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 11P
Assuming an ideal op-amp in Fig. P4.11, determine the value of
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9
+
R₂
2
www
R₁
Figure Q4.b(ii)
1) Draw the compete circuit with the op-amp included.
2) Obtain equations for the contribution made by each of the bias current sources
IBp, IBn and the voltage offset source Vos to the output voltage Vo.
3) Suggest how the value chosen for R3 will be related to R₁ and R₂.
The 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. 4
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.
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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- Q4: 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_forward4. a) Design the operational amplifier circuit of Figure Q4a to have an input resistance of 20 k2 and a time constant (RX C) of 15 us. What function does the circuit perform? Vg Figure Q4a Vo 5arrow_forwardPlease help with A,B and C. Also, please make it legible sometimes it's too small so it's blurry.arrow_forward
- Help on this pleasearrow_forwardOP AMPS DO( NEED NEAT HANDWRITTEN SOLUTION ONLY OTHERWISE DOWNVOTE).arrow_forwardQ4 a) Explain the DC imperfections of operational amplifiers. Draw a complete model of an operational amplifier with these imperfections. b) Consider the amplifier circuit shown in Figure Q4.b with a non-ideal operational amplifier and an ideal input voltage source, show that the DC output voltage with the signal voltage turned down to zero will be: R1 + R2) [+Vos + IppR3] – IBnR2 R, R2 R1 R3 Vo Figure Q4.b The amplifier in Figure Q4.b has an offset voltage Vos = ±3 mV, input bias current Ig = 13 µA and input offset current Ios = 6 µA. Calculate the maximum absolute output voltage that could occur due to the bias currents and offset voltage alone (i.e. with the signal source remaining in the circuit but turned down to zero volts), given that R1 = 1 kN, R2 = 100 k2 and R3 = 0Ω. d) An operational amplifier with a slew rate limit of 1 V/us is required to amplify a sinusoidal 100 kHz signal. Calculate the maximum amplitude of the output voltage that can be achieved without distortion.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_forwardPlease show workarrow_forwardPlease help with B,C, and D. Also, please make it legiable sometimes it's too small so it's blurry.arrow_forward
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What is a Power Amplifier, And Do I Need One?; Author: Sweetwater;https://www.youtube.com/watch?v=2wkmSm4V00M;License: Standard Youtube License