Analog Design Essentials (The Springer International Series by Willy M Sansen

By Willy M Sansen

This e-book is entitled Analog layout necessities since it includes all subject matters of significance to the analog dressmaker that are necessary to receive adequate insights to do a radical activity.

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Ultimately, it is the standardization of the model that is of primordial importance. The model that is most used is the most important one, whatever the quality is of that model. 0172 If a new model is being used, it is wise to check a few weaknesses which used to be around in older models. A short list is given in the slide. Comparison of MOST and bipolar transistors 39 The two transition points on either side of the stronginversion region must be checked. This means that we have to have a look at the continuity of the current itself and its first derivative.

This is only possible however, if its V DS2 is quite small, between 100 and 200 mV. This is also the difference between the V ’s GS of the two transistors. It is not that easy to track the parameters of both transistors. Indeed, MOST M1 works in saturation, involving parameter K∞, whereas transistor M2 operates as a resistor, with parameter KP. They differ by parameter n, which is always uncertain. Amplifiers, source followers and cascodes 59 0217 Parallel feedback can be applied to a single transistor as well, which results in a diode-connected transistor.

From the choice of L, W is calculated. 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.

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