Can a Diode be used as a Resister
Can a Diode be used as a Resister
(OP)
Can a diode be used as a resistor?if yes then how if no then what are the problems.Please help.Thanks in advance
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
Can a Diode be used as a Resister
|
RE: Can a Diode be used as a Resister
RE: Can a Diode be used as a Resister
For example, a diode I use a lot is a BAV99. At 1ma the voltage drop across it is 0.715 volts. At 10ma it is 0.855 volts. At 50ma it is 1.000 volts. And at 150ma the voltage drop is 1.250 volts.
This should give you an understanding of using diodes to reduce your voltage. I use them this way in lots of designs.
RE: Can a Diode be used as a Resister
As an expansion to the previous diode comments, the diode current is proportional to Is*exp(Vd/kT), so if you need a one-directional nonlinear resistor, a diode is the ticket.
TTFN
RE: Can a Diode be used as a Resister
RE: Can a Diode be used as a Resister
Ben Roberts
Broadcast Engineer
Sentient being.
RE: Can a Diode be used as a Resister
RE: Can a Diode be used as a Resister
RE: Can a Diode be used as a Resister
rd(ohms) ~= 26mV/Id(mA) at room temperature, and has a negative temp coefficient of -2.2mV/degC for silicon.
Example if the diode forward current = 1mA, then rd ~= 26ohms and at 0.1ma it = 260 ohms.
These are approximations but quite close enough for most work.
RE: Can a Diode be used as a Resister