Westbay Waveform Master

Basic Filters Facility

    An important use of Waveform Master is to consider the impact of frequency response on a particular signal. This can take the form of a filter network, or the bandwidth frequency response of a circuit for instance.

    The Basic Filters facility offers a choice of four 'idealised' filters, their characteristic being low-pass, high-pass, band-pass and band-stop. They are idealised in that the cut-off rates are set at any required value, and are not dependant on electrical components for example.

    The Basic Filters form is shown below.

Basic_Filters.bmp (290214 bytes)

    A 1MHz trapezoidal wave has been defined in the Standard Waves facility, and a 3MHz Low- Pass Filter, with a cut-off rate of 40dB/decade in the Basic Filters form.

    The Fourier Spectral plot for the unfiltered and the filtered wave are shown first:

Basic_Filters_Fourier.bmp (632454 bytes)

    The filter response is shown, along with the unfiltered spectrum (blue) and the filtered spectrum (black).

    The Time Domain plot can also be viewed:

Basic_Filters_Time.bmp (631170 bytes)

    The filter effect on the waveshape can be clearly seen, in the form of pulse edge rounding and the introduction of ripple.

 

Westbay Technology Ltd, Main Street, Baycliff, Ulverston, Cumbria LA12 9RN, England

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