15 Channel anti-aliasing filter board

The filter board provides anti-aliasing filtering for up to 15 channels of analog signals. It is usually inserted between the analog processing board (ASTP) and the Analog-to-Digital Converter board (ADC) to suppress the aliasing of signals above the Nyquist frequency. The board uses elliptic filter modules (DP68L8EY) manufactured by Frequency Devices. These modules have a sharp pass-band to stop-band transition and high stop-band attenuation (-100 dB) . The filter characteristics are shown in Figures 3-5. Signal inputs and outputs are via the standard analog bus 16-channel, 20-conductor ribbon cable. Signals that do not need filtering are configured for pass-through by inserting a jumper instead of a filter module. Channel 0 is always a pass-through while channels 1-15 are available for filtering.

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