RF Block Set RF Filter transfer function changes with sample time
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Implemented a chebshev low pass RF filter in RF blockset:
filter order: 3 ;
pass band frequency: 10MHz ;
pass band attenuation: 1dB ;
Input frequency: 1MHz, 5MHz, 10MHz.
From filter visualization: attenuation at the above 3 frequencies is 0dB, 1dB, 1dB.
If I set RF config sample time to be 120MHz, the simulation result at the above 3 frequencies is 0dB, 1dB, 2dB.
If I set RF config sample time to be 480MHz, the simulation resutl at the above 3 frequencies is 0dB, 1dB, 1dB (same as filter visualization)
It does seem it has to do with circuit envelope algorithem.
Can some one shed more lights?
Thanks,
George
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2021-4-3
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