By Willy M Sansen
This publication is entitled Analog layout necessities since it includes all subject matters of value to the analog fashion designer that are necessary to receive enough insights to do an intensive task.
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Additional resources for Analog Design Essentials (The Springer International Series in Engineering and Computer Science)
The total transconductance g is then always smaller than the smaller one of both. m In this way an expression is obtained with both W and L, and obviously V −V . This GS T expression will be used later on to optimize some high-speed circuits, but also operational ampliﬁers. For a speciﬁc V −V , this total transconductance is easily plotted versus channel length L, GS T as shown next. 28 Chapter #1 0151 For a speciﬁc V −V , the GS T total transconductance is easily plotted versus channel length L, as shown next.
In general, for high-gain stages the L is chosen 4–8 times the minimum L, for high-speed stages the L is chosen minimal. 0188 After the diﬀerence in design plan (number 4), we have a look at the accuracy of the models (number 5). A MOST needs three models to cover the whole current range, and many transistor parameters, which is expanding continuously. A bipolar transistor only needs one single model, which is quite precise. Moreover, it has had the same model for years. This single model is valid over a large number (more than 7), of decades in current, contrary to a MOST, where one model is valid over only 1 or 2 decades in current.
GS The resulting expression is a useful tool to predict high-frequency performance. It will be used in many later Chapters to establish upper limits of frequency performance. Obviously, the transition values of channel length L, for speciﬁc values of V −V are the GS T same as for the transconductance g . 2 V, channel lengths below 65 nm provide m GS T operation fully in velocity saturation. Comparison of MOST and bipolar transistors 35 0165 At low currents, the absolute values of the transconductance g are low, m yielding low values for frequency f as well.
Analog Design Essentials (The Springer International Series in Engineering and Computer Science) by Willy M Sansen