?? filter_functions_header.vhd
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-- ------------------------------------------------------------- -- Additional material to the book-- Modeling and Simulation for RF System Design-- ---- THIS MODEL IS LICENSED TO YOU "AS IT IS" AND WITH NO WARRANTIES, -- EXPRESSED OR IMPLIED. THE AUTHORS SPECIFICALLY DISCLAIM ALL IMPLIED -- WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.-- THEY MUST NOT HAVE ANY RESPONSIBILITY FOR ANY DAMAGES, FINANCIAL OR-- LEGAL CLAIMS WHATEVER.-- ------------------------------------------------------------- Name: Lowpass filter-- -- Description:-- This part describes the filter package with functions for-- computation of lowpass filter coefficients---- Literature:-- ---- Dependencies: -- ------------------------------------------------------------- Logical Library Design unit-- ------------------------------------------------------------- IEEE MATH_REAL-- --------------------------------------------------------------- Source:-- filter_functions_header.vhd-- -----------------------------------------------------------library IEEE; use IEEE.MATH_REAL.all;package FILTER is -- ------------------------------------------------------------------------- -- Coefficients for normalized lowpass filter -- -- LP(s) = 1.0 / (1 + a*S + b*S^2) -- ------------------------------------------------------------------------- function LOWPASS_BUTTERWORTH_A (GRAD : INTEGER) -- grade of filter return REAL_VECTOR; -- array with filter coefficients function LOWPASS_BUTTERWORTH_B (GRAD : INTEGER) -- grade of filter return REAL_VECTOR; -- array with filter coefficientsend package FILTER;
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