is known as input offset error.

Error correction

Temperature drift and device mismatches are the major causes of offset errors, and circuits employing direct coupling often integrate offset nulling mechanisms. Some circuits (like power amplifiers) even use coupling capacitors—except that these are present only at the input (and/or output) of the whole system but not between the individual circuit units inside the system.

Advantages

The advantage of direct coupling is very good low frequency response, often

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