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. Basically it performs mathematical operation of an anti-logarithm. View Answer, 3. This chapter discusses about the Logarithmic amplifier and Anti-Logarithmic amplifier in detail. If V in is the input signal applied to a Anti log amplifier then the output is V o = K * exp (a * V i) where K is proportionality constant, a is constant. Basics of Integrated Circuits Applications. The electronic circuits which perform the mathematical operations such as logarithm and anti-logarithm (exponential) with an amplification are called as A basic anti-log amplifier is shown in Figure \(\PageIndex{3}\). 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. Anti-logarithmic or exponential amplifier (or simply antilog amplifier) is an op-amp circuit configuration, whose output is proportional to the exponential value or anti-log value of the input. here is complete set of 1000+ Multiple Choice Questions and Answers, Prev - Linear Integrated Circuit Questions and Answers – Very High Input Impedance Circuit, Next - Linear Integrated Circuit Questions and Answers – Multiplier and Divider – 1, Linear Integrated Circuit Questions and Answers – Very High Input Impedance Circuit, Linear Integrated Circuit Questions and Answers – Multiplier and Divider – 1, Chemical Engineering Questions and Answers, Electrical Measurements Questions and Answers, Instrumentation Transducers Questions and Answers, Design of Electrical Machines Questions and Answers, Electrical Machines Questions and Answers, Wireless & Mobile Communications Questions & Answers, Electronic Devices and Circuits Questions and Answers, Basic Electrical Engineering Questions and Answers, Linear Integrated Circuits Questions and Answers, Linear Integrated Circuit Questions and Answers – Input Bias Current, Linear Integrated Circuit Questions and Answers – Basic DAC Techniques – 2, Linear Integrated Circuit Questions and Answers – Input Offset Current and Total Output Offset Voltage, Linear Integrated Circuit Questions and Answers – Instrumentation Amplifier – 2, Linear Integrated Circuit Questions and Answers – Peak Detector, Sampling & Hold Circuit and Absolute Value Output Circuit. c) Sinh(x) Answer Questions and Earn Points !!! We would like to show you a description here but the site won’t allow us. Find the circuit that is used to compress the dynamic range of a signal? d) All of the mentioned AntiLog amplifier or anti–logarithmic amplifier is an electronic circuit that produces output that is proportional to the anti-logarithm of the applied input. •Log and Antilog Amplifiers are non-linear circuits in which the output voltage is proportional to the logarithm (or exponent) of the input. This section discusses about the op-amp based logarithmic amplifier in detail. c) VO = Vref×(10-k’vi) log a 1 = 0 and log a a = 1. A logarithmic amplifier, or a log amplifier, is an electronic circuit that produces an output that is proportional to the logarithm of the applied input. d) VO = Vref-(10-k’vi) A current-to-voltage converter produces a A(n) ________ amplifier provides "a barrier" between the input and output for the protection of human life or sensitive equipment. Log-Antilog Log and antilog amp circuits include the same elements but arranged in different feedback configurations. To solve this problem, logarithm was invented in mathematics. This set of Linear Integrated Circuit Multiple Choice Questions & Answers (MCQs) focuses on “Log and Antilog Amplifier”. Figure 2: Anti-logarithmic Amplifier IC with antilog element in input. You may also like: Antilogarithmic Amplifier. The circuit diagram of an op-amp based logarithmic amplifier is shown in the following figure −. From log a 1 = 0 we have that a 0 = 1, which is true for any real number a. If log 3 [log 2 (x 2 – 4x – 37)] = 1, where ‘x’ is a natural number, find the value of x. So, the output voltage ${V_0}$ will be proportional to the anti-natural logarithm (exponential) of the input voltage ${V_i}$, for a fixed value of feedback resistance ${R_f}$. 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 $R_{1}$. An anti-logarithmic amplifier, or an anti-log amplifier, is an electronic circuit that produces an output that is proportional to the anti-logarithm of the applied input. C. 10. Which of the following functions does the antilog computation required to perform continuously with log-amps? 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, ${R_fI_s}= 1V$. Please note that these amplifiers fall under non-linear applications. A. a) 6.314(kT/q)v The compression of any wide-range input signal, analog computing circuits, linearization of exponential sources, such as transducers, certain types of audio circuits, compression and expansion circuits for voice communications. Applications of Anti-logarithmic Amplifier IC. Log and Antilog Amplifier. An op-amp based logarithmic amplifier produces a voltage at the output, which is proportional to the logarithm of the voltage applied to the resistor connected to its inverting terminal. Find the circuit used for compensating dependency of temperature in the output voltage? Solve the equation (1/2) 2x + 1 = 1 Solve x y m = y x 3 for m.; Given: log 8 (5) = b. Basically it performs mathematical operation of a logarithm. Log Amplifier using a Single Diode and Op-Amp. Sanfoundry Global Education & Learning Series – Linear Integrated Circuits. 1. shorthand/stand for the repeated multiplication of a variable The power is sometimes called the exponent. Answer & Explanation Most Popular Articles. View Answer, 8. 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. How to provide saturation current and temperature compensation in log-amp? View Answer, 7. Hence, equate the right hand side term of those two equations as shown below −, $$\frac{V_i}{R_1}=I_{s}e^{\left(\frac{-V_0}{nV_T}\right)}$$, $$\frac{V_i}{R_1I_s}= e^{\left(\frac{-V_0}{nV_T}\right)}$$, Applying natural logarithm on both sides, we get −, $$In\left(\frac{V_i}{R_1I_s}\right)= \frac{-V_0}{nV_T}$$, $$V_{0}=-{nV_T}In\left(\frac{V_i}{R_1I_s}\right)$$. exponential to the input voltage. D. 4. Output of summing amp U3 is 1.2V then. \$\endgroup\$ – … Note that the transistor is used to turn the input voltage into an input current, with a log function. $I_{s}$ is the saturation current of the diode. If you are looking for a reviewer in Electronics Engineering this will definitely help. c) 0.405(kT/q)v Banking on our enriched industry experience, we are able to offer a wide gamut of Log and Antilog Amplifier.These high performing Log and Antilog Amplifiers offered by us are non-linear circuits, in which the output voltage is proportional to the logarithm (or exponent) of the input.We take into account the ever changing requirements of different industries and offer innovative range of products. From log a a = 1 we have that a 1 = a, which is true for any real number a. So, the voltage at its inverting input terminal will be zero volts. c) Applying input and reference voltage to separate log-amps It is a non-linear amplifier used for amplification or compression of wide range of input signal for better resolution. View Answer, 5. 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