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The JFET works by varying the width of the channel. Normally the channel is wide open; as the depletion region gets wider and wider, choking off the channel, the charge carriers are forced to pass through a narrower and narrower path. This is known as the depletion mode of operation for a field-effect transistor. A MOSFET can also be made to work in the depletion mode. The drawings and schematic symbols of Figs. 23-7 and 23-8 show depletion-mode MOSFETs. However, MOS technology also allows an entirely different means of operation. An enhancement-mode MOSFET normally has a pinched-off channel. It is necessary to apply a bias voltage, EG, to the gate so that a channel will form. If EG = 0 in such a MOSFET, that is, if the device is at zero bias, the drain current ID is zero when there is no signal input. The schematic symbols for N-channel and P-channel enhancement-mode devices are shown in Fig. 23-10. The vertical line is broken. This is how you can recognize an enhancement-mode device in circuit diagrams.

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The output of a common emitter or common source amplifier is out of phase from the input. If you couple the collector to the base through a capacitor, you won t get oscillation. It is necessary to reverse the phase in the feedback process in order for oscillation to occur. In addition, the amplifier gain must be high, and the coupling from the output to the input must be good. The positive feedback path must be easy for a signal to follow. Most oscillators are common emitter or common source amplifier circuits with positive feedback. The output of a common base or common gate amplifier is in phase with the input. But these circuits have limited gain, and it s hard to make them oscillate. Common collector and common drain circuits don t have enough gain to make oscillators.

There are three different circuit hookups for FETs, just as there are for bipolar transistors. These three arrangements have the source, the gate, or the drain at signal ground. The common-source circuit places the source at signal ground. The input is at the base. The general configuration is shown in Fig. 23-11. An N-channel JFET is used here,

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Feedback at a Single Frequency The frequency of an oscillator is controlled by means of tuned, or resonant, circuits. These are usually inductance-capacitance (LC ) or resistance-capacitance (RC ) combinations. The LC scheme is common in radio transmitters and receivers; the RC method is more often used in audio work. The tuned circuit makes the feedback path easy for a signal to follow at one frequency, but hard to follow at all other frequencies. As a result, oscillation takes place at a predictable and stable frequency, determined by the inductance and capacitance, or by the resistance and capacitance.

426 The field-effect transistor but the device could be an N-channel, depletion-mode MOSFET and the circuit diagram would be the same. For an N-channel, enhancement-mode device, an extra resistor would be necessary, running from the gate to the positive power supply terminal. For P-channel devices, the supply would provide a negative, rather than a positive, voltage.

along at a stately 15 inches per second (IPS) To meet the bandwidth requirements of the video signal, the tape had to be accelerated to somewhere between 300 and 400 inches per second, roughly 25 miles per hour To put this into perspective, a tape that would accommodate an hour s worth of audio in those days would hold one minute of video, which did not take into account the length of the leader that had to be in place to enable the recorder to reach its ridiculously high tape transport speed To hold 15 minutes of video, a reel of quarter-inch tape would have had to be three feet in diameter, not exactly portable Put another way, a one-hour show would require 25 miles of tape! To get around this problem, Camras invented the spinning record head.

Many circuit arrangements can be used to produce oscillation. The following several circuits are all known as variable-frequency oscillators (VFOs), because their frequencies are adjustable over a wide range.

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