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the decibel (db) is one of the most widely used measurement units in electrical engineering, but is a common source of misunderstanding for unfamiliar engineers. fundamentally, the db is a ratio, but the concept the decibel is also used to describe absolute quantities, of which power is the most common example. this article will cover: definition of the decibel when to use 10log10 or 20log10 why engineers use the decibel common decibel units used in electrical engineering db dbm dbw dbc dba dbi definition of the decibel the decibel is a unit of printed circuit boards have many different types of layers.  to the uninitiated these layer types can be quite confusing, but once you have a basic understanding, you’ll see that it is all quite simple. common pcb layer types mechanical layer keep out layer routing layers three dimensional view of a 4-layer pcb that has two routing layers (top and bottom) and two internal planes (gnd and pwr).  don’t if you want to be an fpga programmer, which of the two dominant fpga programming languages do you learn?  this question is asked so often by engineers new to the field of digital design, you’d think there would be a definitive answer.  in this article i’m going to cover the main differences, pros, and cons about each language, but first i’m going to tell you that you’re asking the wrong question.   the right question the wrong question is, “which language should i learn?”.  the better question is, “which language should i learn this is the third post in our altium designer pcb design video tutorial series.  the first video showed you the basics of creating a pcb project in altium.  the second demonstrated how.. read more. creating a new design in xilinx system generator and the xilinx blockset. the xilinx system generator design flow is a fantastic tool for implementing digtial signal processing (dsp) designs in xilinx fpgas. this video series will introduce xilinx system.. read more this is the second post in our altium designer pcb design video tutorial series.  in the first video, we created the files necessary