Log amplifier
Electrical circuit / From Wikipedia, the free encyclopedia
Dear Wikiwand AI, let's keep it short by simply answering these key questions:
Can you list the top facts and stats about Log amplifier?
Summarize this article for a 10 year old
A log amplifier, also known as logarithmic amplifier or logarithm amplifier or log amp, 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.
The log amplifier gives an output voltage which is proportional to the logarithm of the applied input voltage. To design a log amplifier circuit, high performance op-amps like LM1458, LM771, LM714 are commonly used and a compensated log amplifier may include more than one. In some situations, especially in RF domain, monolithic log amplifiers are also used to reduce number of components and space used, as well improve bandwidth and noise performance.
The log amplifier's operation can be inverted by an exponentiator, such as an op-amp configured for exponential output.[1]