Bipolar Junction Transistor Switching Characteristic

**Strings (S _{i}P_{j}A_{jk}) = S_{7}P_{5}A_{51} Base Sequence = 12735 String Sequence = 12735 - 5 - 51**

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Bipolar Junction Transistor Switching Characteristic

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Figure 122.7 illustrates a simple *BJT switch* (122.7a) and its *collector charateristic* (122.7b).

(a) Base on the *switch-triad model*, identify the *signal*, The *on state* and the *off state* of the BJT.

(b) How is the *switching characteristic* of the BJT implemented given that V_{CC} = 5 V? Assume a *transistor-transistor logic* (**TTL**) as follows:

For V_{in}, logic low (0) = 0 V; logic high (1) = 5 V

For V_{out}, logic low (0) = 0 V; logic high (1) = 5 V

**The strings**:
S_{7}P_{5}A_{51} (Physical Change).
**The math**:

Pj Problem of Interest is of type *change* (physical change). Transistors are primarily used for signal *amplification* and *switching*. Both are *change* problems.

**(a)** *Signal* is voltage. For V_{out}, *on state* (logic high) occurs when BJT is in the *cuttoff region* and *off state* (logic low) occurs when BJT is in the *saturation region*.
**(b)** *Load-line equation* at the collector circuit:

V_{CE} = V_{CC} - *i _{C}*R

The

So, from equation (1), V

When input voltage, V

So, little or no current flows

So, V

So, output voltage, V

Base current,

So, V

So, whenever, V

Whenever, V

Thus the simple BJT switch of figure 122.7(a) is implemented. This BJT is called the

The *point* **.** is a mathematical abstraction. It has negligible size and a great sense of position. Consequently, it is front and center in abstract existential reasoning.

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