“Design of Charge Recycling ternary RF DAC based transmitter for software defined Radios”, Core Research Grant (CRG), Science and Engineering Board (SERB)

This project is aimed at developing a digitally intensive Radio Frequency Digital to Analog Converter (RF-DAC) based transmitter .The proposed RF DAC is a ternary DAC unlike conventional binary DACs which will recycle excess charge back to the supply. As the spectral purity and bandwidth available for each channel is limited by the performance of the DAC, various methods like calibration and noise-shaping have been proposed thus far.

“Design of Wide band PLL”, Sponsored by Mixed Signal Devices Inc, Irvine CA

This project is aimed at designing a wide band fractional N PLL with a novel charge pump architecture. Preliminary results show the mismatch of 0.01% current mismatch in charge pump.

“Design of high speed high resolution DACs”, IIT Delhi New faculty startup seed grant

The demand for high quality and high speed data rata in communication systems keeps increasing. Complex digital signal processing is made feasible by technology scaling. However, the spectral purity and speed is limited by Digital to Analog (DAC) Converters. The digital assisted analog approach is taken by several researchers in literature to solve this issue. However, these attempts are often limited with resolution of calibrating circuit or increase in noise floor. This project is aimed at increasing the resolution and speed of these DACs by using various digital algorithms and segmentation techniques.

“Compact, high efficiency transmitters with power efficient Power Amplifiers for Satellite-Borne Communication Systems”, FIRP in collaboration with Prof Kirti Dhwaj, CARE IITD

This project is aimed to develop an RF Transmitter with high speed DAC that can deliver data with high carrier frequency. Gain programmability will be incorporated in the transmitter to compensate for the Power amplifier gain variation.

“Electronic sub-system design for RADARs and LASERs" as I-Hub Foundation for COBOTICS”

This project is aimed to build a transceiver for Radar application. This can be used in drone system in relation to cobotics and for proximity sensor and localization. The transmitter will be built in a custom design integrated circuit to realize compact RADAR.

“Mid-air Haptic Interface”,(collaboration with CEERI Pilani, IIT J)

Modern technology has pushed the envelope of push button technology. The technology has evolved from mechanical to electronic grade push button/switch grade. Mechanical switches are based on a spring and contact plate. The spring disconnects the connection by pushing connecting plate upward. Whenever a user applies mechanical force on the button, the plate comes in contact with bottom plate to complete connection. Mechanical contacts have high failure rate, due to degradation of spring stiffness, carbon development at contacts, susceptible to dust makes them less popular. Apart from that, physical contact between human and button is inevitable. To remove such problems, touch based switch platform were developed based on peizo-resistive and capacitive sensors. Among them capacitive touch has gained wider acceptance in modern electronic gadgets i.e smart phone, display panels, TV, refrigerator, vending machines, smart lock based doors etc.. Advent of Corona like pandemics have forced customers to move away from contact based switch. Such situations make essential services like ATM from banks, hospital, transport industry not user friendly (especially in post-corona pandemic scenario). A range of solutions are reported in literature to achieve non-contract based switch operation using optical sensor, ultrasonic sensors, and laser based TxRx. Each approach has its merits and de-merits. Among the above mentioned techniques, ultrasonic sensing technique is more promising. The proposed non-contact based switch button i.e mid-air haptic interface will be used for above mentioned applications. Our team will be involved in the design of sensor interface circuitry and a high resolution ADC.