Advantages
The advantage of direct coupling is very good low frequency response, often from DC (if the input/output coupling capacitors are not used) to the highest operating frequency that the system will allow. Most industrial applications that require monitoring of slowly changing signals (such as those from thermistors, thermocouples, etc.) must have a very good DC amplification with minimum offset errors and hence they have to be directly coupled throughout by default, and have offset correction or trimming incorporated into them.
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