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band pass filter

Discussion in 'Electronic Design' started by sperelat, Aug 30, 2007.

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  1. sperelat

    sperelat Guest

    I'm trying to simulate pulse transmitted through bandpass filter
    (actually ,it is APD that has band pass type frequency response)

    One of the problem is that the frequency respons is not like a
    band pass filter.

    It is like a high-pass filter for low frequency and,like a low-pass

    for high frequency.

    I don't know how to get the

    transfer function of such a filter,

    Can I just multiply transfer funtions of two-filters?
  2. Tom Bruhns

    Tom Bruhns Guest

    Is it a linear, time-invariant system? If so, then yes. But...beware
    that the transfer functions you have for the two filters were almost
    certainly developed for those filters driven from particular source
    impedances, and operating into particular load impedances. Generally
    those are resistive sources and loads. When you cascade passive
    reflective filters (e.g. LC ladder filters), the first filter no
    longer "sees" a pure load resistance, and the second filter no longer
    "sees" a pure source resistance.

    These days, it's convenient to use computer simulations for filter
    evaluation. There are several good programs specifically devoted to
    filters of various types, and Spice (e.g. LTSpice) can do a reasonable
    job with most filters.

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