Integrated CMOS Active Low-Pass Filter for IoT RFID Transceiver

While providing unique identity to the objects, analogous to wireless sensor network (WSN) technologies, radio frequency identification (RFID) technology can be used to automate data collection and thus can significantly limit human involvements as well as errors. Therefore, utilisation and implementation of RFID technology in multifaceted applications has recently been widely observed. In the modern internet of things (IoT) radio frequency identification (RFID) transceivers, the low pass filter (LPF) circuits play an important role to suppress the unwanted high frequency signals and noises. The LPF circuit performance greatly influences the overall performance of the transceivers. However, the passive types of LPFs in modern devices highly suffer from several drawbacks such as low-quality factors, less tuning ability, unwanted harmonic interruptions and the large die size. On the contrary, active types of low pass filters can resolve these limitations to some extent. Therefore, this research presents an active LPF design for 90 nm complementary metal oxide semiconductor (CMOS) technology in Cadence environment. The simulation results reveal that the proposed active low pass filter can achieve 6.5 dB gain with 35.27 MHz bandwidth while having 20.87 dB noise figure. The designed circuit consumes 1.56mW power from a 1.3 V DC supply, for its smooth operation. The core die size of the proposed LPF is only 85.29 μm2 and therefore, suitable for compact modern transceiver applications