Discussion
Why are direct-coupled stages used in integrated circuits?
Answer: C
A microfarad occupies an impossible area in silicon, so integrated designs couple directly and pay for it with the need to handle direct offsets and drift throughout. High-frequency response is unaffected by coupling method, matching is a separate advantage, and bias is still needed. What a technology cannot make cheaply shapes its circuits more than what it can, and the absence of large capacitors is the clearest example in analogue integration. The parameter that varies and the parameter that does not are worth naming before any substitution is attempted.
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