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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.
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 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
Transistor amplifiers (3 C, 4 P) V. Valve amplifiers (31 P) Pages in category "Electronic amplifiers" ... Direct-coupled amplifier; Direct coupling; Distributed ...
Figure 2: A negative-feedback amplifier. The circuit can be explained by viewing the transistor as being under the control of negative feedback.From this viewpoint, a common-collector stage (Fig. 1) is an amplifier with full series negative feedback.
Coupling can be deliberate as part of the function of the circuit, or it may be undesirable, for instance due to coupling to stray fields. For example, energy is transferred from a power source to an electrical load by means of conductive coupling , which may be either resistive or direct 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.