High-pass filter model

This article contains Verilog-A model for a high-pass filter.

Usage:

1. Create a new cell in Library Manager named HPF and select cell type Verilog A;
2. Copy and paste the code provided;
3. Specify Cutoff_frequency variable to be -3dB frequency;
4. Perform Check and Save;
5. A cell symbol will be created;
6. Instantiate HPF cell into your design;
7. Perform Check and Save and run the simulation.

HPF model testbench

HPF model simulation result

Cell name: HPF

Model type: Verilog-A

1    
2// Low Pass filter model based on -3dB frequency definition
3// Author: A. Sidun
4// Source: AnalogHub.ie
5
6`include "constants.vams"
7`include "disciplines.vams"
8
9module HPF(in, out);
10electrical in, out;
11parameter real Cutoff_frequency = 10k;      // -3dB frequency
12parameter real Filter_Order = 1;            // 1 for 20dB/dec, 2 for 40dB/dec
13
14analog begin
15 V(out) <+ laplace_nd(V(in),{0, 1},{2*`M_PI*Cutoff_frequency, 1});
16    end
17endcase
18end
19endmodule