Tunable Digital Filter for the ALMA Correlator - RadioNet
Tunable Digital Filter for the ALMA Correlator - RadioNet
Tunable Digital Filter for the ALMA Correlator - RadioNet
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<strong>Digital</strong> Backend Meeting MPIfR Bonn - Sep 6, 2004Overlapping subchannels• An overlap of 1-2 channels improve dramatically <strong>the</strong> spectralaccuracy• Some band lost at <strong>the</strong> edges of <strong>the</strong> whole 2 GHz band• In principle can be done with polyphase, but requires change ofrate in <strong>the</strong> data clock or radix-17 FFT• Adopted solution: complete digital receiver with tunable LO• filter requirements less stringent (2Ktaps)• fur<strong>the</strong>r simplified using a 2-stage FIR• Amplitude accuracy ~0.2%• Phase ~0.5 deg
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