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A new detector architecture for optical pickup units in DVD systems

: Hehemann, I.; Brockherde, W.; Bußmann, A.; Hofmann, H.; Kemna, A.; Kokozinski, R.; Richter, H.; Hosticka, B.J.

	Panchanathan, S.: ISCAS 2002. Proceedings of the 2002 IEEE International Symposium on Circuits and Systems. CD-ROM Piscataway, NJ: IEEE, 2002 ISBN: 0-7803-7449-5 pp.IV/41-IV/44 : Lit.
	International Symposium on Circuits and Systems (ISCAS) <35, 2002, Phoenix/Ariz.>

	English
	Conference Paper
	Fraunhofer IMS ()
	Optikerfassungseinheit; optisches Speichersystem; Transimpedanz-Verstärker; Verstärker; Optik; CMOS

Abstract
This paper describes a new detector architecture for optical pickup units in DVD systems. Apart from data recovery it allows the detection of the spatial light intensity distribution to facilitate a new way of servo signal generation and enables crosstalk detection. The readout of the data is carried out using transimpedance amplifiers which have a calculated - 3dB bandwidth of 140 MHz at 96dB ohm dc-gain and 9.34 nAnns input noise current. Image acquisition of the laser spot is realized using the integrating photodiode method. Each pixel of a 5x5 array is read out at 500kHz and driven by an analog multiplexer. The circuitry is currently fabricated in a 0.6µm standard CMOS technology.

: http://publica.fraunhofer.de/documents/N-10674.html