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The knee refers to the shape of the curve when plotting voltage vs current in forward biased semiconductor junctions.
Knee voltage, or threshold voltage, varies with device construction, doping level, and operating temperature among other parameters. This is due to the bandgap at the PN junctions of the diode. Therefore, even when forward biased, little current will flow until the diodes threshold voltage is exceeded.
Threshold voltages for common silicon diodes is approximately 0.7V, and for Schottky devices near 0.3V. Germanium based diodes exhibit lower voltage thresholds than silicon based diodes, but are less common due to other limitations.
All diodes also exhibit a reverse bias breakdown. Engineers normally avoid operation small signal and rectifier diodes in this mode by selecting a device with a reverse voltage specification much higher than expected voltages. However; zener diodes are specially constructed and doped to produce a relatively low reverse breakdown voltage which is commonly used in shunt regulators and overvoltage protection circuits. Various values of zener voltage are available.
What else can I help you with?
What is power transistor base emitter voltage?
Its is the emiiter base of the transistor voltage!
What is knee voltage for GAAs?
Knee voltage, also known as threshold voltage, in Gallium Arsenide (GaAs) refers to the minimum voltage required to initiate significant current flow in a GaAs device, such as a transistor or diode. This voltage is crucial for determining the operational characteristics of GaAs-based electronic components. Typically, knee voltage in GaAs devices is lower compared to silicon counterparts, making GaAs favorable for high-frequency and high-efficiency applications.
What is Collector Emitter saturation voltage?
Collector-emitter saturation voltage refers to the voltage drop across the collector-emitter junction of a transistor when the transistor is in saturation mode. It is the minimum voltage required to keep the transistor in saturation, where the transistor is fully turned on and conducting maximum current.
What is knee voltage for silicon and germanium?
The knee voltage for silicon is approximately 0.7V, while for germanium it is around 0.3V. The knee voltage is the voltage at which a diode starts conducting significantly.
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Transistor Series Voltage Regulator
What is knee voltage and breakdown voltage?
Knee voltage (cut in voltage) :-The forward voltage at which the current through the P-N Junction starts increasing rapidly is called as Cut in voltage or knee voltage Breakdown voltage :-It is the minimum reverse voltage at which the P-N Junction can conduct without damage to the current
What is emitter biasing?
Emitter biasing is when you add a resistor between the emitter of a transistor and the 0v rail so that any voltage developed across the emitter will subtract from the voltage on the base and effectively turn the transistor OFF. We are talking about an NPN transistor and the transistor is an "ordinary transistor" or BJT (bi-polar Junction Transistor). For more information on transistor biasing see: Talking Electronics website.
What is offset voltage of Field Effect Transistor?
0.7V
What is meant by cut in voltage in diode?
Cut in voltage (Knee voltage): The forward voltage at which the current through the P-N Junction starts increasing rapidly is called as Cut in voltage or knee voltage.
Gm of a transistor is proportional to?
Gm of a transistor is proportional to Ie/Vt. That is, emitter current divided by thermal voltage.
Which bjt transistor amplifier can be used as a voltage buffer?
the common collector can use as voltage buffer
What is a barrier voltage?
The voltage across a forward-biased PN junction in a semiconductor diode or transistor.
