By Willy M Sansen
This booklet is entitled Analog layout necessities since it includes all themes of significance to the analog clothier that are necessary to receive adequate insights to do a radical task.
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Extra info for Analog Design Essentials (The Springer International Series in Engineering and Computer Science)
It resembles somewhat, a diode characteristic. We will use this simple circuit to convert current to voltage. 0218 If we add a small-signal current to the DC current, then we ﬁnd the small-signal equivalent circuit, as shown. The small-signal resistance r is then 1/g in pards m allel with the transistor output resistance r . Since DS the latter one is always signiﬁcantly larger than 1/g , m it can be simpliﬁed to 1/g m itself. The small-signal resistance of a diode connected MOST is thus always 1/g , m very much as for a bipolar transistor.
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. Speed is another point of comparison. At high currents all electrons move at the speed of v . sat As a result the highest speed device is the one with the smaller dimension the channel length L or the Base width W .
This is an enormous disadvantage for many circuits! The second consideration is on the minimum V . It is the minimum output voltage for DSsat which the MOST operates in saturation, exhibiting a large output resistance r , and thus o large gain. 0185 The minimum V , for which the MOST operates in saturation, is little less than V −V , DSsat GS T which also sets the current depending on the transistor dimensions W and L. 2 V. The voltage loss V is DSsat also small. 5 V. 5 V without losing gain. This creates a severe limitation in output swing.