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Crystal-Controlled Oscillators Quartz crystals can be used in place of tuned LC circuits in RF oscillators, as long as it isn t necessary to change the frequency often Crystal oscillators offer frequency stability far superior to that of LC tuned VFOs There are several ways that crystals can be connected in bipolar or FET circuits to get oscillation One common circuit is the Pierce oscillator An N-channel JFET and quartz crystal are connected in a Pierce configuration as shown in the schematic diagram of Fig 24-16 The crystal frequency can be varied somewhat (by about 01 percent, or 1 part in 1000) by means of an inductor or capacitor in parallel with the crystal But the frequency is determined mainly by the thickness of the quartz wafer, and by the angle at which it is cut from the original quartz sample Crystals change in frequency as the temperature changes.

where f is in Hertz and L is in henrys. Alternatively, f can be expressed in megahertz, and L can be given in microhenrys. The complex value is jB j(1/(6.28fL). Moving downwards along the jB axis indicates decreasing values of inductance.

Ones Tens Hundreds Thousands Ten thousands Hundred thousands Millions And so on In base 2, the columns are

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Quiz 431 A. It is easily damaged by static electricity. B. It needs a high input voltage. C. It draws a large amount of current. D. It produces a great deal of electrical noise. 13. The input impedance of a MOSFET: A. Is lower than that of a JFET. B. Is lower than that of a bipolar transistor. C. Is between that of a bipolar transistor and a JFET. D. Is extremely high. 14. An advantage of MOSFETs over JFETs is that: A. MOSFETs can handle a wider range of gate voltages. B. MOSFETs deliver greater output power. C. MOSFETs are more rugged. D. MOSFETs last longer. 15. The channel in a zero-biased JFET is normally: A. Pinched off. B. Somewhat open. C. All the way open. D. Of P-type semiconductor material. 16. When an enhancement-mode MOSFET is at zero bias: A. The drain current is high with no signal. B. The drain current fluctuates with no signal. C. The drain current is low with no signal. D. The drain current is zero with no signal. 17. An enhancement-mode MOSFET can be recognized in schematic diagrams by: A. An arrow pointing inward. B. A broken vertical line inside the circle. C. An arrow pointing outward. D. A solid vertical line inside the circle. 18. In a source follower, which of the electrodes of the FET receives the input signal A. None of them. B. The source. C. The gate. D. The drain.

But they are far more stable than LC circuits, most of the time Some crystal oscillators are housed in temperature-controlled chambers called crystal ovens In this environment, crystals maintain their frequency so well that they are sometimes used as frequency standards against which other oscillators are calibrated The Phase-Locked Loop One type of oscillator that combines the flexibility of a VFO with the stability of a crystal oscillator is known as a phase-locked loop (PLL) This makes use of a circuit called a frequency synthesizer The heart of the PLL is a VCO The output of this oscillator passes through a programmable multiplier/divider, a digital circuit that divides and/or multiplies the VCO frequency by integral (whole-number) values chosen by the operator As a result, the output frequency can be any rationalnumber multiple of the crystal frequency.

432 The field-effect transistor 19. Which of the following circuits has its output 180 degrees out of phase with its input A. Common source. B. Common gate. C. Common drain. D. All of them. 20. Which of the following circuits generally has the greatest gain A. Common source. B. Common gate. C. Common drain. D. It depends only on bias, not on which electrode is grounded.

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A well-designed PLL circuit can be tuned in small digital increments over a wide range of frequencies The output frequency of the multiplier/divider is locked, by means of a phase comparator, to the signal from a crystal-controlled reference oscillator As long as the output from the multiplier/divider is exactly on the reference oscillator frequency, the two signals are in phase, and the output of the phase comparator is 0 V dc If the VCO frequency begins to drift, the output frequency of the multiplier/divider will drift, too (although at a different rate) But even a frequency change of less than 1 Hz causes the phase comparator to produce a dc error voltage This error voltage is either pos-.

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