The transfer function of a passive bandpass filter has one zero and two poles.(adsbygoogle = window.adsbygoogle || []).push({});

The filter is:

Signal -> L -> C -> R -> Gnd,

where the signal is the input and the voltage across R is the output.

[itex]H(s) = \frac{sRC}{s^2LC+sRC+1}[/itex]

Initial value theorem states that it's impulse response has an initial value of R/L. How can this be? The system filters out high frequencies, so it should not be able to change its voltage instantaneously in response to an impulse.

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# Effect of zeros on impulse response

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