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Tunnel diode logic TDL Exactly the same as diode logic but can perform at a higher speed. Core diode logic CDL Performed by semiconductor compuertas electronics and small ferrite toroidal cores for moderate speed and moderate power level.
Direct-coupled transistor logic DCTL Uses transistors switching between saturated compuertas electronics cutoff states to perform logic. The transistors require carefully controlled parameters.
Logic gate - Wikipedia
Economical because few other components are needed, but tends to be susceptible compuertas electronics noise because of the lower voltage levels employed. Often considered to be the father to modern TTL logic.
Current-mode logic CML Uses transistors to perform logic but biasing is from constant current compuertas electronics to prevent saturation and allow extremely fast switching. Has high noise immunity despite compuertas electronics low logic levels. Quantum-dot cellular automata QCA Uses tunnelable q-bits for synthesizing the binary logic bits.
The electrostatic repulsive force in between two electrons in the quantum dots assigns the electron configurations that defines high-level logic state 1 or compuertas electronics logic state 0 under the suitably driven polarizations.
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This is a transistorless, currentless, junctionless binary logic synthesis technique allowing it to have very fast operation speeds.
Electronic logic gates differ significantly from their relay-and-switch equivalents. They are much faster, consume much less power, compuertas electronics are much smaller all by a factor of a million compuertas electronics more in most cases.
Also, there is a fundamental structural difference.
The switch circuit creates a continuous metallic path for current to flow in either direction between its input and its output. The semiconductor logic gate, on the other hand, acts as a high- gain voltage amplifiercompuertas electronics sinks a tiny current at its input and produces compuertas electronics low-impedance voltage at its output.
It is not possible for current to flow between compuertas electronics output and the input of a semiconductor logic gate. Another important advantage of standardized integrated circuit logic families, such as the and families, is that they can be cascaded.
This means that the output of one gate can be wired to the inputs of one or several other gates, and so on. Systems with compuertas electronics degrees of complexity can be built without great concern of the designer for the internal workings of the gates, provided the limitations of each integrated circuit are considered.
The output of one gate can only drive a finite number of inputs to other gates, a number compuertas electronics the ' fan-out limit'. Also, there is always a delay, called the ' propagation delay ', from a change in input of a gate to the corresponding change in its output. When gates are cascaded, the total propagation delay is approximately the sum of the individual delays, an effect which can become a problem in high-speed circuits.
Compuertas electronics delay can be caused when a large number of inputs are connected to an output, due to the distributed capacitance of all the inputs and wiring and the finite amount of current that each output can provide. History and development[ edit ] The binary number system was refined by Gottfried Wilhelm Leibniz published ininfluenced by the ancient I Ching 's binary system.
In an letter, Charles Sanders Peirce described how logical operations could be carried out by electrical switching circuits. Compuertas electronics De Forest 's modification, inof the Fleming valve can be used as a logic compuertas electronics.