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In Fig. 24-1, an NPN bipolar transistor is connected as a common emitter amplifier. The input signal passes through C2 to the base. Resistors R2 and R3 provide the base bias. Resistor R1 and capacitor C1 allow for the emitter to have a dc voltage relative to ground, while keeping it grounded for signals. Resistor R1 also limits the current through the transistor. The ac output signal goes through capacitor C3. Resistor R4 keeps the ac output signal from being short-circuited through the power supply. In this amplifier, the optimum capacitance values depend on the design frequency of the amplifier, and also on the impedances at the input and output. In general, as the frequency and/or circuit impedance increase, less capacitance is needed. At audio frequencies and low impedances, the capacitors might be as large as 100 F. At radio frequencies and high impedances, values will be only a fraction of a microfarad, down to picofarads at the highest frequencies and impedances. The optimum resistor values also depend on the application. In the case of a weak-signal amplifier, typical values are 470 for R1, 4.7 k for R2, 10 k for R3, and 4.7 k for R4.

The ratio dIC /dIB is different for each of the points in this graph. Geometrically, dIC /dIB at a given point is the slope of a line tangent to the curve at that point. The tangent line for point B in Fig. 22-6 is a dotted, straight line; the tangent lines for points A and C lie right along the curve. The steeper the slope of the line, the greater is dIC /dIB. Point A provides the highest dIC /dIB , as long as the input signal is small. This value is very close to HFE. For small-signal amplification, point A represents a good bias level. Engineers would say that it s a good operating point. At point B, dIC /dIB is smaller than at point A. (It might actually be less than 1.) At point C, dIC /dIB is practically zero. Transistors are rarely biased at these points.

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Figure 24-2 shows an N-channel JFET hooked up as a common source amplifier. The input signal passes through C2 to the gate. Resistor R2 provides the bias. Resistor R1 and capacitor C1 give the source a dc voltage relative to ground, while grounding it for signals. The output signal goes through C3. Resistor R3 keeps the output signal from being short-circuited through the power supply. A JFET has a high input impedance, and therefore the value of C2 should usually be small. If the device is a MOSFET, the input impedance is higher still, and C2 will be smaller yet, sometimes 1 pF or less. The resistor values depend on the application. In some instances, R1 and C1 are not used, and the source is grounded directly. If R1 is used, its optimum value will depend on the input

And they will be built around the functionality that the customer wants to use, not what the technologists want to deliver The players in the game will continue to evolve in terms of who they are and what they do As the adolescent companies in the telecom industry grow up and become young adults, they will set aside childish things and focus on serious business They will narrow down their business activities and focus on those that they do well and which make money They will recognize that they will only make money if they satisfy the demands of the customer, and they will satisfy the demands of the customer if and only if they pay attention to that customer The herd will be further culled; the numbers will drop.

Even when a transistor is biased for best operation (near point A in Fig. 22-6), a strong input signal can drive it to point B or beyond during part of the cycle. Then, dIC /dIB is

Gain versus frequency 407 reduced, as shown in Fig. 22-7. Points X and Y in the graph represent the instantaneous current extremes during the signal cycle.

impedance and the bias needed for the FET. For a weak-signal amplifier, typical values are 680 for R1, 10 k for R2, and 100 for R3.

Those that remain will be those that have the wherewithal to change their business practices on the fly to match changing customer requirements Consider the following quote from Tom Peters In Search of Excellence:.

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