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How does emitter coupled logic works?


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Answered 2009-10-29 09:33:45

In electronics, emitter-coupled logic, or ECL, is a logic family in which current is steered through bipolar transistors to prevent saturation.


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The main limitation on the use of Emitter Coupled Logic is that it is very very power hungry, so the devices tend to require a significant cooling system to remove the waste heat. But in most systems where the speed advantage offered by Emitter Coupled Logic is deemed a necessary requirement, this is usually considered a minor price to pay.

This is used in order to amplify the different digital sounds that are coming through. A disadvantage may include that it can get confusing with all of the sounds.

A logic family is the type of components used to make logic gates on an IC. Some include: RTL: Resistor-Transistor Logic DL: Diode logic TTL: Transistor-Transistor Logic - used in 7400 series chips CMOS: Complimentary Metal Oxide - used in 4000 series chips ECL: Emitter-coupled Logic RTL and DL are rarely if ever used for actual chips. CMOS chips can be destroyed by too much static electricity.

what happens if we remove Rc in RC coupled amplifier

The emitter resistor is connected to ground(in the case of an rc coupled amplifier).Also input signal applied at the base is grounded.Then the emitter resistor forms a feedback to the input signal (through the ground return path).So emitter resistor is also called feedback resistor.

No. A diode is not like a transistor, and a transistor is not like (two) diode(s). Taken in isolation, the emitter-base and collector-base junctions of a transistor appear to be diodes, but they are coupled together so that the base-emitter current affects the collector-emitter current.

ECL or emitter coupled logic is faster than TTL type logic because the switching transistors do NOT go into saturation in either the on or off state. The switching time from saturation in a high output to saturation in a low state like TTL requires that the junction capacitance be overcome and that the charge in the saturated junction get swept out. ECL is sensitive to a threshold level only.

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Don't know much on the subject, but I been looking for logic works, and apparently Aristotle's students called "Organon" the compilation of all his logic works

The emitter bypass capacitor, in a typical common emitter configuration, increases gain as a function of frequency, making a high pass filter. Removing the capacitor will remove the gain component due to frequency, and the amplifier will degrade to its DC characteristics.

The standard analog multiplier circuit (i.e. multiplying two analog signals to generate a product analog signal) sums the logs of the inputs then takes the antilog to form the output. The log and antilog functions are approximated using the base-emitter curve of transistors. The rest of the circuit is opamps, which have emitter coupled differential transistor amplifiers at their core. This however is limited to positive values only, and is called a one quadrant multiplier. Perhaps you are asking instead about a type of analog multiplier using two cross-connected emitter coupled differential transistor amplifiers and several constant current sources for bias. The main advantages of these is they can correctly handle negative numbers, and are thus called four quadrant multipliers, and they are almost trivial to integrate compared to the opamp version.

The common emitter configuration works best because of the way the segments of transistors are biased, and the fact that there are more carriers in the collector than in the emitter.

Direct coupled transistor logic is a type of transistor that is more economical to use then integrated circuits. These transistors can be found in many types of wires such as the ones that control cable internet.

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A: When a signal is not amplified but simply taken from an emitter the reason is that the emitter will provide better current capabilities

With a common emitter amplifier it's the emitter that is usually grounded.

By just connecting two BJT such that both gets inputs at the BASE and emitter of one is connected to the collector of another BJT. Then the upper transistor should provide potential about 15V at the collector and the emitter of of the lower BJT is grounded as well as taken output. This will give you results according to the truth table of AND logic gate but mind it that result will not in 0 and 1 rather in high and low voltages.

DHPT in full is Double Heterostructure Photo Transistor. DHPT works by interchanging the double heterostructure's emitter and collector all through when the transistor is in use.

Depending on context, it could be an infra-red emitter. An emitter that emits at a wavelength longer than that of visible red. infra red emitter is a special pn juction device in which emitter region emits infrared rays

The output of the common emitter amplifier is inverted because, as base-emitter current increases, so does collector-emitter current, which pulls the collector towards the emitter, i.e. down, making it an inverting amplifier.

Transistors are Bi-polar PN Junction devices (BJT's) which switch or amplify current and come in PNP and NPN types which dictate base to emitter bias conditions. BJT's commonly have three terminals b (base), e (emitter), and c (collector) which by internal design provide an hFE or dc current gain which is needed to produce larger currents from varying smaller currents. There are two p-n junctions : base/emitter and base/collector with BJT transistors. For this reason transistors are commonly used as simple current switches or amplifiers. Without the transistor there would essentially be no computers since there would have never been any mechanism by which to construct logic devices like OR Gates, AND Gates, NAND Gates, Flip-Flops, Inverters and Buffers. Transistor Switches In a simple switch application the transistor is placed in cutoff mode (off) or saturation (on). The on/off condition of a transistor is affected by a base-emitter bias versus the dc hFE. In a simple logic application where a digital signal is produced the NPN type transistors base-emitter bias current is high enough to saturate the transistors emitter-collection region with current. When the emitter collector region becomes saturated (both junctions forward-biased) a logic low (Vce =0) will be produced across the collector emitter terminals since current is flowing. By simply removing or lowering the base/emitter forward-bias current the transistor will move from saturation (Vce=0) to cutoff where the Vce is equal to Vcc.

I think you mean a common emitter amplifier, which is an amplifier of voltage. Emitter-follower or common collector amplifiers are used to match impedances, or to amplify power or current. The emitter-follower is a type of common emitter circuit that has a resistor between the emitter and ground. The output signal is taken from the point between the emitter and its resistor.

The emitter resistor in a common emitter configuration provides negative feedback to the transistor, reducing both its voltage gain and distortion.

It is a good emitter, as you can not have a good absorber, which isn't a good emitter. Dark, Matt surfaces are good emitters and absorbers e.g. a saucepan.

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