An analog sampled filter an
electronic filter
Electronic filters are a type of signal processing filter in the form of electrical circuits. This article covers those filters consisting of lumped-element model, lumped electronic components, as opposed to distributed-element filters. That ...
that is a
hybrid between an
analog and a
digital filter
In signal processing, a digital filter is a system that performs mathematical operations on a Sampling (signal processing), sampled, discrete-time signal to reduce or enhance certain aspects of that signal. This is in contrast to the other ma ...
. The input is an
analog signal, and usually stored in
capacitors. The
time domain is
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
An analog computer or analogue computer is a type of computation machine (computer) that uses physical phenomena such as Electrical network, electrical, Mechanics, mechanical, or Hydraulics, hydraulic quantities behaving according to the math ...
.
Note that these filters are subject to
aliasing phenomena just like a digital filter, and
anti-aliasing filters will usually be required. See .
Companies such as
Linear Technology and
Maxim
Maxim or Maksim may refer to:
Entertainment
*Maxim (magazine), ''Maxim'' (magazine), an international men's magazine
** Maxim (Australia), ''Maxim'' (Australia), the Australian edition
** Maxim (India), ''Maxim'' (India), the Indian edition
*Maxim ...
produce
integrated circuit
An integrated circuit (IC), also known as a microchip or simply chip, is a set of electronic circuits, consisting of various electronic components (such as transistors, resistors, and capacitors) and their interconnections. These components a ...
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 filters.
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
Analogue Filter (signal processing), filters are a basic building block of signal processing much used in electronics. Amongst their many applications are the separation of an audio signal before application to bass (music), bass, mid-range sp ...
consisting of one series
resistor and one
capacitor to
ground.
{{DEFAULTSORT:Analog Sampled Filter
Linear filters
Electronic circuits