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Home/microelectronics by sedra and smith 8th edition chapter 11

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venkyelectrical
venkyelectrical
Asked: February 17, 2022In: microelectronics

11.25For the amplifier described in Exercise 11.24, rather than introducing a new dominant pole, we can use additional capacitance at the circuit node at which the first pole is formed to reduce the frequency of the first pole. If the frequency of the second pole is 10 MHz and if it remains unchanged while additional capacitance is introduced as mentioned, find the frequency to which the first pole must be lowered so that the resulting amplifier is stable for closed-loop gains as low as 20 dB. By what factor must the capacitance at the controlling node be increased? 1000 Hz; 1000

11.25For the amplifier described in Exercise 11.24, rather than introducing a new dominant pole, we can use additional capacitance at the circuit node at which the first pole is formed to reduce the frequency of the first pole. If the ...

microelectronics by sedra and smith 8th edition chapter 11
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venkyelectrical
venkyelectrical
Asked: February 17, 2022In: microelectronics

11.24A multipole amplifier having a first pole at 1 MHz and a dc open-loop gain of 100 dB is to be compensated for closed-loop gains as low as 20 dB by the introduction of a new dominant pole. At what frequency must the new pole be placed? 100 Hz

11.24A multipole amplifier having a first pole at 1 MHz and a dc open-loop gain of 100 dB is to be compensated for closed-loop gains as low as 20 dB by the introduction of a new dominant pole. At what ...

microelectronics by sedra and smith 8th edition chapter 11
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venkyelectrical
venkyelectrical
Asked: February 17, 2022In: microelectronics

11.23For the amplifier whose open-loop-gain frequency response is shown in Fig. 11.38, find the value of β that results in a phase margin of 45°. What is the corresponding closed-loop gain? 10−4; 80 dB

11.23For the amplifier whose open-loop-gain frequency response is shown in Fig. 11.38, find the value of β that results in a phase margin of 45°. What is the corresponding closed-loop gain? 10−4; 80 dB

microelectronics by sedra and smith 8th edition chapter 11
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venkyelectrical
venkyelectrical
Asked: February 17, 2022In: microelectronics

11.22Find the closed-loop gain at ω1 relative to the low-frequency gain when the phase margin is 30°, 60°, and 90°. 1.93; 1; 0.707

11.22Find the closed-loop gain at ω1 relative to the low-frequency gain when the phase margin is 30°, 60°, and 90°. 1.93; 1; 0.707

microelectronics by sedra and smith 8th edition chapter 11
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venkyelectrical
venkyelectrical
Asked: February 17, 2022In: microelectronics

11.21Consider an op amp having a single-pole, open-loop response with A0 = 105 and fP = 10 Hz. Let the op amp be ideal otherwise (infinite input impedance, zero output impedance, etc.). If this amplifier is connected in the noninverting configuration with a nominal low-frequency, closed-loop gain of 100, find the frequency at which |Aβ| = 1. Also, find the phase margin. 104 Hz; 90°

11.21Consider an op amp having a single-pole, open-loop response with A0 = 105 and fP = 10 Hz. Let the op amp be ideal otherwise (infinite input impedance, zero output impedance, etc.). If this amplifier is connected in the noninverting ...

microelectronics by sedra and smith 8th edition chapter 11
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venkyelectrical
venkyelectrical
Asked: February 17, 2022In: microelectronics

11.20Consider a feedback amplifier for which the open-loop transfer function A(s) is given by images Let the feedback factor β be frequency independent. Find the closed-loop poles as functions of β, and show that the root locus is that of Fig. E11.20. Also find the value of β at which the amplifier becomes unstable. (Note: This is the same amplifier that was considered in Example 11.11.)

11.20Consider a feedback amplifier for which the open-loop transfer function A(s) is given by

microelectronics by sedra and smith 8th edition chapter 11
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venkyelectrical
venkyelectrical
Asked: February 17, 2022In: microelectronics

11.19An amplifier with a low-frequency gain of 100 and poles at 104 rad/s and 106 rad/s is incorporated in a negative-feedback loop with feedback factor β. For what value of β do the poles of the closed-loop amplifier coincide? What is the corresponding Q of the resulting second-order system? For what value of β is a maximally flat response achieved? What is the low-frequency closed-loop gain in the maximally flat case? 0.245; 0.5; 0.5; 1.96 V/V

11.19An amplifier with a low-frequency gain of 100 and poles at 104 rad/s and 106 rad/s is incorporated in a negative-feedback loop with feedback factor β. For what value of β do the poles of the closed-loop amplifier coincide? What ...

microelectronics by sedra and smith 8th edition chapter 11
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venkyelectrical
venkyelectrical
Asked: February 17, 2022In: microelectronics

11.18An op amp having a single-pole rolloff at 100 Hz and a low-frequency gain of 105 is operated in a feedback loop with β = 0.01. What is the factor by which feedback shifts the pole? To what frequency? If β is changed to a value that results in a nominal closed-loop gain of +1, to what frequency does the pole shift? 1001; 100.1 kHz; 10 MHz

11.18An op amp having a single-pole rolloff at 100 Hz and a low-frequency gain of 105 is operated in a feedback loop with β = 0.01. What is the factor by which feedback shifts the pole? To what frequency? If ...

microelectronics by sedra and smith 8th edition chapter 11
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venkyelectrical
venkyelectrical
Asked: February 17, 2022In: microelectronics

11.17If in the circuit in Fig. 11.30(a), R2 is short-circuited, find the ideal value of Af. For the case Rs = Rid = ∞, give expressions for Ri, Ro, A, β, Af, Rin, and Rout. Af = −1 A/A; Ri = R1; Ro = ro2, A = −μgmR1; β = −1; Af = −μgmR1/(1 + μgmR1); Rin images 1/μgm; Rout images μ(gmro2)R1.

11.17If in the circuit in Fig. 11.30(a), R2 is short-circuited, find the ideal value of Af. For the case Rs = Rid = ∞, give expressions for Ri, Ro, A, β, Af, Rin, and Rout. Af = −1 A/A; Ri = ...

microelectronics by sedra and smith 8th edition chapter 11
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venkyelectrical
venkyelectrical
Asked: February 17, 2022In: microelectronics

11.16For the amplifier in Example 11.10, find the values of Af, Rin, and Rout when the value of μ is 10 times lower, that is, when μ = 100. −9.91 A/A; 921 Ω; 101 MΩ

11.16For the amplifier in Example 11.10, find the values of Af, Rin, and Rout when the value of μ is 10 times lower, that is, when μ = 100. −9.91 A/A; 921 Ω; 101 MΩ

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