N-Path Filters
Автор: ISSCC Videos
Загружено: 2017-04-28
Просмотров: 6493
Back in the 1960’s quite some research was carried out on so called “N-path filters”. These filters exploited down conversion, filtering and up conversion. This way band-pass filters could be made from simple low-pass filters. The techniques lost attention because the matching of capacitors turned out to be a problem and soon “real” oversampled Switched Capacitor filters took over attention, which have become classical. However in modern nanometer CMOS the capacitor matching is almost perfect and the speed of down and up-converters is well in the GHz range, which makes it worth to have a look at these techniques and to revisit and improve the architectures. After intuitively discussing the basics of N-path filters, briefly several examples of recently published N-path filters will be shown. These filters are tunable with a clock signal and show very high Q characteristics, which were until recently only thinkable with SAW or BAW technologies.
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