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Sallen Key Lowpass Butterworth Filter Calculator

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This calulator allows you to calculate filter component values of Sallen Key Lowpass Butterworth and Bessel Filter. See the frequency and phase response of filter in by clicking PLOT GRAPH button. First calculate component values of Filter by clicking COMPUTE and then click on Plot Graph button to get response of filter. Sallen Key Lowpass Filter Input Output R1 (Ohms)   Cutoff Freq (Hz)   R2 (Ohms)   C1 (F)   C2 (F)   Plot Response Actual Cutoff Frequency (Hz)   Q Filter Response
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Verilog: 8 to 1 Multiplexer (8-1 MUX) Dataflow Modelling with Testbench Code

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  Verilog Code for 8 to 1 Multiplexer Dataflow Modelling module mux_8to1(     input a, input b, input c, input D0, input D1, input D2, input D3, input D4, input D5, input D6, input D7, output out, ); module m81( output out, input D0, D1, D2, D3, D4, D5, D6, D7, S0, S1, S2); assign S1bar=~S1; assign S0bar=~S0; assign S2bar=~S2; assign out = (D0 & S2bar & S1bar & S0bar) | (D1 & S2bar & S1bar & S0) | (D2 & S2bar & S1 & S0bar) + (D3 & S2bar & S1 & S0) + (D4 & S2 & S1bar & S0bar) + (D5 & S2 & S1bar & S0) + (D6 & S2 & S1 & S0bar) + (D7 & S2 & S1 & S0); endmodule //Testbench code for 8-1 MUX Dataflow Modelling initial begin // Initialize Inputs a= 0;b = 0;c = 0;D0 = 1;D1 = 0;D2 = 0;D3 = 0;D4 = 0;D5 = 0;D6 = 0;D7 = 0; // Wait 100 ns for global reset to finish #100; // Add stimulus here #100; a = 0;b = 0;c = 1;d0 = ...
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VLSI: 1-4 DEMUX (Demultiplexer) Dataflow Modelling with Testbench

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Verilog Code for 1-4 DEMUX Dataflow Modelling module demux_1_to_4(     input d,     input s0,     input s1,     output y0,     output y1,     output y2,     output y3     ); assign s1n = ~ s1; assign s0n = ~ s0; assign y0 = d& s0n & s1n; assign y1 = d & s0 & s1n; assign y2 = d & s0n & s1; assign y3 = d & s0 & s1; endmodule //Testbench code for 1-4 DEMUX Dataflow Modelling initial begin                              // Initialize Inputs ...
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VLSI: 4-1 MUX Dataflow Modelling with Testbench

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Verilog Code for 4-1 MUX Dataflow Modelling module m41(out, i0, i1, i2, i3, s0, s1); output out; input i0, i1, i2, i3, s0, s1; assign y0 = (i0 & (~s0) & (~s1)); assign y1 = (i1 & (~s0) & s1); assign y2 = (i2 & s0 & (~s1)); assign y3 = (i3 & s0 & s1); assign out = (y0 | y1 | y2 | y3); endmodule //Testbench code for 4-1 MUX Dataflow Modelling initial begin                              // Initialize Inputs                              a = 1;b = 0;c = 0;d = 0;s0 = 0;s1 = 0;        ...
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VLSI: Half Subtractor and Full Subtractor Gate Level Modelling

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Half Subtractor: Verilog Module Code: module half_subtractor (      input  a,      input  b,      output  diff       output  borr ); wire x; xor (diff,a,b); not (x,a); and (borr,x,b); endmodule Full Subtractor: Verilog Module Code: module full_subtractor (      input  a,      input  b,      input  c,      output  diff       output  borr ); wire x,n2,z,n1; xor s1(x,a,b); not s3(n2,x); not s4(n1,c); and s5(y,n1,b); xor s2(diff,a,x); and s6(z,n2,a); or (borr,y,z); endmodule
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Full Subtractor Verilog Code in Structural/Gate Level Modelling with Testbench

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Verilog Code for Full Subtractor Structural/Gate Level Modelling module  full_sub(borrow,diff,a,b,c); output  borrow,diff; input  a,b,c; wire w1,w4,w5,w6; xor (diff,a,b,c); not n1(w1,a); and a1(w4,w1,b); and a2(w5,w1,c); and a3(w6,b,c); or o1(borrow,w4,w5,w6); endmodule //Testbench code for Full Subtractor Structural/Gate Level Modelling initial  begin // Initialize Inputs a = 0; b = 0; c = 0; // Wait 100 ns for global reset to finish #100; // Add stimulus here #100; a = 0;b = 0;c = 1; #100; a = 0;b = 1;c = 0; #100; a = 0;b = 1;c = 1; #100; a = 1;b = 0;c = 0; #100; a = 1;b = 0;c = 1; #100; a = 1;b = 1;c = 0; #100; a = 1;b = 1;c = 1; end Output: RTL Schematic: Full Subtractor Verilog Other Verilog Programs: Go to Index of  Verilog Programming
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