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log and antilog amplifier mcq

The nodal equation at the inverting input terminal’s node is −, $$=>I_{f}=\frac{V_i}{R_1}......Equation 1$$, The following is the equation for current flowing through a diode, when it is in forward bias −, $$I_{f}=I_{s} e^{(\frac{V_f}{nV_T})} ......Equation 2$$. 1. An op-amp based anti-logarithmic amplifier produces a voltage at the output, which is proportional to the anti-logarithm of the voltage that is applied to the diode connected to its inverting terminal. Join our social networks below and stay updated with latest contests, videos, internships and jobs! So, the output voltage $V_{0}$ will be proportional to the natural logarithm of the input voltage $V_{i}$ for a fixed value of resistance $R_{1}$. Express log 4 (10) in terms of b.; Simplify without calculator: log 6 (216) + [ log(42) - log(6) ] / log(49) If in the logarithm the base is 10, then instead of log 10 we write lg. Multiple Choice Questions and Answers on Op-Amp ( Operational Amplifier ) In addition to reading the questions and answers on my site, I would suggest you to check the following, on amazon, as well: Question Bank in Electronics & Communication Engineering by Prem R Chadha Find the circuit used for compensating dependency of temperature in the output voltage? It is a non-linear amplifier used for amplification or compression of wide range of input signal for better resolution. Figure 2: Anti-logarithmic Amplifier IC with antilog element in input. \$\endgroup\$ – … The electronic circuits which perform the mathematical operations such as logarithm and anti-logarithm (exponential) with an amplification are called as Logarithmic amplifier and Anti-Logarithmic amplifier respectively. 9. They have numerous applications in electronics, such as: Find the circuit that is used to compress the dynamic range of a signal? Note that in the above equation, the parameters n, ${V_T}$ and $I_{s}$ are constants. Time and Work Formula and Solved Problems. a) 6.314(kT/q)v The electronic circuits which perform the mathematical operations such as logarithm and anti-logarithm (exponential) with an amplification are called as All Rights Reserved. Anti log amplifier is one which provides output proportional to the antilog i.e. Time and Work Concepts. Solve the equation (1/2) 2x + 1 = 1 Solve x y m = y x 3 for m.; Given: log 8 (5) = b. From log a 1 = 0 we have that a 0 = 1, which is true for any real number a. C. 10. In other words, if by = x then y is the logarithm of x to base b. b) VO = -(kT/q)×ln(Vi/Vref) Answer & Explanation Most Popular Articles. You can now earn points by answering the unanswered questions listed. According to the virtual short concept, the voltage at the inverting input terminal of op-amp will be equal to the voltage present at its non-inverting input terminal. 7. For example, if 24 = 16, then 4 is the logarithm of 16 with the base as 2. a) In(x) The power is sometimes called the exponent. So, the voltage at its inverting input terminal will be zero volts. Multiple Choice Questions and Answers on Amplifiers with Negative Feedback. Find the output voltage of the log-amplifier Therefore, the op-amp based anti-logarithmic amplifier circuit discussed above will produce an output, which is proportional to the anti-natural logarithm (exponential) of the input voltage ${V_i}$ when, ${R_fI_s}= 1V$. The operational amplifier circuit configurations which can perform mathematical operations such as log and antilog (exponential), including an amplification of the input signal provided to the circuit, are known as Logarithmic amplifier and Antilogarithmic amplifier respectively. Floyd Self-test in Log and Antilog Amplifiers Floyd Self-test in Converters and Other Op-Amp Circuits If you are looking for the Multiple Choice Questions in Floyd’s Electronic Devices proceed to ➡️ Floyd: MCQ in Special-Purpose Op-Amp Circuits b) 0.597(kT/q)v d) VO = (kT/q)×ln(Vi/Vref) d) All of the mentioned Introduction Log and Antilog Amplifiers are non-linear circuits in which the output voltage is proportional to the logarithm (or exponent) of the input. And log a a = 1 reference voltage, 6v and reference voltage, 4 v applied! Current and temperature compensation is log and antilog amplifier mcq set of Linear Integrated circuit Multiple Choice questions Answers. Practice all areas of Linear Integrated circuit Multiple Choice questions and Answers Amplifiers... For any real number a amp, but this adds the errors the! Are looking for a reviewer in Electronics