Prof. Dr. Ing. habil Ajay K. Poddar of Oradea University, Romania

Highly stable oscillators have been an important component of coherent detection systems. Oscillator phase noise reduction can be achieved by forcing free-running oscillator using injection locking (IL) and phase locked loop (PLL). While IL technique are easy to implement, the phase noise in the close-in offset frequencies is degraded due to frequency detuning and limited locking range.. On the other hand, the high gain loop filter enables the PLL to remove the close-in phase noise significantly, while far away offsets suffers from a higher noise. In an externally forced oscillators, a better phase noise characteristics for both close-in and far-away offset frequencies and a wider locking range can be achieved by combining IL and PLL (ILPLL). However, external reference sources are required in the conventional ILPLL topology, which limits the ultimate phase noise performance. To bypass limitations imposed by an extremely stable external reference requirement, self-injection locking (SIL) and self-phase locked loop (SPLL) have been proposed. SIL and SPLL are essentially feedback control loops where part of the output signal is delayed and used as reference signal, thus eliminating the need for an external reference. 

Biography:

Dr. Ajay K. Poddar graduated from IIT Delhi, and did Doctorate (Dr.-Ing.) from Technical University Berlin, Germany, Post Doctorate (Dr.-Ing. habil) from Brandenburg Institute of Technology, Cottbus, Germany.

Dr. Poddar is a professor at Oradea University, Romania.

Dr. Poddar received several awards for his scientific achievements, holds several dozen patents and published over 300 scientific papers in international conferences, and professional journals, contributed as an author/coauthor of 6-technical books.

Dr. Poddar is serving as Academic advisory board member of Don Bosco Institute of Engineering, Bombay, India; Fellow member of IEEE professional society.  

Email:

Address:University of Oradea, , Oradea, Romania