11/29/2023 0 Comments Vbe saturation voltage![]() At this point, the base current is maximum and so is the collector current. So, you know V=V applied to base - 0.7v, I=0.003A. The point where the load line intersects the IB IB(sat) curve is called saturation. For safe base turnon reasons you select 3mA, checking the datasheet that this current is within limits. Collector-Emitter Saturation Voltage VCE(sat)1 IC10mA, IB1mA - 0.2 V VCE(sat)2 IC50mA, IB5mA - 0.3 Base-Emitter Saturation Voltage VBE(sat)1 IC10mA, IB1mA 0.65 - 0.85 V VBE(sat)2 IC50mA, IB5mA - 0.95 Transition Frequency fT VCE20V, IC10mA, f100MHz 300 - MHz Collector. A current of 200mA flows through collector, and the transistor has hfe 300. So, you know Rc and current flowing through collector. In the sense that, as you know, each transistor has hfe (gain). 0.6V for silicon NPN transistor, but you have lets say 10M resistor in base branch, Ic will be close to zero, since you multiplying beta with zero. Below is an NPN transistor symbol and the voltages at its terminals are Vb, Vc and Ve with respect to the ground: I read that: during the saturation the Vce (Vc-Ve) settles to around 0.2V and the further increase in base current will not make Vce zero. There you have to decide the amount of current you want flowing through the collector. A question about Vce of an NPN BJT in saturation region. The nonzero slope indicates the output resistance is nite. Indicate the forward bias region and saturation region on the IC. IB is from 0.1uA to 1uA, in step of 0.1uA. This is known as forced IB output characteristics. Simulate IC as a function of VCE for various IB values. i C I S exp(v BE V t)(1 + v CE V A) where V A is the Early voltage whose value is in the range of 10 V to 100 V. This type of plot is known as forced VBE output plot. This is accounted for by the following relation. Rc is only needed for common base or common emitter. Early Voltage As Practical BJTs have nite slope in the i C Vs v CE characteristics while acting in active mode. To understand this better, read on this:Ĭommon collector - Wikipedia, the free encyclopediaĬommon base - Wikipedia, the free encyclopediaĬommon emitter - Wikipedia, the free encyclopedia ![]() NPN is mostly used as it is easier and safer to switch with Vb=+ve rather than Vb=0 or -ve, however if the application asks for it, you'll need to use PNP.Ĭommon base/emitter/collector will depend on the application and your choice as well. Okay, first between NPN and PNP, it depends on your use.
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