![]() ![]() Most older and a few current IC op amps have a separate null or trim pin input to which a corrective voltage can be applied. In applications that can’t tolerate such errors and drift, compensation methods have been devised. This drift is usually stated in microvolts per degree Celsius (µV/☌). In addition, the input offset voltage error varies with temperature, introducing further obfuscations of the true signal. The output, therefore, isn’t representative of the true input. However, in applications where very small input signals are to be amplified with very high gain, this unwanted error voltage is amplified along with the desired input. This error is usually very small, and in many applications, it can be ignored as it doesn’t cause any detrimental effects. This characteristic is caused by small differences in the input differential transistors’ or any related resistors. The most common and detrimental error is input offset voltage. Op amps are high-gain dc differential amplifiers that commonly have mismatched input components and device limitations that introduce error signals. A zero-drift amplifier is one whose output doesn’t change significantly as a result of the amplification of negative physical characteristics like input offset voltage. ![]()
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