Analog and mixed signal IC design: DMOS transistors

We are all familiar with the MOSFET. Some of us are also very familiar with JFETs.
However, there are a number of transistor types that are not so common. One of these is the DMOS transistor or double diffused MOS transistor. In recent years the DMOS transistor has been used more and more to provide high voltage capability to analog and mixed signal IC designers. It is very popular in the design of MEMs interfaces where higher voltages are required. Currents are usually not high. DMOS transistors can deliver higher currents but need a larger size. The tradeoff is obvious. The DMOS structure is an interesting one. For further detailed information please go to our website, www.signalpro.biz and take a look at the DMOS tutorial article in the engineering pages.