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Is the vi characterreistics curve of a pn diode is linear or exponential?
Wiki User
∙ 12y ago
A diode has a fixed voltage drop (c), and if the voltage is less than that, no (or very little) current flows. Once the voltage increases above the voltage drop, the current increases exponentially as the voltage increases. A function that models this is:
I = exp(b*(V-c))
where V is the voltage, I is the current, c is the voltage drop and b is a parameter that determines how fast the current increases; the value of b varies from one diode to another
Wiki User
∙ 12y ago
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Is Voltage-Current relationship of diode Linear or Exponential?
It closely approximates an exponential function.
What portion of the volt-ampere characteristics of the diode is linear when is forward biased?
Below the diode's Forward Voltage (Vf) typically 0.7V, the curve is at (roughly) zero. At around 0.5 it begins to curve upward, and at around 0.7V, the voltage drop is almost constant (the curve heads straight upwards to infinity). See link.
Is zener diode a linear device?
Zener diode is not a linear device... it is non-linear one. Since linear devices are those devices which have linear characteristics(V-I CHAR.), or follows the Ohm's law i.e. voltage is directly proportional to current. but in case of Zener diode ohm's law fails down. the V-I char. in both forward biased & reverse biased condition is non-linear. So. Zener diode is non-linear device
Is rectifier a non linear device?
diode is nonlinear device,so device from diode is also nonlinear
What a few example of non linear resistance?
Two examples of non linear resistance is a diode and a light bulb.
Is Voltage-Current relationship of diode Linear or Exponential?
It closely approximates an exponential function.
What is piecewise linear model?
A piecewise linear (PWL) model can be used to simplify a problem, by replacing a complex model with on that is made up of simpler (linear) pieces. For example, the IV curve for a diode is Id = Is( exp(Vd/n*Vt) - 1). Quite messy. We can instead represent the curve by two pieces. One where the current is zero from 0V, to arround 0.5-0.7V. From here, we approximate the exponential curve with a linear relationship. This linear region is typically fixed on a point on the exponential curve known as the operating point, Q. See link.
How does a PN junction diode acts as a switch?
A diode is voltage and current sensitive it follows an exponential curve and lower then .6v it is considered off and above .6v is considered on.
What will happen if you double the voltage across a diode?
basically a diode flows an exponential curve Vs current if you try to double the voltage drop by increasing the voltage it should self destruct
What is ac and DC resistance of a diode?
diodes follow an exponential curve meaning non linear in nature. by using Boltzmann formula an impedance can be calculated. That would be the AC Resistance the dc resistance on any device is the voltage drop divided by the dc current.
What portion of the volt-ampere characteristics of the diode is linear when is forward biased?
Below the diode's Forward Voltage (Vf) typically 0.7V, the curve is at (roughly) zero. At around 0.5 it begins to curve upward, and at around 0.7V, the voltage drop is almost constant (the curve heads straight upwards to infinity). See link.
Definition of a conducting forward biased silicon diode?
Forward biasing of diode means applying positive potential to anode and negative potential to cathode in this case these points are happen in silicon diode- 1> Depletion Width Reduces 2>Voltage across junction is fixed at 0.7 volt 3> diode behave like short circuit (low resistance up to 400 ohm.) 4> it rectify the applied A.C signal. ANSWER: It does not have fix .7 volts it has however an exponential VI curve which engineering take for practical as being .6 to.8 volts being forward conducting the voltage chosen depends on the actual current flowing a rectifier may have .8 volts while a signal diode may have .5 volts depending on the current flow. The resistance is just VI drop the impedance is 26mv/i
What value of diode if the load current is 12 amperes?
A: It can be assumed to be .7 to .8 volts if it can carry that current of 12 amps. A diode in the forward direction follows an exponential curve after it reaches . 6 volts across any farther current increase will effect this drop only slightly
Why biasing is needed at all?
Biasing is used in a transistor amplifier circuit in order to place the transistor as nearly as possible in the center of its linear region. Transistors have cutoff, linear, and saturation regions. Too little bias current, and you enter cutoff - Too much, and you saturate. Both conditions cause distortion when you attempt to use the transistor as an amplifier, as opposed to a switch.
Is zener diode a linear device?
Zener diode is not a linear device... it is non-linear one. Since linear devices are those devices which have linear characteristics(V-I CHAR.), or follows the Ohm's law i.e. voltage is directly proportional to current. but in case of Zener diode ohm's law fails down. the V-I char. in both forward biased & reverse biased condition is non-linear. So. Zener diode is non-linear device
Is diode linear?
If you consider it ON/OFF then no. It has other less-common purposes that are linear.
How do you calculate the voltage across each diode and load resistor in a bridge diode configuration?
Assuming that at one time a positive potential exists on a anode then assign a [+] to that point follow this procedure for all diodes and resistors. You can calculate Boltzmann impedance of a diode but industry wise a .6v to.8v is standard practice for a diode drop since it follow an exponential curve. .6 volts is for low current and .8volts is for more current
