Journal article Open Access

CFOA based Biquad filter realized with low pass filter and band pass filter using dual op-amp IC (THS3202) for high frequency applications

Vijay Laxmi Kalyani; Prachi Mathur; Nidhi Singhal; Nupur Makwana

In this paper biquad filter has been proposed to  design  the  band  pass  and  low  pass  filter  for  high frequency  and  low  frequency  applications with  a  very high speed dual current-feedback operational amplifier IC THS3202D which has high slew rate of 9000 V/µs with low distortion. The proposed circuit has been designed at 17.8 MHz  frequency  range.  The  output  results  of  low pass filter are obtained at 17.1MHz which is the nearest value of  theoretical  frequency 17.8MHz with a sharper transition region. The output of low pass filter passes all the frequencies from 20.756 KHz to 17.1MHz and it stop the  other  frequencies  above  17.1MHz.  The  band  pass filter  output  obtained  at  center  frequency  1.023GHz which select the frequencies between two band fH and fL from  1.179  GHz  to  874.094  MHz  and  reject  the frequencies outside these bands. The proposed circuit is best  suited  for many  applications  such  as  High-Speed Signal  Processing,  Test  and  Measurement  Systems, High-Voltage ADC Preamplifier, RF  and  IF Amplifier Stages, Professional Video etc. In  this paper  the output results are obtained by help of  simulation software NI-MULTISIM and ULTIBOARD.

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