Hi everyone,
I'm working on a lab that uses a 1N4733 Zener diode.
Based on Shockley's diode equation which is Id = Is* e^(Vd/Vth), I'm supposed to figure out the thermal voltage of the diode. Id is the diode current, Vd is diode voltage, Vth is thermal voltage. Is is the reverse leakage current.
I have a whole table of measurements I made using a multimeter for the diode current and the voltage across the diode. This includes both reverse and forward bias orientations.
The thermal voltage is supposed to be a constant at a given temperature, but I can't seem to get anything constant for both forward and reverse. They are also orders of magnitude off from the expected value of 26mV.
I solved for Vth = Vd/ ln((Id/Is).
Should I be able to use any measurement to calculate the thermal voltage? What might I be doing wrong?
Thank you!
I'm working on a lab that uses a 1N4733 Zener diode.
Based on Shockley's diode equation which is Id = Is* e^(Vd/Vth), I'm supposed to figure out the thermal voltage of the diode. Id is the diode current, Vd is diode voltage, Vth is thermal voltage. Is is the reverse leakage current.
I have a whole table of measurements I made using a multimeter for the diode current and the voltage across the diode. This includes both reverse and forward bias orientations.
The thermal voltage is supposed to be a constant at a given temperature, but I can't seem to get anything constant for both forward and reverse. They are also orders of magnitude off from the expected value of 26mV.
I solved for Vth = Vd/ ln((Id/Is).
Should I be able to use any measurement to calculate the thermal voltage? What might I be doing wrong?
Thank you!