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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Home Questions Tags Users Unanswered. Leave a Reply Cancel reply Your email address will not be published. Gain of logarithmic amplifier. Sign up using Email and Password. I’m trying to build an analog multiplier that takes any two voltages and produces the product for them This is the basic layout of the circuit: It is obvious from the circuit shown above that negative feedback is provided from output to inverting terminal.

Since the non inverting terminal of opamp is at ground potential. Post as a guest Name.

Logarithmic amplifier operation The circuit diagram of logarithmic amplifier antklog as shown below logarithmic amplifier. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Your email address will not be published. This is the basic layout of the circuit: Then verify your design specs with sweeping voltages on the inputs and compute the gain antklog offset errors vs input.

Company Table Recruiting Disciplines. IC log amps may cost about ten times the components needed to build a discrete-component log amp.

### Linear Integrated Circuits Applications Log And Anti Log Amplifiers

This chapter discusses about the Logarithmic amplifier and Anti-Logarithmic amplifier in detail. Hence applying KCL at inverting terminal of opamp, we get. Very similar question from a month ago: Constant terms are omitted for simplicity. An anti-logarithmic amplifieror an anti-log amplifieris an electronic circuit that produces an output that is proportional to the anti-logarithm of the applied input.

Alternatively, the log amp can be preceded by a precision current inverter. Tony EE rocketscientist 62k 2 21 A logarithmic amplifieror a log amplifieris an electronic circuit that produces an output that is proportional to the logarithm of the applied input.

### Log and AntiLog Amplifiers

So, the voltage at the inverting input terminal will be zero volts. 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.

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Such circuit techniques are used in integrated log amps: It is called four-quadrant since inputs and output can be positive or negative. V is voltage applied across diode; V t is the voltage equivalent of temperature.

Ziad Could this be used to perform division if you used a differential amplifier instead of a summing amplifier?

## Log and AntiLog Amplifiers

Observe that the left amplidier side terms of both equation 1 and equation 3 are same. Then a properly working multiplier should give you 20 volts out.

A simple Anti log amplifier is shown below. This section discusses about the op-amp based anti-logarithmic amplifier in detail.

The final output is developed by an inverting amplifier with a voltage gain of —K2. That means zero volts is applied at the non-inverting input terminal of the op-amp. In the above circuit, the non-inverting input terminal of the op-amp is connected to ground.