RECONFIGURABLE AND WIDEBAND SAW RESONATOR-BASED FILTERS & CMOS BANDPASS FILTERS FOR WIRELESS COMMUNICATION SYSTEM

Ph.DDOCTOR OF PHILOSOPH

HIGH PERFORMANCE CMOS WIDE-BAND RF FRONT-END WITH SUBTHRESHOLD OUT OF BAND SENSING

In future, the radar/satellite wireless communication devices must support multiple standards and should be designed in the form of system-on-chip (SoC) so that a significant reduction happen on cost, area, pins, and power etc. However, in such device, the design of a fully on-chip CMOS wideband receiver front-end that can process several radar/satellite signal simultaneously becomes a multifold complex problem. Further, the inherent high-power out-of-band (OB) blockers in radio spectrum will make the receiver more non-linear, even sometimes saturate the receiver. Therefore, the proper blocker rejection techniques need to be incorporated. The primary focus of this research work is the development of a CMOS high-performance low noise wideband receiver architecture with a subthreshold out of band sensing receiver. Further, the various reconfigurable mixer architectures are proposed for performance adaptability of a wideband receiver for incoming standards. Firstly, a high-performance low- noise bandwidthenhanced fully differential receiver is proposed. The receiver composed of a composite transistor pair noise canceled low noise amplifier (LNA), multi-gate-transistor (MGTR) trans-conductor amplifier, and passive switching quad followed by Tow Thomas bi-quad second order filter based tarns-impedance amplifier. An inductive degenerative technique with low-VT CMOS architecture in LNA helps to improve the bandwidth and noise figure of the receiver. The full receiver system is designed in UMC 65nm CMOS technology and measured. The packaged LNA provides a power gain 12dB (including buffer) with a 3dB bandwidth of 0.3G – 3G, noise figure of 1.8 dB having a power consumption of 18.75mW with an active area of 1.2mm*1mm. The measured receiver shows 37dB gain at 5MHz IF frequency with 1.85dB noise figure and IIP3 of +6dBm, occupies 2mm*1.2mm area with 44.5mW of power consumption. Secondly, a 3GHz-5GHz auxiliary subthreshold receiver is proposed to estimate the out of blocker power. As a redundant block in the system, the cost and power minimization of the auxiliary receiver are achieved via subthreshold circuit design techniques and implementing the design in higher technology node (180nm CMOS). The packaged auxiliary receiver gives a voltage gain of 20dB gain, the noise figure of 8.9dB noise figure, IIP3 of -10dBm and 2G-5GHz bandwidth with 3.02mW power consumption. As per the knowledge, the measured results of proposed main-high-performancereceiver and auxiliary-subthreshold-receiver are best in state of art design. Finally, the various viii reconfigurable mixers architectures are proposed to reconfigure the main-receiver performance according to the requirement of the selected communication standard. The down conversion mixers configurability are in the form of active/passive and Input (RF) and output (IF) bandwidth reconfigurability. All designs are simulated in 65nm CMOS technology. To validate the concept, the active/ passive reconfigurable mixer configuration is fabricated and measured. Measured result shows a conversion gain of 29.2 dB and 25.5 dB, noise figure of 7.7 dB and 10.2 dB, IIP3 of -11.9 dBm and 6.5 dBm in active and passive mode respectively. It consumes a power 9.24mW and 9.36mW in passive and active case with a bandwidth of 1 to 5.5 GHz and 0.5 to 5.1 GHz for active/passive case respectively

Recent Progress in the Design of 4G/5G Reconfigurable Filters

YesCurrently, several microwave filter designs contend for use in wireless communications. Among various microstrip filter designs, the reconfigurable planar filter presents more advantages and better prospects for communication applications, being compact in size, light-weight and cost-effective. Tuneable microwave filters can reduce the number of switches between electronic components. This paper presents a review of recent reconfigurable microwave filter designs, specifically on current advances in tuneable filters that involve high-quality factor resonator filters to control frequency, bandwidth and selectivity. The most important materials required for this field are also highlighted and surveyed. In addition, the main references for several types of tuneable microstrip filters are reported, especially related to new design technologies. Topics surveyed include microwave and millimetre wave designs for 4G and 5G applications, which use varactors and MEMSs technologies.This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement H2020-MSCA-ITN-2016 SECRET-722424