Microelectronics: Circuit Analysis and Design
4th Edition
ISBN: 9780073380643
Author: Donald A. Neamen
Publisher: McGraw-Hill Companies, The
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Question
Chapter 12, Problem 12.18EP
To determine
The value of feedback factor at which an amplifier with given closed-loop transfer function becomes unstable.
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2) The amplifier circuit shown below has the following parameters: Rid = 200k, ro = 2k2, an open
loop gain = μ = 106. If the factor 1+Aßf) = 15.
a) State the type of feedback topology circuit.
b) Identify the feedback portion of the circuit.
c) Determine R₁1 and R22.
d) Draw the small AC equivalent circuit of the below amplifier.
e) Determine Aƒ.
f) Determine Rif and Rof.
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a. Av, B, Avf (including the units)
b. Rif, Rof if Ri= 5 Kohm & Ro = 4 Kohm.
The feedback signal of the following system is, Z(s)=.
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Maintenance will extend the
Chapter 12 Solutions
Microelectronics: Circuit Analysis and Design
Ch. 12 - (a) The open-loop gain of an amplifier is A=5104...Ch. 12 - (a) Consider a general feedback system with...Ch. 12 - (a) A feedback amplifier has an open-loop...Ch. 12 - (a) Consider the circuit shown in Figure...Ch. 12 - (a) The closed-loop gain of a feedback amplifier...Ch. 12 - The gain factors in a feedback system are A=5105...Ch. 12 - Prob. 12.3TYUCh. 12 - An ideal series-shunt feedback amplifier is shown...Ch. 12 - Consider the ideal shunt-series feedback amplifier...Ch. 12 - An ideal series-series feedback amplifier is shown...
Ch. 12 - Prob. 12.5TYUCh. 12 - Consider the noninverting op-amp circuit shown in...Ch. 12 - Design a feedback voltage amplifier to provide a...Ch. 12 - Prob. 12.6TYUCh. 12 - (a) Assume the transistor in the source-follower...Ch. 12 - Consider the common-base circuit in Figure...Ch. 12 - Design a feedback current amplifier to provide a...Ch. 12 - Prob. 12.8TYUCh. 12 - Prob. 12.9TYUCh. 12 - For the circuit in Figure 12.31, the transistor...Ch. 12 - Design a transconductance feedback amplifier with...Ch. 12 - Prob. 12.10TYUCh. 12 - Consider the circuit in Figure 12.39, with...Ch. 12 - Consider the BJT feedback circuit in Figure...Ch. 12 - Prob. 12.12TYUCh. 12 - Consider the circuit in Figure...Ch. 12 - Prob. 12.16EPCh. 12 - Prob. 12.17EPCh. 12 - Consider the circuit in Figure 12.44(a) with...Ch. 12 - Consider the circuit in Figure 12.16 with the...Ch. 12 - Prob. 12.18EPCh. 12 - Consider the loop gain function T(f)=(3000)(1+jf...Ch. 12 - Consider the loop gain function given in Exercise...Ch. 12 - Prob. 12.16TYUCh. 12 - Prob. 12.17TYUCh. 12 - Prob. 12.20EPCh. 12 - Prob. 12.21EPCh. 12 - Prob. 12.22EPCh. 12 - What are the two general types of feedback and...Ch. 12 - Prob. 2RQCh. 12 - Prob. 3RQCh. 12 - Prob. 4RQCh. 12 - Prob. 5RQCh. 12 - Prob. 6RQCh. 12 - Describe the series and shunt output connections...Ch. 12 - Describe the effect of a series or shunt input...Ch. 12 - Describe the effect of a series or shunt output...Ch. 12 - Consider a noninverting op-amp circuit. Describe...Ch. 12 - Prob. 11RQCh. 12 - What is the Nyquist stability criterion for a...Ch. 12 - Using Bode plots, describe the conditions of...Ch. 12 - Prob. 14RQCh. 12 - Prob. 15RQCh. 12 - Prob. 16RQCh. 12 - Prob. 17RQCh. 12 - (a) A negative-feedback amplifier has a...Ch. 12 - Prob. 12.2PCh. 12 - The ideal feedback transfer function is given by...Ch. 12 - Prob. 12.4PCh. 12 - Consider the feedback system shown in Figure 12.1...Ch. 12 - The open-loop gain of an amplifier is