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.
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:
The filter response is shown, along with the unfiltered spectrum (blue) and the filtered spectrum (black).
The Time Domain plot can also be viewed:
The filter effect on the waveshape can be clearly seen, in the form of pulse edge rounding and the introduction of ripple.