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Results tagged with transistors
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user 688
A transistor is a semiconductor device that can amplify signals and switch power. The types that are used most are BJT (Bipolar Junction Transistor), UJT (Unijunction Transistor), and MOSFET (FET, for Field Effect Transistor).
1
vote
Accepted
What quantity is the operating point?
Since the transistors have large signal non-linear mathematical models that are non-linear, when you use the formulas for AC analysis and plug in the operating point values, most (if not all) of these …
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5
votes
What exactly is "signal swing"?
"Signal swing" simply refers to the excursions of its value in time. The units of this value can be voltage, or current, or frequency, etc., depending on the nature of the signal.
So if you have a …
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1
vote
What is voltage gain of a transistor amplifier and how is it affected by frequency?
From a very general perspective, the bandwidth limitation comes from the fact that any transistor will have a small capacitance between any of its terminals. These capacitances can be either parasiti …
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12
votes
Accepted
Does this circuit regulate current?
It is a current limiter, and the current limit is set by the 12 ohm resistor. The idea is that when enough current flows through that resistor, Q2 is turned on, pulling down the base of Q1, "strangli …
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3
votes
FET - Source follower utilizing current source to lower voltage offset
Nice circuit. To answer your question:
First of all lets agree on the basics: This kind of FET conducts when \$V_{GS}\$ is zero, and the current diminishes when the gate starts being negative with r …
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4
votes
Transistor question and is my circuit safe for Raspberry-Pi?
Put a resistor at the base of Q2 because it is required for D1 to turn on, otherwise it will suck up all the current that Q1 can provide and the voltage will not rise much more than 0.7V.
As it sta …
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6
votes
Bootstrap circuit function
Your preoccupation is well justified: How to turn on the high side N-MOS if we need a very high voltage at the gate?
At some point someone had the brilliant idea of first charging a capacitor on a …
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3
votes
NPN Transistor in common collector configuration, Vout varies
First of all, I'm going to assume your complete circuit looks like this:
[BTW, you should post your complete circuit if you expect to get any meaningful answers.]
Secondly, the unity voltage gain …
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