A=5104. If...Ch. 12 - Two feedback configurations are shown in Figures...Ch. 12 - Three voltage amplifiers are in cascade as shown...Ch. 12 - (a) The open-loop low-frequency voltage gain of an...Ch. 12 - (a) Determine the closed-loop bandwidth of a...Ch. 12 - (a) An inverting amplifier uses an op-amp with an...Ch. 12 - The basic amplifier in a feedback configuration...Ch. 12 - Consider the two feedback networks shown in...Ch. 12 - Prob. 12.14PCh. 12 - Two feedback configurations are shown in Figures...Ch. 12 - Prob. 12.16PCh. 12 - The parameters of the ideal series-shunt circuit...Ch. 12 - For the noninverting op-amp circuit in Figure...Ch. 12 - Consider the noninverting op-amp circuit in Figure...Ch. 12 - The circuit parameters of the ideal shunt-series...Ch. 12 - Consider the ideal shunt-series amplifier shown in...Ch. 12 - Consider the op-amp circuit in Figure P12.22. The...Ch. 12 - An op-amp circuit is shown in Figure P12.22. Its...Ch. 12 - Prob. 12.24PCh. 12 - Prob. 12.25PCh. 12 - Consider the circuit in Figure P12.26. The input...Ch. 12 - The circuit shown in Figure P12.26 has the same...Ch. 12 - The circuit parameters of the ideal shunt-shunt...Ch. 12 - Prob. 12.29PCh. 12 - Consider the current-to-voltage converter circuit...Ch. 12 - Prob. 12.31PCh. 12 - Determine the type of feedback configuration that...Ch. 12 - Prob. 12.33PCh. 12 - A compound transconductance amplifier is to be...Ch. 12 - The parameters of the op-amp in the circuit shown...Ch. 12 - Prob. 12.36PCh. 12 - Consider the series-shunt feedback circuit in...Ch. 12 - The circuit shown in Figure P12.38 is an ac...Ch. 12 - Prob. 12.39PCh. 12 - Prob. 12.40PCh. 12 - Prob. 12.41PCh. 12 - Prob. 12.42PCh. 12 - Prob. D12.43PCh. 12 - Prob. D12.44PCh. 12 - An op-amp current gain amplifier is shown in...Ch. 12 - Prob. 12.46PCh. 12 - Prob. 12.47PCh. 12 - Prob. 12.48PCh. 12 - The circuit in Figure P 12.49 has transistor...Ch. 12 - (a) Using the small-signal equivalent circuit in...Ch. 12 - The circuit in Figure P12.51 is an example of a...Ch. 12 - Prob. 12.52PCh. 12 - For the transistors in the circuit in Figure P...Ch. 12 - Consider the transconductance amplifier shown in...Ch. 12 - Consider the transconductance feedback amplifier...Ch. 12 - Prob. 12.57PCh. 12 - Prob. D12.58PCh. 12 - Prob. 12.59PCh. 12 - Prob. D12.60PCh. 12 - Prob. 12.61PCh. 12 - The transistor parameters for the circuit shown in...Ch. 12 - Prob. 12.63PCh. 12 - For the circuit in Figure P 12.64, the transistor...Ch. 12 - Prob. 12.65PCh. 12 - Prob. 12.66PCh. 12 - Design a feedback transresistance amplifier using...Ch. 12 - Prob. 12.68PCh. 12 - Prob. 12.69PCh. 12 - Prob. 12.70PCh. 12 - The transistor parameters for the circuit shown in...Ch. 12 - Prob. 12.72PCh. 12 - The open-loop voltage gain of an amplifier is...Ch. 12 - A loop gain function is given by T(f)=( 103)(1+jf...Ch. 12 - A three-pole feedback amplifier has a loop gain...Ch. 12 - A three-pole feedback amplifier has a loop gain...Ch. 12 - A feedback system has an amplifier with a...Ch. 12 - Prob. 12.78PCh. 12 - Prob. 12.79PCh. 12 - Consider a feedback amplifier for which the...Ch. 12 - Prob. 12.81PCh. 12 - A feedback amplifier has a low-frequency open-loop...Ch. 12 - Prob. 12.83PCh. 12 - A loop gain function is given by T(f)=500(1+jf 10...Ch. 12 - Prob. 12.85PCh. 12 - Prob. 12.86PCh. 12 - Prob. 12.87PCh. 12 - Prob. 12.88PCh. 12 - The amplifier described in Problem 12.82 is to be...Ch. 12 - Prob. 12.90PCh. 12 - Prob. 12.91CSPCh. 12 - Prob. 12.93CSPCh. 12 - Prob. 12.94CSPCh. 12 - Prob. D12.95DPCh. 12 - Op-amps with low-frequency open-loop gains of 5104...Ch. 12 - Prob. D12.97DP
