By Ian Hickman
Electronic garage oscilloscopes have lengthy when you consider that thoroughly supplanted analog garage oscilloscopes and feature reached a level of class and function which allow them to rival the main complex genuine time oscilloscopes. during this entire guide, which gives a pragmatic vade mecum for the engineer, Ian Hickman describes how they paintings and the way to take advantage of them to most sensible virtue. quite a lot of versions is on the market. This booklet incorporates a consultant to all makes and types and may be top stored beside the software for immediate reference. it's going to even be a so much valuable advisor to the topic for college students and trainees. Ian Hickman is an skilled clothier and writer of best-selling titles together with 'Oscilloscopes: tips to Use Them, How They Work', Newnes functional Radio Frequency Handbook', 'Analog Electronics' and 'Analog Circuits Cookbook'.
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Example text
Then the value of each sample actually displayed is calculated as 1/16th of the sample just taken plus 15/16ths of the corresponding sample displayed (not taken) on the previous acquisition. Thus any aberration from the true value of the signal due to noise on the sample will be reduced by a factor of 16. The currently displayed value is mainly determined by the last n samples, where n equals 16 in the sample just quoted. he current sample is reduced to 15/16ths before adding 1/16th of the new sample, after 16 new samples it will be reduced to (15/16) ~s or 38 per cent.
Of the comparators whose inverting inputs are connected to a reference voltage less than this will output a logic 1, while all the rest will output logic 0. The decode logic converts this result to the corresponding n-bit binary number and outputs this to the external world. Clearly, with this type of converter, the digital result representing the input analog voltage is available continuously; no commence conversion command is necessary. By contrast, it is clear that for an SAR type of ADC to operate correctly, the input signal must not change by even the smallest amount during the course of a conversion.
2 A flash analog to digital converter. ) capacitor during a hold period, when the switch is open. The switch is opened by the leading edge of the start conversion command to the ADC, and closed again as soon as the conversion is complete. Thus the voltage on the hold capacitor is forced to follow the input voltage until frozen again at the start of the next sample. This technically makes it a track and hold rather than a sample and hold, but when sampling at the maximum possible rate, there is of course no difference.