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In electronic circuits, N-channel and P-channel devices can do the same kinds of things. The main difference is the polarity. An N-channel device can almost always be replaced with a P-channel JFET, and the power-supply polarity reversed, and the circuit will still work if the new device has the right specifications. Just as there are different kinds of bipolar transistors, there are various types of JFETs, each suited to a particular application. Some JFETs work well as weak-signal amplifiers and oscillators; others are made for power amplification. Field-effect transistors have some advantages over bipolar devices. Perhaps the most important is that FETs are available that generate less internal noise than bipolar transistors. This makes them excellent for use in sensitive radio receivers at very high or ultra-high frequencies. Field-effect transistors have high input impedances. The gate controls the flow of charge carriers by means of an electric field, rather than via an electric current.

The circuits you ve seen so far have been general, not application-specific. With capacitors of several microfarads, and when biased for class A, these circuits are representative of audio amplifiers.

Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.

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Either the N-channel or the P-channel JFET works because the voltage at the gate causes an electric field that interferes, more or less, with the flow of charge carriers along the channel. A simplified drawing of the situation for an N-channel device is shown in Fig. 23-3. For a P-channel device, just interchange polarity (minus/plus) and semiconductor types (N/P) in this discussion. As the drain voltage ED increases, so does the drain current ID, up to a certain level-off value. This is true as long as the gate voltage EG is constant, and is not too large negatively. But as EG becomes increasingly negative (Fig. 23-3A), a depletion region (solid black) begins to form in the channel. Charge carriers cannot flow in this region; they must pass through a narrowed channel. The more negative EG becomes, the wider the depletion region gets, as shown at B. Ultimately, if the gate becomes negative enough,

Frequency Response High-fidelity audio amplifiers, of the kind used in music systems, must have more or less constant gain from 20 Hz to 20 kHz This is a frequency range of 1000:1 Audio amplifiers for voice communications must work from 300 Hz to 3 kHz, a 10:1 span of frequencies In digital communications, audio amplifiers are designed to work over a narrow range of frequencies, sometimes less than 100 Hz wide Hi-fi amplifiers are usually equipped with resistor-capacitor (RC) networks that tailor the frequency response These are tone controls, also called bass and treble controls The simplest hi-fi amplifiers use a single knob to control the tone More sophisticated amplifiers have separate controls, one for bass and the other for treble The most advanced hi-fi systems make use of graphic equalizers, having controls that affect the amplifier gain over several different frequency spans.

23-3 At A, depletion region (solid area) is not wide, and many charge carriers (arrows) flow. At B, depletion region is wider, channel is narrower, and fewer carriers flow. At C, channel is completely obstructed, and no carriers flow.

Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.

Volume Control Audio amplifier systems usually consist of two or more stages A stage is one bipolar transistor or FET (or a push-pull combination), plus peripheral resistors and capacitors Stages can be cascaded one after the other to get high gain In one of the stages in an audio system, a volume control is used This control can be as simple as a potentiometer that allows the gain of a stage to be adjusted without affecting its linearity An example of a basic volume control is shown in Fig 24-7 In this amplifier, the gain through the transistor is constant The ac output signal passes through C1 and appears across R1, a potentiometer The wiper (indicated by the arrow) of the potentiometer picks off more or less of the ac output signal, depending on the position of the control shaft.

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