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Volume 39, Number 3, July - September, 2005
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A Practical Guide to High-Speed Printed-Circuit-Board Layout Despite its critical nature in high-speed circuitry, PCB layout is often one of the last steps in the design process, with sloppy layouts sometimes causing circuit designs that look good “on paper” to render mediocre performance. This article addresses high-speed layout from a practical perspective, discussing topics that can improve circuit performance, reduce design time, and minimize time-consuming revisions. |
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DDS Controls Waveforms in Test, Measurement, & Communications Direct Digital Synthesizers can generate frequencies from a few hertz to greater than 400 MHz with less than 1 degree phase resolution. They can quickly hop from one frequency to another—in a phase-continuous manner—without settling anomalies. DDS-based waveform generation is used to locate resonant frequencies in industrial applications and as agile frequency sources in RF communication systems. |
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The novel application of a phase-locked loop allows one channel of the AD71028 BTSC- (Broadcast Television Standards Committee) encoder to derive the primary channel’s master clock, while the other channel provides the Multichannel Television Sound (MTS) stereo-encoded output for satellite set-top boxes and receivers. |
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