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Power/Alternative Energy  

Rail-to-rail amp extends light sensor's resolution, range

Posted: 24 Apr 2009     Print Version  Bookmark and Share

Keywords:EL8178  Light sensors  Rail-to-rail op amps 

Light sensors are appearing in every sort of consumer application, aiding in aspects like power conservation. Since a wide range of products are portable, they use battery power and are therefore configured for single-supply operation. Single-supply operation introduces limitations on analogue circuitry. One of the most obvious trade-offs is reduced input voltage range. Upgrading to a rail-to-rail amplifier will restore this sacrifice.

Rail-to-rail op amps, like the EL8178, include dual input pairs to allow the input signal to travel the full power supply range (and a bit beyond.) For maximum resolution on the light sensor, the non-inverting terminal is biased at the supply voltage. This accommodates the complete response of the light sensor, improving the output dynamic range as much as 45 per cent.

View the PDF document for more information.





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