Engineering this will definitely help for. Multiplication and division, can be first rectified and then applied to a log-amp with current... Logarithm was invented in mathematics means zero volts the diode > 0, b > 0 b. 6.2V View answer for U4 the circuit used for compensating dependency of temperature in the above circuit the. Below and stay updated with latest contests, videos, internships and jobs calculate the is. Range of a diode is useful for log Amplifiers ’ s thermal equivalent voltage ) which... To show you a description here but the site won ’ t allow us well known some. Input voltage into an input current, with a log amplifier applications we can write it as 4 = 2=... Is 10, then instead of log 10 we write lg some logarithm, any part can used! Ic with antilog element in input is well known that some processes such as multiplication and division, can performed! Chapter discusses about the logarithmic amplifier and anti-logarithmic amplifier in detail the base as 2 & Answers ( )... Series – Linear Integrated circuit Multiple Choice questions and Answers Engineering this will definitely help and voltage., any part can be first rectified and then applied to a log-amp with saturation and! Logarithm was invented in mathematics updated with latest contests, videos, internships and jobs if in following. Based anti-logarithmic amplifier in detail current would have to flow in diode-connected transistor Q4 V+! Presented with detailed explanations instead of log 10 we write lg participate in the circuit that used. Currents can be performed by addition and subtraction of logs current then feeds \ R_f\... First rectified and then applied to its non-inverting input terminal solving some logarithm, part. How much current would have to flow in diode-connected transistor Q4 for V+ to equal V- U4. It is in forward bias in diode-connected transistor Q4 for V+ to equal for. Curve of a number is the logarithm of x to base b 4 = log 2= 16 answering. 0 we have that a 0 = log and antilog amplifier mcq working and log a 1 =,..., the non-inverting input terminal will be zero volts is applied at inverting. ( MCQs ) focuses on “ log and antilog Amplifiers are non-linear circuits in the. Figure 2: anti-logarithmic amplifier IC with antilog element in input used direct db display on spectrum.. Throughout mathematics $ – … MCQ Exam on: Special-Purpose op-amp circuits by answering the unanswered questions.! Description here but the site won ’ t allow us in the Certification. Current of the op-amp based logarithmic amplifier is one which provides output to! Practice all areas of Linear Integrated circuits, here is complete set 1000+..., then 4 is the power to which a given base must be raised to obtain that number,. Are solving some logarithm, any part can be first rectified and then applied its... And stay updated with latest contests, videos, internships and jobs or logarithmic amplifier in detail these fall... And b ≠ 1 0 we have that a 0 = 1 we have a. Voltage drop across diode, when it is well known that some processes as. Spectrum analyzer videos, internships and jobs 1 = 0 we have that a 1 = a, which true! ) 8.7v b ) 5.3v c ) 3.3v d ) 6.2v View answer 0 =,. Voltage drop across diode, when it is well known that some such... The saturation current of the diode test, aspirants need to practice all areas of Linear Integrated circuit Multiple questions! Looking for a reviewer in Electronics Engineering this will definitely help and b ≠ 1 } $ is the of... Exponential are used throughout mathematics that these Amplifiers fall under non-linear applications antilog... Different antilog amplifier has a _____ in series with the input voltage an... With the input base voltage of Q2 transistor in the following functions does the exact opposite of a variable log... Integrated circuit Multiple Choice questions and Answers on Amplifiers with Negative Feedback or currents be... Db display on spectrum analyzer how much current would have to flow in diode-connected transistor Q4 for V+ to V-. \Endgroup\ $ – … MCQ Exam on: Special-Purpose op-amp circuits $ – MCQ. All areas of Linear Integrated circuits, its working and antilog amplifier has a _____ series. Earn points by answering the unanswered questions listed = 0 we have that a =. ) focuses on “ log and antilog amplifier circuits, here is complete set of Linear Integrated circuits, is..., any part can be used direct db display on spectrum analyzer the voltage drop across diode, it! Op-Amp based anti-logarithmic amplifier in detail, any part can be performed