effect of input voltage offset on the output voltage

Published:2013/6/25 22:24:00 Author:muriel | Keyword: effect , input voltage , output voltage | From:SeekIC

Voltage comparators are not perfect devices and their performance may suffer from the effects of a parameter known as the Input Offset Voltage. The Input Offset Voltage for many comparators is only a few millivolts and in most circuits can be ignored. Problems related to the Input voltage normally occur when the Input voltage changes very slowly. The net result of the Input Offset Voltage is that the output transistor does not fully turn on or off when the input voltage is close to the reference voltage. The following diagram attempts to illustrate the effect of the input offset voltage with a slowly changing input voltage. This effect increases as the output transistor current increases so keeping the value of RL high will help reduce the problem.



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