By J. Chandra, A.C. Scott
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The use of an FET is desirable because its high impedance results in light loading of the crystal, provides for good stability, and does not lower the Q. This circuit is essentially a Colpitts oscillator with the crystal replacing the inductor and the inherent FET junction capacitances functioning as the split capacitor. Because these junction capacitances are generally low, this oscillator is effective only at high frequencies. The HA7210 IC can easily be used to build a crystal oscillator. It uses the Pierce oscillator circuitry just discussed with the crystal connected between pins 2 and 3.
Degradation of equipment performance takes place over a period of time due to deteriorating components (components change in value), poor align ments, and weakening power components. Introductory Topics 53 Regular performance checks are necessary for critical conununications systems. Commercial radio transmitters require performance checks to be done on a regular basis. 4 . INducEd FAiluRES Induced failures often come from equipment abuse. Unauthorized modifications may have been performed on the equipment.
L··;·+ ·l··l.. +·t··;·+·l···l"i't+++·l.. ,..... ; .. +++ ~··l "f···l .. f 3rd + ' . ' . '5th .. '. '. ' . . ' . - . '. ' . ' ... . ' . '. ' . ' : FFT ' 7tli. i. r (b) FIGURE l} (a) A low-pass filter simulating a bandwidth-li mited com mu nications channel; (b) the resulting time series and FFT waveforms after passing through the low-pass filter. Introductory Topics 34 7 LC CIRCUITS The remaining sections of this chapter cover some basic characteristics of LC circuits and oscillators.