Figure QI shows the circuit diagram of a "Logarithmic Amplifier". In thiscircuit the feedback resistor of a normal inverting amplifier is replaced by asilicon diode. Since the current flowing through the diode increasesexponentially with the voltage across the diode, the voltage across the diodewill be proportional to the logarithm current flowing through it. Hence theoutput of the circuit is proportional to the logarithm of the input voltage.QIDIRINAlFigure QIThe 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 diodeg is the charge on the electron (given at the back of the examination sheet)V, is the voltage across the diodeK, 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, isContinued overleafPage 2 of 9QI (a) 0)Neglecting any input errors of Al (ie. using a perfect opampcalculation) derive an expression for Vour as a function of a positivevalue of V showing that the output voltage has a logarithmicdependence on Vy. State clearly any assumptions you makeWhat would happen if Vay Was negative? (Hint: Remember that DI is adiode)(1)(b)Re draw the circuit showing all sources of DC error.From your answer to part b) derive an expression for the DC errar in inputvoltage due to the input voltage and current errors of Al.(c)Al is one of the opamps listed in table QI. Using the expression derived in c)choose a value of R, and carefully cxplain your choice(d)ОрampVas (je V)Ib (pA)lest pA)OPA1893300600ICL76523030ADA4530-1400.020.02Table QIThe maximum permissible current through the diode is ImA. Given that Vs10V, choose a value for Ry(e)Al is one of the opamps listed in Table Q1, and given your value of R, fromd), define a figure of merit for Al and hence choose the best opamp for Al.I(1)(g)(i)What is the ratio of the largest to the smallest input voltages which thecircuit can reliably accept?(ii)If I, = 0.5pA what range of output voltages does this correspond to

"According to the Company's policy we will provide solution of first part of the question, if you…

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. QI DI Res AI RM Figure QI The current flowing through a diode is given by the Shock y Diode Equat n t,

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. QI DI Res AI RM Figure QI The current flowing through a diode is given by the Shock y Diode Equat n t,

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter18: Resistive-inductive Parallel Circuits

Section: Chapter Questions

Problem 13PP: In an R-L parallel circuit, IT=1.25 amps, R=1.2k, and XL=1k. Find IR

See similar textbooks

Similar questions

Construct a non-inverting amplifier and a differential amplifier using OP-AMP with feedback resistance Rf. Derive the output expression for each configuration.
The circuit in the visual containing a non-linear element will be analyzed with the Small Signal Analysis method and the VR2 (t) voltage will be calculated. For this purpose, find the operating point VkQ, IkQ voltage and current values of the nonlinear element.
For the circuit shown above, find the gain (vo / vi). Make simplifying assumptions about the OP-AMP such as v+= v- but you must state the conditions for which this is true. Please as soon as possible！
An amplifier is formed by cascading three identical operational-amplifier stages, as shown . (a) Replace each op amp circuit with itstwo-port representation. (b) Use the circuit model from part (a) to find the overall two-port representation (Av, Rin, Rout) for the complete three-stageamplifier. (c) Draw the two-port circuit corresponding to the complete three-stage amplifier.
Determine the output voltage of an op-amp forinput voltages of Vi1=150μV, Vi2=140μV and CMRRs of100 and 105. (Given Ad =4000) Vd=? Vc=?
Draw the AC equivalent circuit and find Zi, Zo, Av, Ai (ignore the effect of To). Show all the necessary derivations and label all the parameters properly.
ex: also could you help explain if consider this as an op-amp circuit, why the 1k ohms resistance belongs inside the amplifier but not Rin?
Suppose that each output channel of a computer’ssound card can be represented by a 1-V ac sourcein series with a 32-Ω resistor. Each channel ofthe amplifier in the external speakers has an inputresistance of 20 k , and must deliver 10 W intoan 8-Ω speaker. (a) What are the voltage gain, currentgain, and power gain required of the amplifier?(b) What would be a reasonable dc power supplyvoltage for this amplifier?
Q4/A)- Show the connection of three combination op-amp stages using an LM348 IC to provide outputs that are 110, 1681, and 420 times larger than the input. Use a feedback resistor of Rf = 400 k? in all stages, while can use only (R= 40 k? for first stage), (R= 10 k? for second stage), and (R= 20 k? for third stage
An op-amp has an open-loop gain of 104 and a dominant open-loop pole at 4Hz. If an inverting amplifier with a gain of -100 is made from this op-amp, what is the resulting amplifier bandwidth? What is the gain-bandwidth product?
A differential amplifier has a differential gain of 500 and negligible common-mode gain. The input terminals are tied to ground through 1-kΩ resistors having tolerances of ±5 percent. What are the extreme values of the output voltage caused by a bias current of 100 nA? What is the output voltage if the resistors are exactly equal?
Considering the amplifier gain 13 and the number 2 as N, design a Wien Bridge oscillator circuit with an oscillating frequency ((1 + N) × 1000) Hz. Draw the circuit. Show the process steps. Show the values of the circuit elements in your drawing. I would be very happy if you could be quick :)