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 4PFE.4TP
What value of
a.
b.
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Figure 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.
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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…
E) For the op-Amp circuit shown, find the output V..
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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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- R2 1 vo Oxford University Publishing Microelectronic Circuits by Adel S. Sedra and Kenneth C. Smith (0195323033) For the op-amp circuit above and given R1 = 10 Ohm, R2 = 5 Ohm, if the DC gain of the op-amp is only 10 (A = 10), what is the output voltage for an input voltage of 0.5V? [Give your answer in number form, no units, no unit prefixes, no commas. Answer to 3 decimal places. Be sure to include negative sign in front, if required Example: 10mV--> Answer Given: 0.010] + 3.arrow_forwardFind the output voltage ?? of the Op-Amp circuit shownarrow_forwardB3arrow_forward
- 1. Given that the input V1(t) in Figure 4 (a) is a 3V peak triangle wave at 4 kHz.Answer the following 2.The circuit in Figure 4 (b) has 5 op-amps labeled as U1 through U5. State what the op-amp circuit is for U1 Circuit: U2 Circuit: U3 Circuit: U4 Circuit: U5 Circuit: 3. Determine the values of VO1, VO2, VO3, VO4 and VO5. 4. Draw the output waveform at VO5 for the given input waveform shown in Figure 4 (a).arrow_forward2) Obtain the T.F of the op-amp cct. shown below: C2 R4 R2 R3 ww R1 E,(s) E(s) E,(s)arrow_forwardPlease show workarrow_forward
- 4.27 Design an op-amp circuit that performs an averaging operation of five inputs v₁ to v5.arrow_forward2K The op amp used in the inverting amplifier circuit is not ideal. In fact, it is an LM741 with the following parameters: v W Rin = 2 MQ, AoL = 200 V/mV, Rout = 200 Q. Determine the gain vo/vi of the op amp circuit. If the gain computed in a is the actual gain, what is the percentage accuracy of the computed gain if the op amp is considered ideal? 4. 1K vo а. b.arrow_forwardB4.833 C. 7.250 D. 2.417 Fig. 8 50 kOhm m Sk Ohm M+ 5 k Ohm M mm-11 N Ex >10k Ohm Vo 23 Q15. The non-ideal Op. Amp. in the circuit shown in Fig. 8 has an open-loop gain A = 75, an input resistance ris of 10 ks2 and a zero output resistance. Then the gain of the amplifier is: 4.04 しっ Q16. Which one of the following statements is (are) correct about JFET: A. The JFET has a high input impedance. B. The JFET is considered as a low power consumption device. In JFET, the gate source cut off voltage is numerically greater than the pinch off voltage. D. A and B. E. B and C. Good Luckarrow_forward
- I need the answer as soon as possiblearrow_forwardCreate Op-amp circuit... with:Vin= -1 Volt (DC) Vout = 14 Volt (DC) Only resistors with 1k, 3k, 5k, 7k and 11k ohms can be used while the circuit is being built. The V+ value of the LM741 IC to be used for op-amps will be 20 volts and the V- value will be -20 volts. You need to use at least one inverting amplifier and one non-inverting amplifier to build the circuit. Question: Write the gain formula of the circuit and calculate it, and write how we should find the Vout value..arrow_forwardWhat output voltage results in the circuit below for an input of 0.5 V. Refer to the following for the values of Rf = 413981 ohms, R1 = 16788 ohms. Express your answer up to two decimal places. ... V. 360 kQ 12 ko Round your answer to 2 decimal places.arrow_forward
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