目標：
實現帶阻濾波器。參數如下：
阻帶頻率1：100KHz；
阻帶頻率2：300KHz；
通過頻率1：50KHz；
通過頻率2：350KHz；
通帶波動：<1dB；
阻帶衰減：>40dB。
ip核coe 文件：
; XILINX CORE Generator™Distributed Arithmetic FIR filter coefficient (.COE) File
; Generated by MATLAB® 9.2 and the DSP System Toolbox 9.4.
; Generated on: 07-Jun-2020 11:37:46
Radix = 16;
Coefficient_Width = 16;
CoefData = 02ec,
fee3,
ff5b,
0017,
00d5,
010b,
0066,
ff49,
fe92,
fed8,
ffc4,
0045,
ff8e,
fdfb,
fce4,
fd62,
ff2b,
00a3,
005b,
fe91,
fd41,
fe62,
01db,
0534,
05a5,
02e8,
000b,
011f,
0745,
0e98,
1045,
07b9,
f6fc,
e66a,
5f84,
e66a,
f6fc,
07b9,
1045,
0e98,
0745,
011f,
000b,
02e8,
05a5,
0534,
01db,
fe62,
fd41,
fe91,
005b,
00a3,
ff2b,
fd62,
fce4,
fdfb,
ff8e,
0045,
ffc4,
fed8,
fe92,
ff49,
0066,
010b,
00d5,
0017,
ff5b,
fee3,
02ec;
詳細實現步驟可參考之前的博文。
`timescale 1ns / 1ps
//////////////////////////////////////////////////////////////////////////////////
// Company:
// Engineer:
//
// Create Date: 2020/06/07 11:43:39
// Design Name:
// Module Name: bandstop
// Project Name:
// Target Devices:
// Tool Versions:
// Description:
//
// Dependencies:
//
// Revision:
// Revision 0.01 - File Created
// Additional Comments:
//
//////////////////////////////////////////////////////////////////////////////////
module bandstop(
input clk,
input s_axis_data_tvalid,
input s_axis_data_tvalid_1,
output [15:0]m_axis_data_tdata_0,
output [15:0]m_axis_data_tdata_1,
output [15:0]m_axis_data_tdata_2,
output [16:0]s1,//44+200
output [16:0]s2,//200+400
output [39:0]m_axis_data_tdata_fir,
output [39:0]m_axis_data_tdata_fir1
);
wire event_pinc_invalid_0,event_pinc_invalid_1,event_pinc_invalid_2;
wire event_poff_invalid_1,event_poff_invalid_0,event_poff_invalid_2;
wire m_axis_phase_tvalid_0,m_axis_phase_tvalid_1,m_axis_phase_tvalid_2;
wire m_axis_phase_tdata_0,m_axis_phase_tdata_1,m_axis_phase_tdata_2;
wire m_axis_data_tvalid1,m_axis_data_tvalid2,m_axis_data_tvalid0;
//44kHz
dds_compiler_0 dds0 (
.aclk(clk), // input wire aclk
.m_axis_data_tvalid(m_axis_data_tvalid0), // output wire m_axis_data_tvalid
.m_axis_data_tdata(m_axis_data_tdata_0), // output wire [15 : 0] m_axis_data_tdata
.m_axis_phase_tvalid(m_axis_phase_tvalid_0), // output wire m_axis_phase_tvalid
.m_axis_phase_tdata(m_axis_phase_tdata_0), // output wire [15 : 0] m_axis_phase_tdata
.event_pinc_invalid(event_pinc_invalid_0), // output wire event_pinc_invalid
.event_poff_invalid(event_poff_invalid_0) // output wire event_poff_invalid
);
//200kHz
dds_compiler_1 dds1 (
.aclk(clk), // input wire aclk
.m_axis_data_tvalid(m_axis_data_tvalid1), // output wire m_axis_data_tvalid
.m_axis_data_tdata(m_axis_data_tdata_1), // output wire [15 : 0] m_axis_data_tdata
.m_axis_phase_tvalid(m_axis_phase_tvalid_1), // output wire m_axis_phase_tvalid
.m_axis_phase_tdata(m_axis_phase_tdata_1), // output wire [15 : 0] m_axis_phase_tdata
.event_pinc_invalid(event_pinc_invalid_1), // output wire event_pinc_invalid
.event_poff_invalid(event_poff_invalid_1) // output wire event_poff_invalid
);
//400kHz
dds_compiler_2 dds2(
.aclk(clk), // input wire aclk