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- Design an inverting amplifier to provide a closed-loop voltage gain of Ay = -22 V/V. The maximum input voltage signal is 30 mV with a source resistance in the range of 1 kls R, < 3 kN. The variable source resistance should introduce a difference in the gain no more than a 2% of the gain factor. What is the range in output voltage?arrow_forwardQ) An amplifier has voltage gain with the feedback of 100. If the gain without feedback changes by 40% and the gain with feedback should not vary more than 8%, the values of open-loop gain and feedback ratio will be respectively given by (a) 500 and 1.8% (b) 50000 and 0.8% (c) 500 and 0.8% (d) 5000 and 1.8%arrow_forwardThe figure below, plots the frequency response of a multi-pole amplifier. The phase margin of a feedback system employing this amplifier with K = 1 is: Magnitude (dB) Phase (deg) 100 50 of -50 90 45 0 10 10 Frequency (rad/sec) 0arrow_forward
- An amplifier has voltage gain with the feedback of 100. If the gain without feedback changes by 40% and the gain with feedback should not vary more than 8%, the values of open-loop gain and feedback ratio will be respectively given by (a) 500 and 1.8% (b) 50000 and 0.8% (c) 500 and 0.8% (d) 5000 and 1.8%arrow_forwardQUESTION 1 True or false? Negative unitary form is a type of feedback. O True Falsearrow_forwardAn amplifier without feedback has a gain of 1000. What is the gain having negative feedback of 0.009? A) 900 B) 125 C 100 D) 10arrow_forward
- Design an inverting amplifier to provide a closed-loop voltage gain of Ay -22 V/v. The maximum input voltage signal is 30 mV with a source resistance in the range of 1 kl < R, <3 kN. The variable source resistance should introduce a difference in the gain no more than a 2% of the gain factor. What is the range in output voltage?arrow_forwardFACTS:An amplifier, electronic amplifier or amp is an electronic device that can increase the power of a signal. Classification of the amplifier can be done in 3 different ways. Voltage amplifiers. Current amplifiers. Power amplifiers. QUESTION: You've learned in Module 1 that an Amplifier's Output can be positive or negative which is just natural since we're already dealing with AC signals. But, why do we use negative feedback in Amplifiers?arrow_forwardZOYN O all all K/s (a) Is increased (b) Is reduced (c) Remains the same (d) None of the above (2) jubäi Q) In the negative feedback, * :which statement is true (a) The gain with the feedback is decreased (b) The distortion with the feedback is decreased (c) The noise with the feedback is decreased (d) The gain of the amplifier is extremely stable (e) All the above O Q) In the positive feedback the closed loop gain is نقطة واحدة (a) Af = A/(1+AB)arrow_forward
- (b) Figure Q.1b(i) shows a feedback system of unit step response of the system in Figure Q.1b(i). Identify the values of K and A Output c() 2.0 1.6 1.2 3 R(s). 0.2 0.4 K Figure Q.thi 0.8 10 1.2 Time (Sec.) Figure Q.10) ((s) 1.6 1.8arrow_forwardc) Design two operational amplifier circuit having a gain of -10 and -18 each using a feedback resistor of 270 kQ for both circuits. Further, what output voltage will result for an input of 150 µV in each circuit?arrow_forwardFigure 5 shows a current series feedback amplifier. The sampled current signal is the output current, I, flowing in resistor, Rg, where it develops a feedback signal voltage, V; across the resistor, Rg. Determine: Vi. a) the feedback gain, B 1. : Io the gain without feedback, A = Vs b) A c) the gain with feedback, Af 1+BA +Varrow_forward
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