Basic Engineering Circuit Analysis
11th Edition
ISBN: 9781118539293
Author: J. David Irwin, R. Mark Nelms
Publisher: WILEY
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Textbook Question
Chapter 4, Problem 38P
Find the input/output relationship for the current amplifier shown in Fig. P4.38.
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For the amplifier in Fig. P4.15, find the gain
(R1=3.5 kQ, R2=27 KQ)
2
VS
R₂
R₁
-OV
4.90 A reverse-biased photodiode is specified to have a dark current of 100 pA and a responsivity of 0.5 A/W. It is
connected to the transresistance amplifier shown in Fig. P4.90. Assume an ideal op amp.
(a) What is the reverse-bias voltage across the photodiode?
(b) What is the output voltage vo with no illumination?
(c) What is the output voltage vo with 10 µW of light incident on the photodiode?
250 kN
On o
+3 V.
Figure P4.90
Hint: since we are assuming an ideal op amp, there is a virtual short-circuit between
input terminals.
Op Amp Characteristics (assume non-ideal)The op-amp circuit shown in Fig. P4.8 has a constant dcvoltage of 6 V at the noninverting input. The inverting input isthe sum of two voltage sources consisting of a 6 V dc source anda small time-varying signal us.(a) Use the op-amp equivalent-circuit model given in Fig. 4-6 todevelop an expression for uo.(b) Simplify the expression by applying the ideal op-amp model,which lets A→¥, Ri →¥, and Ro →0.
Chapter 4 Solutions
Basic Engineering Circuit Analysis
Ch. 4 - An amplifier has a gain of 15 and the input...Ch. 4 - An amplifier has a gain of 5 and the output...Ch. 4 - An op-amp based amplifier has supply voltages of...Ch. 4 - For an ideal op-amp, the voltage gain and input...Ch. 4 - Revisit your answers in Problem 4.4 under the...Ch. 4 - Revisit the exact analysis of the inverting...Ch. 4 - Revisit the exact analysis of the inverting...Ch. 4 - An op-amp based amplifier has 18V supplies and a...Ch. 4 - Assuming an ideal op-amp, determine the voltage...Ch. 4 - Assuming an ideal op-amp, determine the voltage...
Ch. 4 - Assuming an ideal op-amp in Fig. P4.11, determine...Ch. 4 - Assuming an ideal op-amp, find the voltage gain of...Ch. 4 - Assuming an ideal op-amp in Fig. P4.13, determine...Ch. 4 - Determine the gain of the amplifier in Fig. P4.14....Ch. 4 - For the amplifier in Fig. P4.15, find the gain and...Ch. 4 - Using the ideal op-amp assumptions, determine the...Ch. 4 - Using the ideal op-amp assumptions, determine...Ch. 4 - In a useful application, the amplifier drives a...Ch. 4 - The op-amp in the amplifier in Fig. P4.19 operates...Ch. 4 - For the amplifier in Fig. P4.20, the maximum value...Ch. 4 - For the circuit in Fig. P4.21, (a) find Vo in...Ch. 4 - Find Vo in the circuit in Fig. P4.22, assuming...Ch. 4 - The network in Fig. P4.23 is a current-to-voltage...Ch. 4 - Prob. 24PCh. 4 - Determine the relationship between v1 and io in...Ch. 4 - Find Vo in the network in Fig. P4.26 and explain...Ch. 4 - Determine the expression for vo in the network in...Ch. 4 - Show that the output of the circuit in Fig. P4.28...Ch. 4 - Find vo in the network in Fig. P4.29.Ch. 4 - Find the voltage gain of the op-amp circuit shown...Ch. 4 - Determine the relationship between and in the...Ch. 4 - Prob. 32PCh. 4 - For the circuit in Fig. P4.33, find the value of...Ch. 4 - Find Vo in the circuit in Fig. P4.34.Ch. 4 - Find Vo in the circuit in Fig. P4.35.Ch. 4 - Determine the expression for the output voltage,...Ch. 4 - Determine the output voltage, of the noninverting...Ch. 4 - Find the input/output relationship for the current...Ch. 4 - Find V0 in the circuit in Fig. P4.39.Ch. 4 - Find Vo in the circuit in Fig. P4.40.Ch. 4 - Find the expression for in the differential...Ch. 4 - Find vo in the circuit in Fig. P4.42.Ch. 4 - Find the output voltage, vo, in the circuit in...Ch. 4 - The electronic ammeter in Example 4.7 has been...Ch. 4 - Given the summing amplifier shown in Fig. 4PFE-l,...Ch. 4 - Determine the output voltage V0 of the summing...Ch. 4 - What is the output voltage V0 in Fig. 4PFE-3. a....Ch. 4 - What value of Rf in the op-amp circuit of Fig....Ch. 4 - What is the voltage Vo in the circuit in Fig....
