By L. R. A. Casse

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Extra info for Combinatorial Mathematics X. Proc. conf. Adelaide, 1982

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4 General Conclusions for the Three Primary OTA Stages For similar applications, requiring similar bandwidth OTAs, the telescopic OTA uses only half the power and generates only half the noise of either the current mirror or folded OTAs. The main reason for using either the current mirror or folded OTAs is increased signal range, especially when the input and output reference voltages are the same. Although, in theory, the input and output current biasing can be different, in practice they are chosen about the same (with the folded OTA needing some extra output current as explained above), with similar Von’s being used throughout.

The condition for which both sources of mismatch make an equal contribution to the random input offset voltage is defined by the corner Von voltage, VonC : VonC = 2 ◊ AVT Aβ . 0V. 20) dominate the β mismatch terms. Von p is often two to three times larger than Vonn for the following main reasons. Since the PMOST current sources don’t need to have a large gm, β p of the PMOST current sources is usually a lot less than βn of the input stage. Secondly, the PMOST current sources are usually designed with non-minimum gate lengths in order to create a reasonably high output resistance.

3. Design Procedure for Optimized Settling 29 when determining the Von, where the simplified single-dimensional MOST model is no longer totally accurate [38]. The first effect of interest is vertical field mobility degradation, where the field between the gate and the channel causes the charge carriers in the channel to slow down for high gate-source voltages due to the increasing pull on the inversion layer towards the gateoxide silicon interface. 23) θ1 is a process dependent where µ0 is the low field mobility (typically, 5 ¥ 1010 µ m2V-1s-1), and o 24 A factor inversely proportional to the oxide thickness (typically V-1).

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