.m_axis_data_tvalid(m_axis_data_tvalid2), // output wire m_axis_data_tvalid
.m_axis_data_tdata(m_axis_data_tdata_2), // output wire [15 : 0] m_axis_data_tdata
.m_axis_phase_tvalid(m_axis_phase_tvalid_2), // output wire m_axis_phase_tvalid
.m_axis_phase_tdata(m_axis_phase_tdata_2), // output wire [15 : 0] m_axis_phase_tdata
.event_pinc_invalid(event_pinc_invalid_0), // output wire event_pinc_invalid
.event_poff_invalid(event_poff_invalid_1) // output wire event_poff_invalid
);
c_addsub_0 add1 (
.A(m_axis_data_tdata_0), // input wire [15 : 0] A
.B(m_axis_data_tdata_1), // input wire [15 : 0] B
.S(s1) // output wire [16 : 0] S
);
c_addsub_1 add2 (
.A(m_axis_data_tdata_1), // input wire [15 : 0] A
.B(m_axis_data_tdata_2), // input wire [15 : 0] B
.S(s2) // output wire [16 : 0] S
);
wire s_axis_data_tready;
wire m_axis_data_tvalid_f1;
wire m_axis_data_tvalid_f0;
fir_compiler_0 fir1 (
.aclk(clk), // input wire aclk
.s_axis_data_tvalid(s_axis_data_tvalid_1), // input wire s_axis_data_tvalid
.s_axis_data_tready(s_axis_data_tready), // output wire s_axis_data_tready
.s_axis_data_tdata(s1), // input wire [23 : 0] s_axis_data_tdata
.m_axis_data_tvalid(m_axis_data_tvalid_f0), // output wire m_axis_data_tvalid
.m_axis_data_tdata(m_axis_data_tdata_fir) // output wire [39 : 0] m_axis_data_tdata
);
fir_compiler_1 fir2 (
.aclk(clk), // input wire aclk
.s_axis_data_tvalid(s_axis_data_tvalid), // input wire s_axis_data_tvalid
.s_axis_data_tready(s_axis_data_tready), // output wire s_axis_data_tready
.s_axis_data_tdata(s2), // input wire [23 : 0] s_axis_data_tdata
.m_axis_data_tvalid(m_axis_data_tvalid_f1), // output wire m_axis_data_tvalid
.m_axis_data_tdata(m_axis_data_tdata_fir1) // output wire [39 : 0] m_axis_data_tdata
);
endmodule
`timescale 1ns / 1ps
//////////////////////////////////////////////////////////////////////////////////
// Company:
// Engineer:
//
// Create Date: 2020/06/07 13:18:49
// Design Name:
// Module Name: tb_bandstop
// Project Name:
// Target Devices:
// Tool Versions:
// Description:
//
// Dependencies:
//
// Revision:
// Revision 0.01 - File Created
// Additional Comments:
//
//////////////////////////////////////////////////////////////////////////////////
module tb_bandstop(
);
reg s_axis_data_tvalid;
reg s_axis_data_tvalid_1;
reg clk;
// reg m_axis_data_tvalid;
wire [15:0]m_axis_data_tdata_0;
wire [15:0]m_axis_data_tdata_1;
wire [15:0]m_axis_data_tdata_2;
wire [16:0]s1;//44+200
wire [16:0]s2;//200+400
wire [39:0]m_axis_data_tdata_fir;
wire [39:0]m_axis_data_tdata_fir1;
bandstop u1(.clk(clk),.m_axis_data_tdata_0(m_axis_data_tdata_0),.m_axis_data_tdata_1(m_axis_data_tdata_1),
.m_axis_data_tdata_2(m_axis_data_tdata_2),.s1(s1),.s2(s2),.s_axis_data_tvalid(s_axis_data_tvalid),.m_axis_data_tdata_fir(m_axis_data_tdata_fir),
.m_axis_data_tdata_fir1(m_axis_data_tdata_fir1),.s_axis_data_tvalid_1(s_axis_data_tvalid_1));
initial begin
s_axis_data_tvalid<=1'b1;
s_axis_data_tvalid_1<=1'b1;
clk<=1'b0;
end
always #5 clk<=~clk;
endmodule
s1,s2爲混合波，分別對其進行濾波後可發現只剩下阻帶外頻率的信號。