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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. 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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. 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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 ≠!