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- A battery-powered C-E amplifier is operating from a single 1.5-V battery. Estimate its voltage gain. What will the gain be if the battery voltage dropsto 1 V?arrow_forward[Q4A] Design a circuit based on op-amp of 30 mA output which used to drive five LEDs each one need 20 mA to work and ensure the LEDs (ON) even if one of LEDs broken or damage. Then explain why you chosen this circuit and how this circuit works.arrow_forwardProblem 4.17: You have access to resistors with values 1 k2, 1.5 kn, and 5.0 k2. You have a voltage signal from a transducer with a maximum voltage of 0.2 V. Using a noninverting op amp configuration, what maximum output voltages could you provide with the combinations of these resistors? Sketch your op amp circuit options.arrow_forward
- Question 4 OV IT R ORE Vz -VDD Figure Q4b b) The current sink shown in figure Q4b provides the amplifier with improved common mode rejection ratio (CMRR) i) ii) What is CMRR ? Describe how the circuit works to maintain a constant current, IT. If a 5.6V zener was used, evaluate the value of RE required to maintain a constant current, IT, of 200µA via a transistor whose current gain is 100. iv) iii) Sketch a current source version of figure Q4barrow_forwardFind the voltage gain of the op-amp circuit shown in Fig. P4.30. (R1-20 KQ, R2-84 k0, R3-4 k0, R4-30 KQ) V₁ R1 ww Figure P4.30 R2 ww R3 ww R4 Varrow_forwardThe circuit shown in Fig. 4 provides transfer characteristics with +7.5 V levels at the output vo. When v 0 V, a current of 0.5 mA flows in the feedback resistor (R2) and a current of 1.0 mA flows through the zener-diodes. Assume that the output saturation levels of the op-amp are ±12.0 V, the forward-drop voltage of the zener-diode is 0.7 V, and the value of R, is equal to R2. a) Specify the zener-voltages of the zener diodes. b) Find the values of all resistors. R2 R1 R Z Z, Fig. 4arrow_forward
- Consider the amplifier shown below. Assume R4=100 k2, R2 = 30 k2, B = 100, VT-25 mV and VA-150V. Assume Vc=1.2V. !3! %3D a) Sketch the small-signal equivalent circuit of the amplifier. b) Find the input resistance Rin. L. c) Find the value of vo If v= 8 mv. d) Explain in your own words, what will happen in the performance of the amplifier if the bypass capacitor is removed. +5 V Re=7 ko Ca R = 10 ka R2 CE 2 ka -5V Maximum size for new files: 10MB, maximum attachments:: ww HH ww wwarrow_forwardFigure QI shows the circuit diagram of a "Logarithmic Amplifier". In this circuit the feedback resistor of a normal inverting amplifier is replaced by a silicon diode. Since the current flowing through the diode increases exponentially with the voltage across the diode, the voltage across the diode will be proportional to the logarithm current flowing through it. Hence the output of the circuit is proportional to the logarithm of the input voltage. QI DI RIN Al Figure QI The current flowing through a diode is given by the Shock' y Diode Equat n: 1,=1, (e" =1) where , is the current flowing through the diode g is the charge on the electron (given at the back of the examination sheet) V, is the voltage across the diode K, is Boltzmann's constant (given at the back of the examination sheet) Tis room temperature (given at the back of the examination sheet) Given that /,> 1, an approximate expression for V, as a function of I, is Continued overleaf Page 2 of 9 QI (a) 0) Neglecting any input…arrow_forwardQ4: Consider the uA741C-based op-amp amplifier circuit shown below; The input voltage, Vi, is 2.5 volts. R2 is 5,000 ohms and RI is 1,000 ohms : R2 vo • What is the name of the circuit? • What is the value of the voltage at the negative input of the op-amp? • What is the value of the current through the 1 k2 resistor, in?arrow_forward
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