Inside the 1902
57
The analogue filter daughterboard is built to implement 2nd-
order filters with 12 dB per octave roll-off. The standard
configuration is Butterworth, optimised for flatness of response
before the corner frequency; Bessel or Chebyshev polynomials
can also be supplied to special order. The corner frequencies
and the response are determined by the precise value of the
resistors and capacitors fitted. High-frequency and low-
frequency sections each have four selectable positions,
including straight-through. The high-pass filter comes before
the low-pass filter.
CED1902-03 – the filter daughterboard
If the digital filter has been implemented, this daughterboard is
omitted, and the digital filter components are fitted in its place.
For details of the digital filter see page 10.
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