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The direct-coupled amplifier was influential in the development of Fairchild's uA709 operational amplifier by Bob Widlar, which Noyce knew about as he was one of the founders of Fairchild Semiconductors. The direct-coupled amplifier is also the basis for Philco's Mark I hearing aid, which used the circuit built with silicon alloy transistors.
However, unlike direct coupled designs, capacitively coupled designs do not have inherent DC blocking by virtue of their topology. Instead, DC voltage in the output section is blocked by an output coupling capacitor - typically a large-value (3000-6000μF) electrolytic capacitor - which is interposed between the amplifier's output section and ...
Direct coupled or Direct-coupled may refer to: Direct-coupled amplifier; Direct-coupled transistor logic; Direct coupled (applied to an engine), drives a machine directly without intervening belts, chains, or gears
Here the internal units or portions of the op-amp (like the input stage, voltage gain stage, and output stage) will be direct coupled and will also be used to set up the bias conditions inside the op-amp (the input stage will also supply the input bias to the voltage gain stage, for example).
The direct connection causes the bias circuits of adjacent stages to interact with each other. This complicates the design and leads to compromises on other amplifier parameters. DC amplifiers are also subject to drift requiring careful adjustment and high stability components. Where DC amplification is not required, a common choice is RC coupling.
Direct-coupled transistor logic (DCTL) is similar to resistor–transistor logic (RTL), but the input transistor bases are connected directly to the collector outputs without any base resistors. Consequently, DCTL gates have fewer components, are more economical, and are simpler to fabricate onto integrated circuits than RTL gates.