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SAW-based oscillators are becoming more popular in the VHF and above regions, and are similar in design and concept to crystal oscillators However, surface acoustic wave (SAW) devices are limited in design usefulness; unless the center frequency is a common one, no SAW resonators are available without an expensive custom production run And the initial frequency stability, temperature stability, Q, and aging characteristics are many times worse than those of an average crystal resonator Nonetheless, replacing crystals with SAW resonators makes it possible to operate at very high frequencies of up to 2 GHz, and with powers of up to 22 dBm at 500 MHz Depending on the application, a crystal oscillator may require higher frequency accuracy over temperature than a normal noncompensated crystal oscillator (XO) can supply This will demand that some type of compensated device be used, such as a temperature-controlled crystal oscillator (TCXO) or an ovencontrolled crystal oscillator (OCXO) However, increased size, cost, current consumption, and complexity are the tradeoffs if such a compensated oscillator is to be adopted And, depending on the angle of the cut for AT crystals, frequency stability over a desired temperature range can be optimized for an uncompensated crystal oscillator, sometimes making compensated oscillators unnecessary: Frequency stabilities of 5 ppm from 25 to 70 C are possible with the appropriate AT cut angle in an XO Wider temperature variations than this will quickly degrade an AT cut s frequency stability dramatically (down to 20 ppm from 40 to 80 C), necessitating the use of a TCXO, or even an OCXO Most of the components making up any oscillator are temperature sensitive, especially important being the crystal and the ceramic capacitors of its resonator network Even the finest crystal oscillator, if built with poor or inappropriate ceramic capacitors, may have unacceptable frequency drift In a well-designed oscillator, the majority of the long and short-term frequency drift should originate only from within the crystal and any circuit that adds more than double the drift of a lone crystal is improperly designed The use of incorrect temperature-compensating ceramic capacitors, or capacitors with poor temperature tolerance versus capacitance, can destroy frequency stability of an otherwise good oscillator However, if high frequency stability of better than a few ppm is required, then both the crystal and the entire oscillator circuit itself must be ovenized within an OCXO The OCXO ovenizes not only the crystal, but all of the temperature-sensitive components It has the highest stability commonly available in compensated crystal oscillators, with better than 0001 ppm being common with SC-cut or AT-cut crystals over a wide temperature range The oscillator itself is kept in a temperature-controlled oven that maintains the crystal and circuits at a temperature that is 10 C above the highest specified ambient temperature The OCXO can even be tuned very slightly (by a few ppm) by a small screw located within the case However, OCXOs are high in cost, consume much more current than a standard oscillator, have a certain warm-up period to reach full frequency accuracy, and may have poor aging characteristics because of the high heat that the crystal is constantly subjected to.

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

The objectives of this chapter are as follows: Introduce the TCP/IP and OSI communication models Define the protocols of the TCP/IP protocol suite Explore the addressing schemes used by the different layers of the TCP/IP protocol suite Examine how the protocols and reference tables maintained by the protocols cooperate to transport a packet through an internetwork Serve as a technology primer ( 3 deals with the practical aspects of implementing the protocols discussed here on Cisco router equipment)

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The TCXO is a highly temperature stable crystal oscillator, with better than 1 ppm stability TCXO s make use of a temperature sensor, normally a thermistor, which generates a correction voltage to the TCXO s compensation network, a varactor diode, which then overpowers the frequency drifting effects of the changing temperature within the oscillator s circuits TCXOs are lower in cost, with significantly less current requirements than an OCXO, and warm up nearly instantaneously

Choosing a color of paint in Elements is almost as easy as dipping a brush in a bucket; it is a little different, though Say you want to paint something red To use red paint in Elements, you must first specify red as the foreground color That s because tools like the Paintbrush, Paint Bucket, and Pencil always use the foreground color The default foreground color is always black, so if you want to paint or draw with any other color, you have to pick a new foreground color Take a look at the bottom section of the Toolbox (see Figure 6-2) Those two overlapping swatches of color show what colors are specified as the foreground (top) and background (bottom) color You should see black and white now because these are the default colors To change either one, click the appropriate swatch in the Toolbox to open the Color Picker

To test and optimize the completed physical oscillator for start-up and proper functioning (frequency, amplitude, spurs, etc) under most real-world conditions as expected in normal operation, duplicate the following tests and optimization procedures 1 Connect the closed-loop oscillator to a spectrum oscillator 2 Confirm that the oscillator reliably starts at room temperature by turning it on and off a number of times Cool the circuit with a canned cooler and repeat Heat the circuit with a heat gun set on low and repeat 3 Test for the expected output: a Check that the oscillator frequency is stable at room temperature, and that it is stable during and after the above heat/cool test b Check for close-in spurious responses c Check the approximate phase noise level (see Phase noise tests on p 94) d Check that the amplitude is as expected, and that it is stable over time e Check for any wide-ranging spurious responses and excessive harmonic levels It will normally be necessary to improve the amplitude, stability, starting, and spectral purity of the oscillator by tweaking for optimum performance: Change the L/C or R/C ratio; vary the transistor s bias current; tweak any tuning capacitor in series with the crystal Perform until an optimum point is reached that satisfies your required specifications Always send the oscillator through the full complement of starting, frequency, amplitude, and spurious response tests after any tuning procedure is completed

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