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- W2317684753 abstract "According to Nyquist's theorem, digital-to-analog converters have a usable signal bandwidth up to half their sampling frequency. It is however impractical to generate such high frequency signals. This is due to the fact that the converter will not only generate the desired signal itself but also, often undesired, image signals. For frequencies near the Nyquist frequency an image with almost exactly the same amplitude appears very close to the signal. Should the application require such high frequencies to be generated, an extremely steep filter is required to filter off the Nyquist images. These filters are very expensive in terms of power and system cost. Therefore real life systems locate the Nyquist-image further away from the wanted signal by increasing the sample rate. We propose a technique that removes the lower Nyquist-images so that only further away Nyquist-images have to be filtered off, enabling the use of simple filters. The technique consists of summing together the outputs of two or more sub-converters. By applying the popper input-and clock signals the Nyquist image bands can be greatly reduced. The quality of this image band suppression is only dependent on the clock synchronization between the used sub-converters. Parallel-Path D/A converters allow for a significant reduction in power consumption due to lower clock frequencies for the used converters. They also exhibit lower quantisation noise when compared to their functionally equivalent counterparts. To validate the technique a 6-bit current-steering D/A converter operating at 250Msps has been implemented in a 0.18u CMOS technology. The measurements support the developed theory." @default.
- W2317684753 created "2016-06-24" @default.
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- W2317684753 date "2005-01-01" @default.
- W2317684753 modified "2023-09-24" @default.
- W2317684753 title "Parallel-path D/A converters for near-Nyquist signal generation" @default.
- W2317684753 doi "https://doi.org/10.1049/cp:20050134" @default.
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