Showing papers by "Jayanta Mukherjee published in 2019"

An Inductorless Noise Cancelling Wideband Balun LNA with Dual Shunt Feedback and Current Reuse

Abstract: An inductorless wideband low noise amplifier (LNA) with single to differential conversion is proposed for low power multiband and multi-standard radios. Conventionally common source (CS) and common gate (CG) based balun LNA suffers from high power dissipation. The proposed LNA uses dual shunt feedback to reduce the bias current of CG stage while this current is reused by CS stage. Complimentary CS stage is used to get maximum transconductance (g m ). The design is implemented in 180 nm CMOS technology and occupies an active chip area of 0.24 mm2. It achieves a maximum voltage gain of 18.5 dB, minimum noise figure of 2.8 dB, bandwidth ranging from 210 MHz to 1.1 GHz and an IIP3 of -13.4 dBm. The proposed design excluding the buffers draws a current of 3.1 mA from 1.8 V power supply.

Closely Spaced Series Fed Tapered Arrays for Base Station Massive MIMO Application

Abstract: In this paper, series fed tapered array antenna for base station massive MIMO (m-MIMO) application is proposed. A 5-element series fed array is considered as an antenna sub-array element for proposed m-MIMO antenna system. The sub-array elements are tapered uniformly with respect to center element to reduce side lobe level and mutual coupling from adjacent sub- array. Simulation for two and eight element m-MIMO design prototype is presented. A two-element m-MIMO prototype is fabricated and measured for validation. A very closely spaced (0.08λ 0 ) sub-arrays offer mutual coupling less than –20 dB, azimuth and elevation half-power beam width of 105° and 30° respectively and side lobe level less than -20 dB.

A Model for Equivalent Loss Tangent of Multilayered Media for Automotive Radar Applications

Abstract: In this paper, a mathematical equation to obtain the effective loss tangent of a multilayered medium is derived. This equation is applied to obtain the effective loss tangent of a car bumper with multiple paint layers on it. The equation is derived using two models - a parallel plate capacitor model and a transmission/reflection coefficient model. The accuracy of the equation is verified and compared using EM simulations. For the EM simulation we use two structures one where both bumper and paint materials are replaced by a single effective medium and the other where only the paint layers are replaced by a single effective medium, while the bumper is kept as it is. The EM simulations have been performed at the 77 GHz frequency band (Automotive collision avoidance radar). The simulation time for antenna gain is reduced by 88 % and 57 % for an antenna in the presence of the first and second EM structures respectively. The antenna gain obtained using the second EM structure shows a near 100 % match with that of the actual multilayered bumper and paint structure.