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difference between integrator and low pas filter

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pankaj jha

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; can anybody explain me the difference between a differentiator and high pass filter... with some circuit if possible...
also...
can anybody explain me the difference between a integrator and low pass filter... with some circuit if possible...
 

An integrator and LPF are the same thing.
In order to understand the link between a low pass filter and an integrator, you must understand what integration means in this context.
Integration is, in this case, the average signal level. This is in fact the DC bias level. So an lpf will in fact only leave us with the low frequency content, which will be close (ideally) to the DC level of the signal.

With a HPF we want the exact opossit. We want to get only the short-fast changes and discard the DC bias level. Showing the small differences and discarding the DC level.
This is exactly what an HPF is used for.
 

An integrator is a one pole low pass filter with the pole at zero frequency. (The implementation in the real world puts the pole near, but not exactly, at DC.) A low pass filter can have many poles, and in certain cases zeros, at all sorts of complex frequencies.
 

edadla, LPF has finite DC gain. In case of simple RC-circuit it is equal to 1. Integrator has infinite DC gain. RC-circuit acts as integrator when C is infinite, but integration result is very small.
Differentiator has infinite gain at infinite frequency, when HPF has finite gain at infinite frequency.
 

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