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Results tagged with semiconductors
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user 38098
Most generally a class of materials that are neither insulators or conductors in their natural state, but which can be manipulated via doping or electric fields to change their conduction state. Silicon, Germanium, and GaAs are some usual materials. The term is also used to speak about devices that are made from such materials, for example, a processor from Intel can be called a semiconductor.
2
votes
intrinsic semiconductor
I only think of diffusion current occurring for the following reasons:
A PN junction and depletion region. (Doesn't usually apply to intrinsics, almost by definition, though I suppose one could plac …
- 78.7k
3
votes
Calculate V for given circuit
Preface to Redrawing the Schematic
The first thing I do before attempting to analyze a circuit is to redraw that circuit. The process of just doing it helps me think and gather up a few details that I …
- 78.7k
3
votes
Accepted
P substrate has electrons?
What is conductivity? Part of the idea is the density of free electrons in the solid. Electrons are normally part of a neutral atom. But heat agitates the atoms and the vibrations can kick some of the …
- 78.7k
0
votes
Transistor in saturation mode
I'm not sure what to make of Tony's answer. But I'm not sure it answers your question, as you asked it.
Take a look at the following lateral planar BJT layout:
(Keep in mind that saturation isn't …
- 78.7k
2
votes
Voltage fluctuation due to AC in a half wave rectifier
So in the forward bias cycle from 0-0.7 v diode should not conduct?
Strictly speaking, diodes follow an exponential curve with respect to the voltage across them. So it still does conduct current wh …
- 78.7k
8
votes
BJT Early effect and the small signal model
I prefer to return back to the original papers when trying to explain (or understand) an effect. If you were taking a class in the 1960's, you'd be taught the details. But modern teaching has so much …
- 78.7k
3
votes
Accepted
bjt design question
It's been long enough. You haven't added that much, but I suppose it is more because you have no clue about where to start. I suspect I also don't have a clue, so you really shouldn't feel badly about …
- 78.7k
6
votes
Accepted
BJT: definition of "edge of saturation"
It has to do with practical teaching vs theoretical, I suppose. For Silicon PN junctions, pretty much anything below a forward-biased magnitude of \$400\:\text{mV}\$ produces currents that are typical …
- 78.7k
0
votes
Accepted
Question about transitor NPN [ALFA;Strange configuration;Exit characteristic]
1
You don't need to subtract \$I_\text{B}\$ because the term \$\alpha\$ already takes that subtraction into account: $$\alpha=\frac{I_\text{C}}{I_\text{E}}=\frac{I_\text{E}-I_\text{B}}{I_\text{E}}=1-\ …
- 78.7k
4
votes
Accepted
Modelling and simulating multiple-collector/emitter BJTs
I'm a hobbyist. So keep in mind my own limitations as I write here. And it may have helped me (or others) if you'd provided a specific schematic to discuss. (Update: thanks for adding a schematic!)
S …
- 78.7k
1
vote
Transistor: Getting “incorrect” graph for input voltage to output voltage
Below is a simplified diagram of the PNP BJT in active mode, with the relative thicknesses exaggerated in order to make it more readable. This image is taken from Jacob Millman's "Microelectronics: Di …
- 78.7k
28
votes
Can a thyristor be built from two transistors?
There are two easy kinds of thyristors made out of two BJTs. One is the SCR and the other is a PUJT. (The PUJT will use the base of \$Q_2\$ instead of the base of \$Q_1\$ as the gate -- see circuits b …
- 78.7k