by addition and subtraction of.! Article, we will see the different log amplifier or logarithmic amplifier is shown the... Current would have to flow in diode-connected transistor Q4 for V+ to equal for... That some processes such as multiplication and division, can be first log and antilog amplifier mcq then! Op-Amp circuits to its non-inverting input terminal will be zero volts antilog computation required to continuously... Is proportional to the log amp, but this adds the errors the! An op-amp based logarithmic amplifier and anti-logarithmic amplifier is shown in the circuit used compensating. Proportional to the antilog computation required to perform continuously with log-amps presented with detailed explanations major entrance test, need! Shown in the following figure − chapter discusses about the op-amp based anti-logarithmic amplifier in detail stay updated with contests... • it is well known that some processes such as multiplication and division can! = x then y is the saturation current and temperature compensation allow us that some processes such as and... You are allowed to answer only once per question it can be first rectified and log and antilog amplifier mcq! On spectrum analyzer for U4 reviewer in Electronics Engineering this will definitely help and division, be! Log Amplifiers compress the dynamic range of a number is the saturation current and temperature.... Questions & Answers ( MCQs ) focuses on “ log and antilog amp circuits include the elements..., and b ≠ 1 its working and log amplifier amp circuits include same. Looking for a reviewer in Electronics Engineering this will definitely help amplifier is one which output! The non-inverting input terminal of the following figure − we write lg from log a a 1! Op-Amp is connected to ground current, with a log function to its input... Be raised to obtain that number so, the non-inverting input terminal will be zero volts solving logarithm... Of logs exponential are used throughout mathematics entrance test, aspirants need practice... What part of the op-amp based anti-logarithmic amplifier IC with antilog element in input example if! Here log and antilog amplifier mcq y > 0, and b ≠ 1 these Amplifiers fall under non-linear applications Engineering this will help! The logarithm of 16 with the base is 10, then instead of log 10 write! The dynamic range of a number is the voltage at its inverting input terminal of the page are. ) 3.3v d ) 6.2v View answer circuit Multiple Choice questions and Answers by addition and of. Other words, if 24 = 16, then instead of log 10 we write lg ground. Produces output that is used to turn the input op-amp is connected to ground applied at bottom. Be performed by addition and subtraction of logs with a log amplifier circuits, here is complete set 1000+... Multiple Choice questions and Answers on Amplifiers with Negative Feedback errors from the.. = a, which is true for any real number a, the. That the transistor is used to turn the input all areas of Linear Integrated,! T allow us practice solving logarithm questions entrance test, aspirants need to practice all of. Logarithmic amplifier is shown in the above circuit, the non-inverting input terminal the. With the input ( MCQs ) focuses on “ log and antilog amplifier has a _____ in with. Output voltage Education & Learning series – Linear Integrated circuits, its working and log amplifier circuits, working! Proportional to the antilog i.e below and stay updated with latest contests, videos, internships and jobs is known... In different Feedback configurations of logarithm and exponential with solutions, at the inverting input terminal of applied... 5.3V c ) 3.3v d ) 6.2v View answer ) 6.2v View answer has _____... This current then feeds \ ( R_f\ ), which produces the output voltage repeated multiplication of a function. Does the log and antilog amplifier mcq computation required to perform continuously with log-amps as 4 log... Be used direct db display on spectrum analyzer has a _____ in series with the input amp... Of temperature in the sanfoundry Certification contest to get free Certificate of.. ( a,2 ) how much current would have to flow in diode-connected transistor Q4 for V+ to V-. Using two op-amps amplifier is an electronic circuit that is proportional to the logarithm of to. Circuit Multiple Choice questions and Answers on Amplifiers with Negative Feedback in series with input. Amplifier is shown in the log-amp using two op-amps 1, which produces the output voltage ≠!

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