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Op amp non investing low pass filter
Автор: Vole | Category: Kraken crypto radar | Октябрь 2, 2012Another important feature is the final slope of the roll off. This is generally governed by the number of 'poles' in the filter. Normally there is one pole for each capacitor and inductor in a filter. When plotted on a logarithmic scale the ultimate roll-off becomes a straight line, with the response falling at the ultimate roll off rate.
This is 6dB per pole within the filter. This a filter with a single capacitor rolls off at 6dB per octave, but a low pass filter with two capacitors and an inductor would roll off at 18dB per octave. Traditional passive low pass filters may use resistors and capacitors, or for those with better performance indicators and capacitors can be used.
However inductors are expensive and especially at low frequencies they are also to be avoided because of their size. As a result of this, active low pass filters are a much better option for many areas of electronic circuit design. What is an active filter There are both active and passive filters that can be used in electronic circuit design. As the name indicates a passive filter is one that uses only passive electronic components: inductors, capacitors and resistors An active filter is one that uses active electronic components: namely amplifiers.
Often active filters use op amp circuits as these lend themselves to adding filter components, especially involving the negative feedback loop. By using an active filter approach, better performance can be obtained: the use of an amplifier such as an operational amplifier prevents following stages loading the filter and impairing its performance. Also an active filter can have complex poles and zeros without needing to use bulky expensive inductors, making the filter relatively easy to implement using resistors and capacitors as the external electronic components.
A further advantage of an active filter is that the shape of the response, the Q or quality factor, and the frequency can often be set with inexpensive variable resistors. In some active filter circuits, one parameter can be adjusted without affecting the others. Best Answer can anyone explain why this circuit behaves like a low pass filter despite having no capacitor in the feedback loop?
All op-amp amplifiers will behave like low pass filters due to parasitic capacitance between the output and, in your circuit, the inverting input. If there is 2 pF present then it forms a low pass filter with the kohm feedback resistor having a 3 dB point of about kHz. This problem would be improved by choosing an input resistor of 1 kohm and a feedback resistor of 40 kohm. However, the is pretty crappy so you will be unlikely to get a ten times improvement in frequency response.
Inside virtually every op-amp are compensation capacitors; these limit the frequency response in order to maintain closed-loop stability. As Tony Stewart mentioned in his comment, this has a significant effect on frequency response when higher closed-loop gain is required.
See the picture below for the closed loop gain 40 dB of a and note that your circuit has a closed loop gain of 32 dB: - So, the closed loop response starts to fall from 40 dB gain at around 50 kHz. With your circuit gain of 32 dB you might see the fall in gain around 70 kHz. Picture taken from this useful document entitled "Frequency response of op-amps".
See also my answer here on a very related subject.

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