Which is the forward active region of the BJT?
The final region of operation of the BJT is the “forward active” region. It is in this region that the transistor can act as a fairly linear amplifier. In this region, we see that: * 0.2 < Vce < Vcc ; where Vcc is the supply voltage * Ib > 0 and Ic > 0 * Vbe >= 0.7V Thus the transistor is on and the collector to emitter voltage is somewhere
Which is the correct equation for a BJT?
Equation 1 gives the total current flowing in the emitter of a BJT. Since the base current I B is very small compared to the collector current I C, it is usually neglected and equation 2 suffices for most applications. I E = I C + I B (eq. 1) I E ≈ I C (eq. 2)
Where is the saturation region on a BJT?
The cutoff region lies along the horizontal axis. The saturation region is the area to the left of the near-vertical line. The straight, horizontal lines represent the active region. Put another way, these curves describe the effects the base current and emitter-to-collector voltage have on the emitter / collector currents.
What are the three terminals of a BJT?
Recall that there are two main types of BJTs and that the BJT is a three terminal device, as we can see in figure 1. The three terminals are the base, collector, and emitter. Figure 1: the two main types of bipolar junction transistors are NPN and PNP.
When does the BJT go into saturated mode?
Once the BC junction transitions into forward-biased, the BJT is in saturated mode. However, saturation is gradual in the sense that β gradually declines and doesn’t suddenly change (it’s not a switch-like effect) — in the above examples where the base current is gradually changed.
What is the collector voltage in saturation region?
This works fine, as the collector voltage will then be V C = 10 V − I C ⋅ R 1 = 1 V. This voltage is between the ground rail of 0 V and the power supply rail of 10 V and since the transistor isn’t yet in saturation, as I still expect V C ≥ V B (given V E = 0 V .)
How to analyze BJT circuit with d.c.sources?
To analyze BJT circuit with D.C. sources, we mustfollow these five steps: 1. ASSUME an operating mode 2. ENFORCE the equality conditions of that mode. 3. ANALYZE the circuit with the enforced conditions. 4. CHECK the inequality conditions of the mode for consistency with original assumption.