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The electrode edge placement in a chirped surface acoustic wave (SAW) device follows the form expressed in the following formula. (Image Omitted)
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Surface Acoustic Wave Device
The electrode edge placement in a chirped surface acoustic wave (SAW)
device follows the form expressed in the following formula.
In a computer-controlled masked generator for fabricating SAW devices, the
electrodes are exposed on a photosensitized glass plate by series of light flashes
localized in the area of the desired image. If a desired electrode position is not an
even number of step sizes for the mask generator, it is rounded up or down by
the computer to an even number. The frequency-versus-time output of a linearly
chirped SAW device is ideally a straight line. However, the rounding effects
causes a deviation from the linear characteristic of the curve by several kilohertz.
To compensate for this deviation, it is proposed that the SAW device be
fabricated so that electrode fingers 12 have a slight stagger, as seen in the
figure. The device is thought of as being divided into two regions, I and II,
divided through the middle of the acoustic path, as shown in the figure. In
Region I the electrode position is rounded in one direction, and in Region II it is
rounded oppositely. The response of the two regions is considered separately
since the electrodes 10 and 11 are slightly coupled acoustically. The total device
response is then the summation of the two halves, and the net error is then
reduced by a factor of two. Such SAW devices are useful where placement
errors of the electrode device degrade frequency and...