What is log and antilog amplifier?
What is log and antilog 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 is the use of log and antilog amplifier?
Anti-Logarithmic Amplifier or Exponential Amplifier Antilog amplifier does the exact opposite of a log 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.
What is meant by logarithmic amplifier?
From Wikipedia, the free encyclopedia. A log amplifier is an amplifier for which the output voltage Vout is K times the natural log of the input voltage Vin. This can be expressed as, where Vref is the normalization constant in volts and K is the scale factor.
What is the function 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.
What is the disadvantage of log antilog amplifier?
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. Explanation: In an ideal frequency doubler, same frequency is applied to both inputs.
What is the most important rule of amplifier?
As a summary, here are the “golden rules” of op-amps: The op-amp has an infinite open loop gain. Ideally, this means that any voltage differential on the two input terminals will result in an infinite voltage on the output. But in real op amps, the output voltage is limited by the power supply voltage.
What is the disadvantage of log Antilog multiplier Y?
What is the antilog of 3?
1000
What is Antilog? The antilogarithm (also called an antilog) is the inverse of the logarithm transform. Since the logarithm (base 10) of 1000 equals 3, the antilogarithm of 3 is 1000.
What are anti log and logarithmic amplifications called?
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. This chapter discusses about the Logarithmic amplifier and Anti-Logarithmic amplifier in detail.
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 does a logarithmic amplifier work in a feedback loop?
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. When a diode is connected in the feedback loop of an inverting amplifier, the output voltage is a logarithmic function of the input voltage.
What is the necessary condition for a log amplifier?
The necessary condition of the log amplifier to work is that the input voltage always must be positive. It can be seen that Vout = – Vbe. Since the collector terminal of the transistor is held at virtual ground and the base terminal is also grounded, the voltage-current relationship becomes that of a diode and is given by,