Electronics Fundamentals: Circuits, Devices & Applications
8th Edition
ISBN: 9780135072950
Author: Thomas L. Floyd, David Buchla
Publisher: Prentice Hall
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Chapter 18, Problem 6TFQ
To determine
Whether the given statement is true or false.
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The voltage gain of an amplifier is 3000 when no feedback is applied. When negative feedback is applied and feedback factor is 0.01, then estimate the gain with feedback.
77.One condition for positive feedback is that the phase shift around the feedback loop must be _______°.
76.In order to start up, a feedback oscillator requires
A. positive feedback greater than 1.
B. unity feedback equal to 1.
C. no feedback.
D. negative feedback less than 1.
75.A circuit that can change the frequency of oscillation with an application of a dc voltage is sometimes called
A. an astable multivibrator.
B. a voltage-controlled oscillator.
C. a crystal oscillator
D. a Hartley oscillator
74.Which of the following is required for oscillation?
A. The phase shift around the feedback network must be 180º
B. None of the above
C. ßA > 1
D. Both ßA > 1 and the phase shift around the feedback network must be 180º.
The return ratio for a circuit is 220. What is the amount of feedback, correct up to 2 decimal places?
Chapter 18 Solutions
Electronics Fundamentals: Circuits, Devices & Applications
Ch. 18 - When a diff-amp has identical signals on both...Ch. 18 - A high CMRR for a diff-amp means the common-mode...Ch. 18 - Prob. 3TFQCh. 18 - The open-loop voltage gain of an op-amp is also...Ch. 18 - Prob. 5TFQCh. 18 - Prob. 6TFQCh. 18 - In a voltage-follower, the open-loop and...Ch. 18 - Prob. 8TFQCh. 18 - Prob. 9TFQCh. 18 - If the feedback resistor in an amplifier is open,...
Ch. 18 - Which characteristic docs not necessarily apply to...Ch. 18 - In selecting an op-amp. suppose you have several...Ch. 18 - Prob. 3STCh. 18 - Prob. 4STCh. 18 - Prob. 5STCh. 18 - Prob. 6STCh. 18 - Prob. 7STCh. 18 - Prob. 8STCh. 18 - If you know an op-amp's open-loop gain and nothing...Ch. 18 - Prob. 10STCh. 18 - Prob. 11STCh. 18 - The highest possible input resistance is achieved...Ch. 18 - Compare a practical op-amp to an ideal op-amp.Ch. 18 - Two IC op-amps are available to you. Their...Ch. 18 - Identify the type of input and output...Ch. 18 - Prob. 4PCh. 18 - A certain diff-amp has a differential gain of 60...Ch. 18 - A certain diff-amp has a CMRR of 65 dB. If the...Ch. 18 - Identify the type of input mode for each op-amp in...Ch. 18 - Show the common-mode input in Figure 18-37 in an...Ch. 18 - Determine the bias current, IBIAS, given that the...Ch. 18 - Distinguish between input bias current and input...Ch. 18 - A certain op-amp has a CMRR of 250,000. Convert...Ch. 18 - The open-loop gain of a certain op-amp is 175,000....Ch. 18 - The op-amp data sheet specifies a CMRR of 300,000...Ch. 18 - Figure 18-38 shows the output voltage of an op-amp...Ch. 18 - How long does it take the output voltage of an...Ch. 18 - Identify each of the op-amp configurations in...Ch. 18 - For the amplifier in Figure 18-40. determine the...Ch. 18 - Determine the closed-loop gain of each amplifier...Ch. 18 - Find the value of Rf that will produce the...Ch. 18 - Find the gain of each in amplifier in Figure...Ch. 18 - If a signal voltage of 10 mV applied to each...Ch. 18 - Determine the approximate values for each of the...Ch. 18 - Determine the input and output resistances for...Ch. 18 - Repeat Problem 23 for each circuit in Figure...Ch. 18 - Repeat Problem 23 for each circuit in Figure...Ch. 18 - Prob. 26PCh. 18 - Prob. 28PCh. 18 - Prob. 29PCh. 18 - Prob. 30PCh. 18 - Prob. 31PCh. 18 - Prob. 32P
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- If the voltage gain of the amplifier section of a certain oscillator is equal to 100, what is the required attenuation of the feedback?A. 1B. 0.1C. 50D. 0.99arrow_forwardA differential amplifier has an open-loop voltage gain of 150 when the input signals are 3.55V and 3.50 V. Determine the output voltage of the amplifier. a. 0.0225 kV b. 0.25 kVc.1 kV d. 1.25 kVarrow_forwardCalculate the gain of the negative feedback amplifier having A=-1050 and Beta=-0.82.arrow_forward
- Determine the input and output impedances with feedback for voltage shunt having A = 100, B = 0.1 Zin = 10K ohms and Zout = 1k ohms.arrow_forwardCompared to circuit without feedback, the output impedance in current shunt circuit is A.unpredictable B.not related at all C.similar D.larger E.dependiing on frequency F.smallerarrow_forwardThe open loop gain of an amplifier is 3000. When a negative feedback with a feedback ratio of 0.01 is applied, determine the new gain of the amplifier.arrow_forward
- The noise figure of an amplifier is 56 dB. Calculate the output signal-to-noise ratio when the input signal-to-noise ratio is 70 dB.arrow_forwardAn amplifier has a voltage gain of 16 for frequencies above 10 kHz, and zero gain for frequencies below 10 kHz. Classify this amplifier.arrow_forwardFor the unity feedback systems.arrow_forward
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Current feedback amplifiers - Overview and compensation techniques; Author: Texas Instruments;https://www.youtube.com/watch?v=2WZotqHiaq8;License: Standard Youtube License