Editing Analog sampled filter

{{Short description|Electronic filter using switched capacitors}}
{{Unreferenced|date=December 2009}}
{{merge to|Switched capacitor|date=January 2025|discuss=Talk:Switched_capacitor#Merge_from_Analog_sampled_filter}}

An '''analog sampled filter''' an [[electronic filter]] that is a [[Hybrid integrated circuit|hybrid]] between an [[analog filter|analog]] and a [[digital filter]]. The input is an [[analog signal]], and usually stored in [[capacitor]]s. The [[time domain]] is [[Discrete time|discrete]], however. Distinct analog samples are shifted through an array of holding capacitors as in a [[bucket brigade]]. Analog adders and amplifiers do the arithmetic in the signal domain, just as in an [[analog computer]].

Note that these filters are subject to [[aliasing]] phenomena just like a digital filter, and [[anti-aliasing filter]]s will usually be required. See {{slink|Filter design|Anti-aliasing}}.

Companies such as [[Linear Technology]] and [[Maxim Integrated Products|Maxim]] produce [[integrated circuit]]s that implement this functionality. Filters up to the 8th order may be implemented using a single chip. Some are fully configurable; some are pre-configured, usually as [[low-pass filter]]s.

Due to the high filter order that can be achieved in an easy and stable manner, single chip analog sampled filters are often used for implementing anti-aliasing filters for digital filters. The analog sampled filter will in its turn need yet another anti-aliasing filter, but this can often be implemented as a simple 1st order low-pass [[analog filter]] consisting of one series [[resistor]] and one [[capacitor]] to [[ground (electricity)|ground]].

{{DEFAULTSORT:Analog Sampled Filter}}
[[Category:Linear filters]]
[[Category:Electronic circuits]]