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

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