Analysis and Development of First Order High Pass Active Filter

Filtering is very popular and important in the field of Electrical and Electronic Engineering. In the field of Telecommunication, filter is used in multiplexing whereby several different signals are transmitted through the same transmission channel and never mixed up because of virtue of their separated frequencies and are separated at the end of their receiving end again by the process of demultiplexing. In entertainment industries, audio circuits in the form of filters are used to give music distinct tones of bass, treble etc. In radio transmission, filters are used in separating transmission channels both in FM and AM bands thereby giving each station a distinctive transmission channel. In amplification devices using amplifiers, attempt in amplifying intelligent signals results in the amplification of unwanted signals in the form of noise. To minimize or reduce this, filters are used in removing the unwanted signals. Filters come in different forms but broadly it can be classified into analog and digital filters. It can also be classified by the nature of components used in its design. By this classification we have active and passive filters. In this paper, the development and characterization of a first order high pass active filter is shown..  Operational Amplifier chip OP AMP 741 was used in achieving this.  The Transfer Function (TF) equation of the filter is derived with the Band Width (BW), Cut-off Frequency (Fc) and the Quality Factor (Q) specified. The developed first order Active High Pass filter was tested by application of varied frequencies with fixed input voltage to its input while the performance monitored at the output. Finally the frequency response plots indicative of the designed specification in ratio of Vo/Vin and in dB were plotted and shown.