Electronics Fundamentals: Circuits, Devices & Applications
8th Edition
ISBN: 9780135072950
Author: Thomas L. Floyd, David Buchla
Publisher: Prentice Hall
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Textbook Question
Chapter 18, Problem 5P
A certain diff-amp has a differential gain of 60 and a common-mode gain of 0.09. Determine the CMRR and express it in decibels.
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Note:CMRR = Differential gain / Common mode gainTo calculate common mode gain, apply V1 and V2 = 1V and measure Vout.Acm = 2Vout/(V1+V2)To calculate differential mode gain, apply V1 = 2V and V1 = 1V and measure Vout.Ad = Vout/(V1- V2)
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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- Determine the cutoff frequency of an op-amp having specified values B1=4 MHz and AVD= 171 V/mV.arrow_forwardCompute the Current Gain (Gi=iL/is) by applying the ideal op-amp model by taking A → ∞, Ri → ∞, and Ro → 0) where RL = 31 and RS=117.arrow_forwarda. IcQ. b. VCEQ. c. Locate the Q-point on the output characteristics. d. Draw the AC equivalent circuit of the above bias network. R1=100kOhms R2=17kOhmsarrow_forward
- 5. The mid band gain of an amplifier is 100 and the lower cutoff frequency is 1KHz. Find the gain of the amplifier at a frequency of 20 Hz.arrow_forwardDetermine Voltage gain, Av Determine overall Voltage gain, Avs = Vo/Vs Determine Current gain, Ais Determine Output resistance including R3arrow_forwardWhich of the following characteristics indicates a practical amplifier design in terms of input impedance? a.Low Zi b.High Zi c.Negative Zi d.Zero Ziarrow_forward
- For a given opamp circuit, the value of CMRR is 40 dB. If the differential gain is Ad=105, then what will be the value of the common mode gain Ac?arrow_forwardDetermine gm: Determine input resistance of the amplifier: Determine Input resistance seen by the source (to the right of C1) Determine Voltage gain, Av Determine overall Voltage gain, Avs = Vo/Vs Determine Current gain, Ais Determine Output resistance including R3arrow_forwardDraw the small signal equivalent circuit. Determine the following: Zo Zin Av (voltage gain) Ai (current gain) Voarrow_forward
- In a certain instrumentation amplifier, the input signal consists of a 20-mV-rms differential signal and a 5-V-rms 60-Hz interfering common-mode signal. It is desired that the common-mode contribution to the output signal be at least 60 dB lower than the contribution from the differential signal. What is the minimum CMRR allowed for the amplifier in decibels?arrow_forwardWith inputs VI= −50 mV, and VN = +50 mV, an op-amp working in a differential mode has an output Vo = 1.0022 V. When the op-amp is used in a common mode amplifier with inputs VI=VN = 5V, the output is V0= 0.2021 V. Determine the common mode rejection ratio (CMRR), expressed in dB.arrow_forward"For a Wien-bridge oscillator, if the feedback resistor has a value of 10-kohm, determine the value of Ri."arrow_forward
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Differential Amplifiers Made Easy; Author: The AudioPhool;https://www.youtube.com/watch?v=Mcxpn2HMgtU;License: Standard Youtube License