70 MHz CMOS Gm-C Bandpass Filter

A CMOS Gm-C bandpass filter with a center frequency of 70 MHz and a bandwidth of 3 MHz is presented. The operational transconductance amplifier (OTA) presented in this paper along with the capacitors (Gm-C filter) is used in designing the biquad structure. The filter is realized in 0.18 i CMOS technology using Virtuoso analog environment in Cadence tool. The simulation result shows the AC response of the filter with a center frequency of 69.98 MHz, bandwidth of 3.32 MHz and a gain of 18.46 dB. Index Terms-Bandpass filter, biquad, operational transconductance amplifier (OTA), Super-heterodyne receivers.