By Michiel Steyaert (Editor), Arthur H.M. van Roermund (Editor), Johan H. Huijsing (Editor)
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Additional resources for Analog Circuit Design: Structured Mixed-Mode Design, Multi-Bit Sigma-Delta Converters, Short Range RF Circuits
For example the cost for the required gm is calculated as: 42 To the basic set of requirements some other costs are added that ensure for example that no transistors are in the subthreshold region or that the input and output common-mode voltage are the same. Also a cost proportional to the total power consumption is added to obtain a minimal power solution. To start with, a differential input signal with a voltage swing of 300mV is applied. A fairly small population of 25 is randomly chosen by the genetic algorithm.
The new two-port has equations can then be written as: 55 where and can formally be found from the equations of the original device. The advantage of the generic modelling is that it fits to all three-terminal devices, whether it is a bipolar transistor, a field-effect device or even a vacuum tube. g. balancing). 2. As for the ideal amplifier types discussed in section 3, a linear two-port model using transmission parameters will be used for investigating the influence of error-reduction techniques on small-signal and noise behavior: where A, B, C, and D are in general complex quantities representing the transmission parameters.
Solutions with operational amplifiers (op-amp) using local feedback consume too much power or do not have a high enough bandwidth compared to the gm-C solutions. 3 Implementation step The gm-C implementation can be divided in two mainstream solutions: the LC-ladder simulation and the cascade realization. Although reasons for choosing one or the other are not always straightforward, a first-order selection rule is as follows. If you want to realize a high-order filter with a high Q or with a sharp magnitude cutoff or a filter that has low passband sensitivity to component tolerances, then an LC-ladder simulation is a good choice.
Analog Circuit Design: Structured Mixed-Mode Design, Multi-Bit Sigma-Delta Converters, Short Range RF Circuits by Michiel Steyaert (Editor), Arthur H.M. van Roermund (Editor), Johan H. Huijsing (Editor)