Recent Newsletter

PLL Response Time

A PLL is a tracking device. When its input changes, the PLL responds, but not instantly. The time it takes for a PLL to respond to a step change in its input is called the response time. From the response time you can derive the PLL tracking bandwidth.

read more


Our archives contain hundreds of detailed, comprehensive answers to complex questions, plus archives of editorial articles written for EDN magazine and other publications.

HSDD Newsletter

The High-Speed Digital Design Newsletter originally evolved as a Q & A forum for students of Dr. Johnson's seminars. Now open to everybody, read more...

High-Speed Digital Design

A Handbook of Black Magic

High-Speed Signal Propagation book coverConsidered the "bible" of high-speed design issues, this book helps engineers who work with digital systems shorten their product development cycles and fix their latest high-speed design problems. read more...

High-Speed Signal Propagation

Advanced Black Magic

High-Speed Signal Propagation book coverAn advanced-level reference text for experienced digital designers who want to press their designs to the upper limits of speed and distance. read more...