0
Can back to back semiconductor diodes can be added as npn or pnp transistors?
Wiki User
∙ 11y ago
no, the shared base of a transistor between the emitter & collector must be thin to get the transistor effect. the thinner the better for high frequency transistors. this cannot be faked using individual discrete diodes.
Wiki User
∙ 11y ago
Add your answer:
Earn +20 pts
Why do you use a transistor?
Transistor is a semiconductor device used for amplify and switch electronic signals and electrical power. It is composed of semiconductor material with at least three terminals for connection to an external circuit.
Why dont we get the transister action by connecting two diodes back to back?
Because two diodes is not a transistor. There is an interaction between the junctions in the transistor, because of their proximity, that you don't get in the two diodes. The only use of modeling a transistor as two diodes back to back is to test a transistor with a multimeter as a quick go-nogo test for basic operability.
Can two diodes connected back-to-back produce a transistor?
No, two diodes cannot function as a transistor.The emitter and collector of a transistor have different and very specific doping profiles to optimize them for their functions, diodes don't.The base is a very very thin layer that both allows current carriers injected by the emitter to pass thru the base and be collected by the collector, and allows the transistor to operate at high frequencies (early junction transistors, a type called grown junction, had thick bases and could not function above audio frequencies), the diodes are physically separated with a long metal wire connecting them.
How does a quenching diode work?
Quenching diodes are used to protect the control circuit of a relay. Power is applied to a relay's coil to close it. When this power is released there is a backwards flowing pulse that can wipe out solid state devices like transistors, LEDs, chips, etc... The quenching diode is applied in parallel with the relay coil so that the cathode is on the positive side. During normal operation, the diode doesn't conduct and the relay operates normally. When the relay is switched off, the "reversed" back pulse is absorbed due to the low voltage drop of the diode which limits the spike.
How do you identify base collector and emitter of transistor?
It is possible with an ohmmeter usually the can has a tab signify emitter. some plastics devices have the emitter on the right lead looking at the flat part. using an ohmmeter you may check for the two diodes inside.
How many diodes in a transistor?
There are two semiconductor junctions. Transistors are designated as NPN or PNP and a diode is an NP or PN junction depending on direction of current flow. However, the function of a transistor is different than two back to back diodes.
How does common emitter transistor show more temperature variation than common base transistors?
A transistor is made up of two diodes back-to-back. In a common base circuit - the load is shared between two diodes
Why do you use a transistor?
Transistor is a semiconductor device used for amplify and switch electronic signals and electrical power. It is composed of semiconductor material with at least three terminals for connection to an external circuit.
Why dont we get the transister action by connecting two diodes back to back?
Because two diodes is not a transistor. There is an interaction between the junctions in the transistor, because of their proximity, that you don't get in the two diodes. The only use of modeling a transistor as two diodes back to back is to test a transistor with a multimeter as a quick go-nogo test for basic operability.
Can you make a transistor by connecting two diodes back to back?
Two diodes, whether or not discreet, cannot work together as a transistor. The diodes and transistor have different profiles to optimize them for their specific functions
Can a transistor be obtain by connecting the semiconductor diode back to back?
No.
How many diode makes one transistor?
When investigated with an ohm-meter, a transistor resembles two diodes connected "back-to-back". But you can't make a transistor by connecting two diodes back-to-back.
What is back to back diode?
A: Refers two two diodes connected as it say back to back for gates applications.
Why do you need to structure transistor as diode?
A transistor is not a diode. It is also not a pair of back to back diodes. Two diodes connected back to back will not function like a transistor because their junctions are not in close proximity like they are in a transistor. The only reason for "thinking" that a transistor is "like" a pair of back to back diodes is for purposes of quick go-nogo testing with a multimeter, but that will only assess open, short, and leakage status, as well as polarity, but not any of the more useful things, such as hFe.
How can you designed transistor using diode because no available transistor?
You cannot build a transistor with two diodes. Even though the static junction characteristics of a transistor "looks like" two back to back series diodes, there is a relationship between the two junctions that cannot be matched by just connecting two diodes together.
Can two diodes connected back-to-back produce a transistor?
No, two diodes cannot function as a transistor.The emitter and collector of a transistor have different and very specific doping profiles to optimize them for their functions, diodes don't.The base is a very very thin layer that both allows current carriers injected by the emitter to pass thru the base and be collected by the collector, and allows the transistor to operate at high frequencies (early junction transistors, a type called grown junction, had thick bases and could not function above audio frequencies), the diodes are physically separated with a long metal wire connecting them.
Which thyristor device has a gate electrode?
A: Without the gate there is only two diodes back to back. The gate is the turn on switch
