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Basic FET amplifier circuit
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In Fig. 24-3, an N-channel JFET is 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 ac signals. The ac output signal goes through capacitor C3. Resistor R3 keeps the ac output signal from being short-circuited through the power supply.
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24-3 An amplifier using an FET. Component designators and values are discussed in the text.
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Concerning the values of the capacitors, the same considerations apply for this amplifier, as apply in the bipolar circuit. A JFET amplifier almost always has a high input impedance, and therefore the value of C2 will usually be small. If the device is a MOSFET, the input impedance is even higher, and C2 will be smaller yet, sometimes as little as 1 pF or less.
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The class-A amplifier 439 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 value will depend on the input impedance and the bias needed for the FET. Nominal values might be R1 680 , R2 = 10 K , and R3 100 for a weak-signal, wideband amplifier. If the circuit is used as a power amplifier, the values of the resistors will be different. It might be necessary to bias the gate negatively with respect to the source, using a second power supply with a voltage negative relative to ground.
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The class-A amplifier
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With the previously mentioned component values, the amplifier circuits in Figs. 24-2 and 24-3 will operate in class A. Weak-signal amplifiers, such as the kind used in the first stage of a sensitive radio receiver, are always class-A. The term does not arise from inherent superiority of the design or technique (it s not like saying grade-A eggs ). It s just a name chosen by engineers so that they know the operating conditions in the bipolar transistor or FET. A class-A amplifier is always linear. That means that the output waveform has the same shape as (although a much greater amplitude than) the input waveform. For class-A operation with a bipolar transistor, the bias must be such that, with no signal input, the device is near the middle of the straight-line portion of the IC vs EB (collector current versus base voltage) curve. This is shown for an NPN transistor in Fig. 24-4. For PNP, reverse the polarity signs. With a JFET or MOSFET, the bias must be such that, with no signal input, the device is near the middle of the straight-line part of the ID vs EG (drain current versus gate
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24-4 Various classes of amplifier operation for an NPN bipolar transistor.
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440 Amplifiers voltage) curve. This is shown in Fig. 24-5 for an N-channel device. For P-channel, reverse the polarity signs.
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It is important with class-A amplifiers that the input signal not be too strong. Otherwise, during part of the cycle, the base or gate voltage will be driven outside of the straight-line part of the curve. When this occurs, the output waveshape will not be a faithful reproduction of the input waveshape; the amplifier will be nonlinear. This will cause distortion of the signal. In an audio amplifier, the output might sound raspy or scratchy. In a radio-frequency amplifier, the output signal will contain a large amount of energy at harmonic frequencies, The problem of harmonics, however, can be dealt with by means of resonant circuits in the output. These circuits attenuate harmonic energy, and allow amplifiers to be biased near, at, or even past cutoff or pinchoff.
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The class-AB amplifier
When a class-A amplifier is working properly, it has low distortion. But class-A operation is inefficient. (Amplifier efficiency will be discussed later in this chapter.) This is mainly because the bipolar transistor or FET draws a large current, whether there is a signal input or not. Even with zero signal, the device is working hard. For weak-signal work, efficiency is not very important; it s gain and sensitivity that matter. In power amplifiers, efficiency is a significant consideration, and gain and sensitivity are not so important. Any power not used toward generating a strong output signal will end up as heat in the bipolar transistor or FET. If an amplifier is designed to produce high power output, inefficiency translates to a lot of heat.
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