New logarithmic amplifier from TI. Free Technical Library News

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New logarithmic amplifier from TI

12.05.2007

Texas Instruments has introduced a new precision high-speed (1µs transient) logarithmic amplifier that produces an output voltage or current as the natural or decimal logarithm of the input voltage or current.

LOG114 has a dynamic range of 8 decades and implements the logarithm function without the use of external components. The LOG114 is specifically designed to amplify the photodiode output of fiber optic cables in communication systems. The LOG114 can also be used to measure absorbance in medical and industrial applications, and to match its input dynamic range to that of an ADC.

The QFN-16 package allows the amplifier to be used in compact plug-in modules and multi-channel systems. High speed and wide dynamic range (27 bit equivalent; 100 pA to 10 mA input) with high accuracy make the LOG114 suitable for laser control applications.

The amplifier has a built-in 2,5 V reference voltage source and two independent operational amplifiers, which allows you to organize offset, amplitude scaling, threshold detection, and some other functions. The LOG114 operates on a single +5V or dual +5V power supply over a temperature range of -5 to 75°C.

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Walking in nature is good for the brain 01.10.2022

Cities represent a radical new kind of environment that, despite its many benefits, often aggravates a person's mental health. Research has linked urban environments to an increased risk of anxiety, depression, and other mental health problems, including schizophrenia.

The solution to this problem has long been known: visiting the wild. Even short walks in the wild are associated with a range of mental and physical health benefits, including lower blood pressure, reduced anxiety and depression, improved mood, better concentration, better sleep, better memory, and faster injury recovery.

Numerous scientific studies point to this correlation, but scientists still cannot exactly explain what processes in the body affect the fact that people feel better in nature.

A good place to look for clues is the amygdala, a small structure in the center of the brain that is involved in stress processing, emotional learning, and the fight-or-flight response.

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MRI scans showed a decrease in amygdala activity after a walk in the woods, supporting the idea that nature can affect areas of the brain associated with stress. And obviously it can happen in as little as 60 minutes.

The participants who walked in the woods also reported more renewed attention and more enjoyment of the walk itself than those who walked in the city. This is consistent with MRI scans and preliminary studies.

The researchers also learned something interesting about the subjects walking around the city. Although the activity of their tonsils did not decrease, as in nature walkers, it also did not increase, despite spending an hour in a vibrant urban environment. Therefore, perhaps from a walk around the city the level of stress will not increase, but from being in nature it will definitely decrease.

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