By Gabriele Manganaro
Have to wake up to hurry quick at the newest advances in excessive functionality facts converters? wish support determining the simplest structure in your software? With every thing you must find out about the major new converter architectures, this advisor is for you. It provides easy ideas, circuit and process layout innovations and linked trade-offs, getting rid of long mathematical proofs and supplying intuitive descriptions prematurely. every thing from time-to-digital converters to comparator-based/zero-crossing ADCs is roofed and every subject is brought with a brief precis of the basic fundamentals. useful examples describing real chips, besides large comparability among architectural or circuit strategies, ease structure choice and assist you minimize layout time and engineering hazard. Trade-offs, benefits and drawbacks of every alternative are placed into viewpoint with a dialogue of destiny tendencies, exhibiting the place this box is heading, what's riding it and what an important unanswered questions are.
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Additional resources for Advanced data converters
So, for example, if the ADC or the DAC suffered from a static nonlinearity, a (digital) model9 for this nonlinear function f (x) could be created and its parameters estimated. Then, an inverse function f −1 (y) is digitally created and applied to the data stream at the output of the ADC or to that at the input of the DAC in order to cancel out the nonlinearity itself: f −1 ( f (x)) = x. The purpose of the calibration, in this example, is to determine the proper f −1 (y). Clearly, having a mix of analog and digital estimation and calibration can be optimal in many cases as well.
As stated, this is a potential, and that is a critical point, because complex calibration algorithms can require quite some time as well, and, since it is often required that the device be completely calibrated before ATE testing is completed, it can, again, lead to the same cost issue as has already been mentioned in the case of factory trimming. A further distinction in the context of calibration refers to when that is performed. In particular, a data converter can be calibrated while it is performing the regular conversion operation, and the result of the conversion must not be affected by the calibration process itself.
If R0 is set to a nominal value of R0 = 90 and the smaller resistors are set to R1 = 5 then, neglecting the contact resistances, the nominal value of R could be set as R = 90, 95, 100, 105, or 110 , depending on which contact is shorted. However, now the precision has improved to the desired level. 5 ). 6 ). g. e. we decided which one of the five contacts would have led to the desired value for R), and, finally, in order to be able to use the resistor at its desired value, we held the effect of the corrective action (by permanently shorting one of the five contacts).