A novel CMOS G $$_{m}$$ m -C complex filter design for multi-mode multi band wireless receiver applications

Abstract

This paper presents a new approach of $$G_m$$GmC complex filter for multi standard wireless receiver applications. In order to get high IRR with low power consumption a novel architecture of $$G_m$$GmC complex filter has been proposed with the combination of first order left shifting and right shifting notch filters. The filter is designed in 180 nm CMOS technology and it has a power consumption of 580 μW from 1.8 V supply voltage. This novel approach can be used for multiband multi standard wireless receiver applications, because this filter can be tuned to operate in different frequency bands with different centre frequencies like bluetooth, UMTS, WLAN, GPS etc. In this paper the complex filter for bluetooth applications with a bandwidth of 2 MHz has designed and results are compared with the previous filter topology. The proposed filter achieves around 51 dB image rejection ratio at the center frequency of 4 MHz with using just a third order filter. The power consumed by the proposed filter is 52$$\,\%$$% less than the existing topology.