Analog Diablog is the place to comment on the articles found in Analog Dialogue (or those that you'd like to see). It can also be used as a discussion forum on products, applications, technology, and techniques for analog, digital, and mixed-signal processing using Analog Devices components.
Medical ultrasound systems, among the more complex signal processing devices in use today, are used for real-time detection of health problems and general diagnostic procedures. Slower than radar and faster than sonar, ultrasound systems have become increasingly portable, evolving from cart-based systems into palm-sized devices. This article discusses some of the necessary ingredients of compactness.
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A high-speed current-output DAC and a single op amp can generate a power amplifier (PA) ramp profile that fits the RF gain requirements for TDMA. The ramp is applied to the voltage control pin of a variable-gain amplifier (VGA) to control the gain of the RF signal entering the PA. Open a Dialogue Question the authors. Share information with your colleagues. Leave feedback for the editors. What did you think of this article? Was it useful, timely, well written? Would you like to see more articles on this topic?
Electrical ground looks simple on a schematic, but circuit performance is dictated by the PCB layout. Ground-node analysis is difficult, especially for dc-to-dc converters, such as buck and boost circuits, which pound the ground node with large, fast-changing currents. When ground moves, performance suffers and the system radiates EMI. An understanding of ground noise can provide a sense for reducing the problem. Open a Dialogue Question the authors. Share information with your colleagues. Leave feedback for the editors. What did you think of this article? Was it useful, timely, well written? Would you like to see more articles on this topic?
