please tell me what is the difference between static and dynamic char of bjt.?
2007-04-15 02:25:24 · 5 answers · asked by nishit 2 in Science & Mathematics ➔ Engineering
Static - DC signal
Dynamic - AC signal
2007-04-15 02:55:44 · answer #1 · answered by John S 6 · 0⤊ 0⤋
The transconductance of a bjt can be assumed to be constant over a very small (or 'static') range, but it's not really linear (since the base-emitter junction, like any other junction, has a square law conductance curve) and so the 'dynamic' transconductance' is an average over the entire operating load line.
Also, the base-collector junction (since it is reverse biased) has a very real amount of capacitance which acts as a negative feedback at higher frequencies.
In most applications, the difference between the static and dynamic characteristics of a bjt aren't large enough to worry about. But, if you're trying to get that THD number down to .01% or less, or if you're working with very high-frequency (or high-speed) circuits, they can make a difference and you have to start adding external circuitry to compensate for them.
HTH
Doug
BTW (for Billy Butthead) : bjt means bipolar junction transistor âº
2007-04-15 02:58:55 · answer #2 · answered by doug_donaghue 7 · 0⤊ 0⤋
I can usually come up with an answer for anything but this has me stymied.
However one is in a state of change and the other remains the same.
Bjt,eh.
2007-04-15 02:44:49 · answer #3 · answered by Billy Butthead 7 · 0⤊ 0⤋
What is meant by "char of bjt"?
2007-04-15 02:56:23 · answer #4 · answered by Mark 6 · 0⤊ 0⤋
Chellame...
2007-04-15 03:09:28 · answer #5 · answered by Anonymous · 0⤊ 0⤋