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display itself will be exhibited as a separate graphical window within the program In using the Bode tool by injecting a signal into the oscillator s input and checking the phase and gain at the oscillator s output we will have a very good indication that our design is valid This is accomplished, as described above, by breaking the feedback loop of the oscillator and attaching the Bode plotter between the broken input/output points of the oscillator To obtain a proper reading, set the frequency and phase of the Bode plotter to a linear scale, adjust the magnitude to display a gain of 20 to 20 dB (or, if need be, higher values), set the display to show phase values from 180 to 180 degrees (Fig 4.

5), and adjust the frequency sweep to approximately 25 percent of the expected oscillation frequency (narrow or widen as necessary to obtain the display as shown in the figure) This open-loop Bode response test is a good indication that the oscillator will oscillate and function as intended, since the Bode plotter is outputting a 0 degree phase angle signal at the frequencies of interest into the input of the oscillator s resonator, which changes its phase by 180 degrees before it reaches the input of the transistor; the transistor, being in common-emitter configuration, changes it another 180 degrees, making for a phase change of 360, or 0, degrees, for regenerative oscillatory feedback The proper phase change, at the appropriate amplitude, can be confirmed on the Bode plotter as shown in Fig 47.

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buildings. Why would you expect ionic compounds to be good thermal insulators 3. Ionic compounds often have higher melting points than metals. Using at least two properties of ionic compounds, explain why cookware is not made from ionic compounds.

The Bode plotter is displaying the maximum gain peak at the frequency of the desired oscillation, which should occur at the same frequency as the phase trace when it crosses 0 degrees from the output to the input of the oscillator (in order to sustain oscillatory feedback) At its maximum amplitude the gain trace is called the gain margin when it is located at the same frequency as the point where the phase trace crosses the 0 degrees phase point on the Bode plotter screen, and is measured in dB The higher the gain margin, the more tolerance the oscillator will have and still start or continue to oscillate when components on the assembly line vary in specifications, or the load varies in impedance Temperature will also have far less of a deleterious effect with this higher gain margin.

A typical, safe value would be 10 dB or more; however, any gain above 0 dB at the 0 degree phase crossing will still allow the oscillator to start because of noise amplification buildup Nevertheless, temperature, load, and parts variations will make start-up erratic and/or slow when the loop is actually closed for the completed oscillator if this gain margin is too low In fact, if an oscillator has a sufficiently high gain margin, closing the loop should cause only a minor shift in the design frequency, with the high open-loop gain being reduced to unity when the oscillator reaches its steady state.

12:

In simulating the open-loop oscillator, not only should the gain peak be at the point where the phase is zero, but it should also be as close to the center of the phase slope as possible in order to maintain the oscillator s long-term stability and low noise characteristics The amount of excess phase above or below this center of the phase slope is referred to as the phase margin and is as important as the gain margin..

The #else directive works in much the same way as the else statement that forms part of the C++ language: It establishes an alternative if the #if directive fails. The previous example can be expanded to include the #else directive, as shown here:

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