Talks and Poster Presentations (with Proceedings-Entry):

C. Seidl, H. Dietrich, A. Nemecek, J. Knorr, R. Swoboda, H. Zimmermann:
"New methods for bandwidth enhancement of integrated high-sensitivity optical receivers";
Talk: Conference on Photonic Materials, Devices and Applications, Sevilla, Spanien; 05-09-2005 - 05-11-2005; in: "Proceedings of Spie, Photonic Materials, Devices, and Applications", SPIE, Volume 5840 (2005), ISBN: 0-8194-5835-x; 674 - 683.

English abstract:
Optoelectronic integrated circuits (OEICs) offering high bandwidth and high sensitivity as well are needed for the pickups of optical storage systems of the next generation, such as Blu-Ray or HDDVD. High bandwidth is necessary to enable high data transfer rates between the disk and the processing device, and high sensitivity allows to operate at low optical power and to deal with the lower efficiency of the photodiodes for blue light. Two methods will be presented to increase the bandwidth of the OEIC while maintaining high sensitivity. The first approach reduces the parasitic capacitance by placing the feedback resistor in a low-doped region. By this way the parasitic capacitance of the resistor is combined in series with the small depletion-layer capacitance of the low-doped region, which results in a drastically reduced effective capacitance. Using this method the 3dB-frequency of a standard one-stage transimpedance amplifier is increased by 55% from 67MHz to 104MHz. In the second approach the feedback resistor is replaced by a network that consists of two resistive voltage dividers that are coupled via a capacitor. Using such a capacitive-coupled voltage divider (CCVD) the feedback path is split into a low- and a high-frequency path and the effective band-limiting RC-constant is reduced. A bandwidth of 378MHz could be achieved. With a measured transimpedance of 212kΩ this results in a GBW of 80.3THzΩ.

Online library catalogue of the TU Vienna:

Created from the Publication Database of the Vienna University of Technology.