How op-amp can be used as an AntiLog amplifier?
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. In the circuit shown above, the non-inverting input terminal of the op-amp is connected to ground.
What are the applications of log and AntiLog amplifier?
Antilog amplifiers along with log amplifiers are used to perform analogue computations on the input signals. The circuit of an antilog amplifier using op-amp is shown in the figure below.
How op-amp provides the log value of the input?
An operational amplifier in which the output voltage of the amplifier (V0) is directly proportional to the natural logarithm of the input voltage (Vi) is known as a logarithmic amplifier. Basically, the natural logarithm of the input voltage is multiplied by a constant value and produced as output.
What is comparator circuit?
A comparator circuit compares two voltages and outputs either a 1 (the voltage at the plus side; VDD in the illustration) or a 0 (the voltage at the negative side) to indicate which is larger. Comparators are often used, for example, to check whether an input has reached some predetermined value.
What is the application of log amplifier?
In general, the principal application of log amps is to measure signal strength, as opposed to detecting signal content. The log amp’s output signal, which can represent a many-decade dynamic range of high-frequency input signal amplitudes by a relatively narrow range, is typically used to regulate gain.
Which of the following functions does the AntiLog computation required to perform continuously with log amps?
1. 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. 2.
What is log amplifier application?
What technique is used in Millers Theorem?
1. What technique is used in Millers Theorem? Explanation: In Millers Theorem, we use the equivalent two – port network of the given electrical circuit. We divide the circuit into two parts, each part representing a different port for easier analysis of the circuit.
Can a log amplifier be used as an Antilog Amplifier?
The circuit of an antilog amplifier using op-amp is shown in the figure below. It is noted that by exchanging the positions of the transistor and the resistor, the log amplifier can be made to work as antilog amplifier. The base-collector voltage of the transistor is maintained at ground potential, from the virtual ground concept.
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 −
Is the output of an anti log amplifier proportional to the output?
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. This section discusses about the op-amp based anti-logarithmic amplifier in detail.
How is negative feedback achieved in an Antilog Amplifier?
In the antilog amplifier, the input signal is at the inverting pin of the operational amplifier, which passes through a diode. As observed in the circuit shown above, the negative feedback is achieved by connecting the output to the inverting input terminal.