# What is logarithmic and Antilogarithmic amplifier?

## What is logarithmic and Antilogarithmic amplifier?

Advertisements. 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.

## What does a logarithmic amplifier do?

What logarithmic amplifiers do. Log amps are non-linear, analog amplifiers that produce an output that is the logarithm of the input signal or the signal’s envelope. They compress input signals having a large dynamic range into output signals with a fixed amplitude range.

Why is diode used in log amplifier?

The simple logarithmic amplifier uses a junction diode as a nonlinear element. In a forward-biased diode, the voltage drop across the diode varies proportionally to the log of the current through it.

### What is instrumentation amplifier explain with block diagram?

Instrumentation amplifier is a kind of differential amplifier with additional input buffer stages. The addition of input buffer stages makes it easy to match (impedance matching) the amplifier with the preceding stage. Instrumentation are commonly used in industrial test and measurement application.

### What is the difference between linear and nonlinear op-amp?

Answer: The output voltage or current which is directly proportional to either input voltage or current are called LINEAR Op-Amp Circuits. A NON LINEAR OP-Amp is one in which the output signal is not directly proportional to the input signal.

What is the output of Logarithmic amplifier?

1)Log Amplifier 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.

#### What is the disadvantage of log and antilog multiplier?

What is the disadvantage of log-antilog multiplier? Explanation: Log amplifier requires the input and reference voltage to be of the same polarity. This restricts log-antilog multiplier to one quadrant operation.

#### What is instrumentation amplifier PDF?

Instrumentation amplifiers (in-amps) are circuit elements designed to allow users to extract and amplify the difference between two signals or sources. One could use an operational amplifier, but this introduces several potentials for error and/or difficulties in design.

How do you find the output voltage of an instrumentation amplifier?

Vout = (R3/R2)(Vo1-Vo2)

1. (Vo1-Vo2)/(2R1+Rgain) = (V1-V2)/Rgain
2. i.e. Vout = (R3/R2){(2R1+Rgain)/Rgain}(V1-V2)
3. The above equation gives the output voltage of an instrumentation amplifier. The overall gain of the amplifier is given by the term (R3/R2){(2R1+Rgain)/Rgain}.

## What is the difference between operational amplifier and instrumentation amplifier?

Instrumentation amplifiers (INAs) are related to operational amplifiers (op amps), since they are based on the same basic building blocks. But an INA is a specialized device, designed for a specific function, as opposed to a fundamental building block.

## What is the main difference between linear and non linear circuits?

If you graph the output signal versus the input signal for a linear circuit, then the graph will be a straight line for all input signal level. With a nonlinear circuit, the output will not be a straight line. Instead, the output will be a curve.

What is the difference between linear and non linear characteristics?

If any of the equation is a straight line represented in the graph, then it is a linear. If the equation is a curved line, then it is nonlinear.

### Which function does the antilog computation to perform continuously with log amps?

Which of the following functions does the antilog computation required to perform continuously with log-amps? Explanation: Log-amp can easily perform function such as In(x), Log(x), Sinh(x) to have direct dB display on digital voltmeter and spectrum analyser.

### Why inductors are not preferred for audio frequency?

Why inductors are not preferred for audio frequency? Explanation: At audio frequencies, inductor becomes problematic, as the inductors become large, heavy and expensive. Sanfoundry Certification Contest of the Month is Live.

What is the difference between logarithmic amplifier and Antilog Amplifier?

The logarithm of any number is the power that has such a number at the base that results in this number. The results generated by the logarithmic or log amplifier is directly proportional to the log taken of the input provided while the output pf the antilog amplifier is inverse of the input.

#### How does an op-amp based anti-logarithmic amplifier work?

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. The circuit diagram of an op-amp based anti-logarithmic amplifier is shown in the following figure −

#### How to obtain the antilog from logarithm?

To obtain the antilog you should take the exponential of the logarithm. The antilog amplifier is created by linking the transistor or diode at input according to the below-given configuration. The exponential formula is also applicable to the base-emitter pn junction. The output voltage is found through the current or feedback resistance.

What is a factor in a log amplifier?

The factor in a log amplifier is a component that shows logarithmic features which when exits in the feedback loop of the operational amplifier causes a logarithmic response. It indicates that out signal is a function of the logarithm taken of the input signal and can be defined by this below-given equation.