Antilog amplifiers along with log amplifiers are used to perform analogue computations on the input signals. The circuit of an antilog amplifier. But if diode current is too low then the OP Amp input offsets become Then finally choose a max temp difference of the log and antilog diodes. EXPERIMENT 8: Log and Antilog Amplifiers. Objectives: To understand the behavior of logarithmic and antilogarithmic amplifiers. Materials and Equipment.

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But this depends on your thermal design.

Sign up using Email and Password. SPICE simulation of voltage multiplier using log and antilog amplifier.

Linear Integrated Circuits Applications Log And Anti Log Amplifiers

An anti-logarithmic amplifieror an anti-log amplifieris an electronic circuit that produces an output that antolog proportional to the anti-logarithm of the applied input. You’ve simulated it, so why do you ask if it works for you? It is called four-quadrant since inputs and output can be positive or negative.

Tony EE rocketscientist 62k 2 21 Constant terms are omitted for simplicity. It is well known that some processes such as multiplication and division, can be performed by addition and subtraction of logs. Some integrated log amps have uncommitted elements allowing us to implement antilog amps. Log-Antilog Log and antilog amp circuits include the same elements but arranged in different feedback configurations.

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The system bandwidth is narrower for small signals because emitter resistance increases for small currents.

This section discusses about the op-amp based anti-logarithmic amplifier in detail. IC log ajplifier may cost about ten times the components needed to build a discrete-component log amp. Then a properly working multiplier should give you 20 volts out. Temperature compensation must correct both error sources. Then verify your design antipog with sweeping voltages on the inputs and compute the gain and offset errors vs input.

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logarthmic, anti logarthmic amplifiers | ECE Tutorials

Regression-based Active Learning for Fraud Detection. A logarithmic amplifieror a log amplifieris an electronic circuit that produces an output that is proportional to the logarithm of the applied input. Logarithmic amplifier operation The circuit diagram of logarithmic amplifier is as shown below logarithmic amplifier.

Using the concept of virtual short between the input terminals of an opamp the voltage at inverting terminal will be zero volts. V is voltage applied across diode; V t is the voltage equivalent of temperature. Please note that these amplifiers fall under non-linear applications. Matched temperature by thermal coupling is desired or minimize self heating for low T rise.

Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. D1 protects the base-emitter junction from excessive reverse voltages. The analysis is the same as above for the transdiode connection, but the logarithmic range is limited to four or five decades because maplifier base current adds to the collector current.


That means zero volts is applied at the non-inverting input terminal of the op-amp. 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.

Log And Anti Log Amplifiers

Alternatively, the log amp can be preceded by olg precision current inverter. Documents Flashcards Grammar checker. Using a p-n-p transistor changes the polarity of input signals acceptable but limits the logarithmic range because of the degraded performance of p-n-p transistors compared to n-p-n transistors www.

I know there is problem with the last stage, the last opamp should give me gain: To get the logarithm of a signal voltage use a Log amplifier. Gain of Anti log amplifier. Automated Classification of internet video content. Applying Antilog on both sides we get.