Improved filter design.

The now discarded Feature SP-1570 captured "additional feature have been proposed as result of CDR suggestions and ECP. These features were not present in the SPS DDD document. Some of them require an ECP to be raised, or respond to an ECP which changed L1 specifications. Some of the requirements do not have an ECP and are desirable, but not necessary to achieve" This feature aims to address the following recommendation:

In section 4.2.8 of the Low Signal chain document SKA-TEL-SKO-0000793 it is recommended to improve the combined LFAA+CSP frequency response, increasing the stopband rejection. This is possible to achieve by optimizing the LFAA filter tap coefficients, without changing the hardware design. As the ripple in the combined response is lower than the sum of the ripple in the two responses it is possible to trade more passband ripple for improved stopband attenuation. Most of this design work and the associated impact on the SKA-low spectral response has already been completed.