What is the voltage drop between collector and emitter?
Power dissipation: The power dissipated in the transistor is the voltage drop across the collector emitter junction times the collector current (neglecting the base current times the 0.75V base emitter drop). In the linear range this could be something like 6V@100mA = 600mW (a lot for a little transistor).
What is emitter follower find voltage gain and current gain?
Voltage Gain of Emitter Follower In order to find the voltage gain of the amplifier, the above figure can be replaced by the following figure. So, AV ≈ 1. In practice, the voltage gain of an emitter follower is between 0.8 and 0.999.
How do you find emitter voltage?
Determine the voltage drop between the collector and emitter junctions (Vce) of the transistor using the formula Vce = Vcc – IcRc, where “Vce” is the collector emitter voltage; “Vcc” is the supply voltage; and “IcRc” is the voltage drop across the base resistor (Rb).
What is the emitter voltage?
The collector-emitter saturation voltage is the voltage drop that occurs when the transistor is carrying current. It is specified at a given collector current and a given base current or as a gain that is the ratio of collector current to base current. The saturation voltage is also a function of junction temperature.
The collector voltage, ( Vc ) must be greater and positive with respect to the emitter voltage, ( Ve ) to allow current to flow through the transistor between the collector-emitter junctions. Also, there is a voltage drop between the Base and the Emitter terminal of about 0.7V…
What is the relationship between base and emitter in NPN?
The voltage between the Base and Emitter ( VBE ), is positive at the Base and negative at the Emitter because for an NPN transistor, the Base terminal is always positive with respect to the Emitter. Also the Collector supply voltage is positive with respect to the Emitter ( VCE ).
Why is the base voltage of an NPN transistor always positive?
The voltage between the Base and Emitter ( V BE ), is positive at the Base and negative at the Emitter because for an NPN transistor, the Base terminal is always positive with respect to the Emitter. Also the Collector supply voltage is positive with respect to the Emitter ( V CE ).
Is there a negative voltage for VCE-BJT NPN?
BTW: the title of the question “Negative voltage for Vce – BJT NPN” doesn’t fit to the schematic: Vce would only be negative if V1 > V2. Redrawn with proper conventions for orientation in a logic diagram.
What should the collector voltage be for a transistor?
Here is the typical behavior in saturation: As you can see Vce (sat) of 300mV covers the useful range of the transistor. You could equally well pick 100mV for collector currents of less than 100mA, it’s just a reasonable choice based on how real transistors behave. Neither may be realistic for power transistors.
What should the saturation voltage of a transistor be?
You would like the transistor to be well into saturation. For a relatively low current single silicon transistor something like 300mV is a reasonable measure of it being well into saturation. For example, consider the 2N4401, a common NPN TO-92 transistor.