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This circuit is an almost exact replica of the grounded-emitter bipolar arrangement. The only difference is the lack of a voltage-dividing network for bias on the control electrode. Capacitor C1 and resistor R1 place the source at signal ground while elevating this electrode above ground for dc. The ac signal enters through C2; resistor R2 adjusts the input impedance and provides bias for the gate. The ac signal passes out of the circuit through C3. Resistor R3 keeps the output signal from being shorted out through the power supply. The circuit of Fig. 23-11 is the basis for amplifiers and oscillators, especially at radio frequencies. The common-source arrangement provides the greatest gain of the three FET circuit configurations. The output is 180 degrees out of phase with the input.

The common-gate circuit (Fig. 23-12) has the gate at signal ground. The input is applied to the source. The illustration shows an N-channel JFET. For other types of FETs, the same considerations apply as described above for the common-source circuit. Enhancement-mode devices would require a resistor between the gate and the positive supply terminal (or the negative terminal if the MOSFET is P-channel).

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The Armstrong Circuit A common emitter or common source class A amplifier can be made to oscillate by coupling the output back to the input through a transformer that reverses the phase of the fed-back signal. The schematic diagram of Fig. 24-12 shows a common-source amplifier whose drain circuit is coupled to the gate circuit by means of a transformer. The frequency is controlled by a capacitor in series with the secondary winding. The inductance of the secondary, along with the capacitance, forms a resonant circuit that passes energy easily at one frequency while attenuating the energy at other frequencies. This circuit is known as an Armstrong oscillator. A bipolar transistor can be used in place of the JFET, as long as the device is biased for class A amplification. The Hartley Circuit Another method of obtaining controlled feedback at RF is shown in Fig. 24-13. In this circuit, a PNP bipolar transistor is used. The circuit uses a single coil with a tap on the windings to provide the feedback. A variable capacitor in parallel with the coil determines the oscillating frequency, and allows for frequency adjustment. This circuit is called a Hartley oscillator. In the Hartley circuit, as well as in most other RF oscillator circuits, it is important to use only the minimum amount of feedback necessary to get oscillation. The amount of feedback is controlled by the position of the coil tap. The circuit shown in Fig. 24-13 uses about 25 percent of its amplifier power to produce feedback. The other 75 percent of the power can be used as output. Oscillators usually produce less than 1 W of RF power output. If more power is needed, the signal can be boosted by one or more stages of amplification.

Instead of moving the tape rapidly past the recording head, he moved the tape slowly and rapidly spun the head By attaching the head to a 20,000-rpm Hoover vacuum cleaner motor (stolen, by the way, from his wife s vacuum cleaner), he was able to use two-inch tape and reduce the tape transport speed to 30 to 40 inches per second, a dramatic improvement The first video demonstrations were admirable, but rather funny First of all, the resolution of the television was only 40 lines per inch compared to more than 250 on modern systems The images were so poor that audiences required a narrator to tell them what they were seeing on the screen Luckily, other advances followed The original video systems rendered black-and-white images, but soon a color system was developed.

The dc bias for the common-gate circuit is basically the same as that for the common-source arrangement. But the signal follows a different path. The ac input signal enters through C1. Resistor R1 keeps the input from being shorted to ground. Gate bias is provided by R1 and R2; capacitor C2 places the gate at signal ground. In some common-gate circuits, the gate electrode is directly grounded, and components R2 and C2 are not used. The output leaves the circuit through C3. Resistor R3 keeps the output signal from being shorted through the power supply. The common-gate arrangement produces less gain than its common-source counterpart. But this is not all bad; a common-gate amplifier is very stable, and is not likely to break into unwanted oscillation. The output is in phase with the input.

jBC = j(6.28f C ) = j(6.28 1.592 0.001000) = j0.0100 Finally, consider the conductance, which is 1/10.0 = 0.100 S, and the inductive susceptance as existing together in a single component. That means that one of the parallel-connected admittances is 0.100 j0.0100. The other is 0.0000 + j0.0100. Adding these gives 0.100 + j0.

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