transfer function p. (b) If p=10.012 and Af = 80, determine the open-loop gain A.arrow_forward
- 1. TRUE OR FALSE . (a) The closed loop gain of a negative feedback amplifier is less than its open loop gain.(b) For a voltage amplifier, the input impedance and output impedance should be very high.(c) For a transconductance amplifier, the input impedance should be very low and the output impedance shouldbe very high.(d) For a voltage amplifier, the output voltage on the load decreases if the output impedance of the amplifierincreases.(e) For a current amplifier, the output current on the load decreases if the output impedance of the amplifierincreases.arrow_forwarda) Design the circuit such that transistor remains in active region. VcC b) Define the type of feedback. Find the feedback circuit. c) Find the open loop gain, A. d) Find the feedback factor, B. RC e) In the closed loop gain, Af. RB OVo f What is the effect of the feedback circuit? What happens if you remove it? Explain briefly. Cc REarrow_forward2. For the Feedback Amplifier circuit shown in Figure 4, determine the following: a. Identify the type of sampling and mixing for the amplifier. b. Calculate the feedback factor for the amplifier. c. Draw the small signal equivalent circuit for the amplifier with no feedback and calculate the voltage gain without any feedback. d. Calculate the voltage gain with feedback. e. Calculate input and output resistances of the amplifier with feedback. B=100; 2=2.5k12. No DC Calculations necessary. +15V IK: Vs look TON't 27k fig. lONf -15V 4. €2.5k ZONE lk $250 Yout F₂0 =20NF lokarrow_forward
- Identify the feedback system topology of the amplifier circuit as shown in Figure 4. Determine: V. the open loop gain, A = Vi i. Vf ii. the feedback gain, B Vo Vo iii. the gain with feedback, Af Vs iv. the expression of A, for Aß » 1 Vdd Rd + R2 Vo Vf R1 +arrow_forward4. The circuit uses current- (or shunt-) feedback bias. The Si transistor has ICEO = 0, VCEsat =0, and B= 100. If RC = 2k and VCC =12V, size RF for ideal maximum symmetrical swing (that is, location of the quiescent point such that VCEQ =VCC/2). +V cc RC Cc Rs RL VL Cc R. Rarrow_forwardExample H.W: If the input impedance and voltage gain of an open loop voltage series feedback amplifier are 3KQ and 100. The feedback factor is % . Find the input impedance of closed loop amplifier.(ANS:9KQ).arrow_forward
- (A) Draw and clearly label the circuit diagram of an op-amp configured as a practical inverting differentiator circuit. (B) For the op-amp in part (A), explain how the DC-offset volatge is reduced at the output? (C) Calculate the feedback resistance Rf and the input reistance R, in a practical diffrentiator if fo =1 kHz and a high-frequency gain of 15 is required. Choose a capacitor of 1µF.arrow_forwardWhat is a typical value of open-loop, low-frequency gain of an op-arop circuit? How does this compare to the ideal value?arrow_forwardA voltage-voltage feedback amplifier employs a basic amplifier with input resistance of 20 MOhms, output resistance of 2kOhms and gain A = 1000. The feedback factor k = 0.1. The closed loop input resistance Rince, and the closed loop output resistance Rociof the closed-loop amplifier are: Rincl= Gand Rout 2arrow_forward
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