That's true for N-channel JFETs.....................................
JFETs are symmetrical devices with conventional current flowing from drain to source (electrons flow in the opposite direction).
It doesn't; it acts like a FET.How does FET work as Voltage Variable Resistor?
The V/I curve of a JFET is not like that of an NFET or PFET.There is an old application note by National Semiconductors on JFETs. Amongst other uses it shows how to make them acting as variable resistors.
Hola Mike. Is the above a reply to my post?The V/I curve of a JFET is not like that of an NFET or PFET.
The JFET is just a bar of silicon with a P/N junction alloyed onto it - if you increase the reverse bias on that junction, the electric field spreads the depletion region further across the bar of silicon, eventually you reach a condition known as "pinch off" - which is just what it says, the electric field/depletion region has pinched off the conducting channel.How does FET work as Voltage Variable Resistor?
I would also like to know about working of Automatic Gain Control(AGC).
Is there any other application of FET which uses its ohmic characteristic region?
Thank you.
Good catch, thanks! It's so rare that I use a PFET, that I got ahead of myself.That's true for N-channel JFETs.
The current would flow in the opposite direction for P-channel JFETs of course.
Lately it has become fashionable to use MOSFETs the wrong way round to serve as polarity protection diode.Good catch, thanks! It's so rare that I use a PFET, that I got ahead of myself.
by Jake Hertz
by Duane Benson
by Aaron Carman