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Diode logic (or diode-resistor logic) constructs AND and OR logic gates with diodes and resistors. An active device ( vacuum tubes with control grids in early electronic computers , then transistors in diode–transistor logic ) is additionally required to provide logical inversion (NOT) for functional completeness and amplification for voltage ...
Diode–transistor logic (DTL) is a class of digital circuits that is the direct ancestor of transistor–transistor logic. It is called so because the logic gating functions AND and OR are performed by diode logic , while logical inversion (NOT) and amplification (providing signal restoration) is performed by a transistor (in contrast with ...
Various semiconductor diodes. Left: A four-diode bridge rectifier.Next to it is a 1N4148 signal diode.On the far right is a Zener diode.In most diodes, a white or black painted band identifies the cathode into which electrons will flow when the diode is conducting.
Diode–transistor logic (DTL) was used in the IBM 608 which was the first all-transistorized computer. Early transistorized computers were implemented using discrete transistors, resistors, diodes and capacitors. The first diode–transistor logic family of integrated circuits was introduced by Signetics in 1962.
Diode logic: DL: Tunnel diode logic: TDL: Exactly the same as diode logic but can perform at a higher speed. [failed verification] Neon logic: NL: Uses neon bulbs or 3-element neon trigger tubes to perform logic. Core diode logic: CDL: Performed by semiconductor diodes and small ferrite toroidal cores for moderate speed and moderate power level ...
A diode-OR circuit is used in electronics to isolate two or more voltage sources. There are two typical implementations: There are two typical implementations: When a DC supply voltage needs to be generated from one of a number of different sources, for example when terminating a parallel SCSI bus, a very simple circuit like this can be used:
In a diode OR logic gate, diode switches are connected so that they act as normally open switches: if the input voltage is high (input logical 1), the according diode switch is closed; if the input voltage is low (input logical 0), the diode switch is open. It is obvious, there is no problem to understand it in the case of a diode OR gate.
A wired logic connection is a logic gate that implements boolean algebra (logic) using only passive components such as diodes and resistors. A wired logic connection can create an AND or an OR gate. Limitations include the inability to create a NOT gate, the lack of amplification to provide level restoration, and its constant ohmic heating for ...
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