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J. Leeb, H. Zimmermann:
"Title: A 38THzΩ OEIC for DVD-Applications";
Vortrag: Proceedings of SPIE - The International Society for Optical Engineering, Strasbourg, France; 27.04.2004 - 29.04.2004; in: "Integrated Optics and Photonic Integrated Circuits", Vol. 5451 (2004), ISBN: 0-8194-5374-9; S. 16 - 23.

Since the introduction of the audio CD as the first optical storage system an increasing demand for storage media with higher data rates exists. For future DVD systems this necessitates optical pick-up units with much higher bandwidth and a high sensitivity in the red and blue spectral range. So-called OEICs (OptoElectronic Integrated Circuits) use monolithically integrated photo detectors in order to avoid additional bondpad capacitances between photodiode and amplifier and to increase the bandwidth compared to discrete or two-chip optical receivers. For this reason, OEICs are a good approach for future DVD-applications.

We introduce a solution that integrates a pin photodiode and a transimpedance amplifier in a 0.6μm BICMOS process. The bandwidth of the pin photodiode with a diameter of 50μm is larger than 1GHz. Its responsivity at 660nm (red) is 0.38A/W and 0.24A/W at 405nm (blue). The innovative transimpedance amplifier consists of two branches connected via a common current source in order to achieve differential outputs and to double the transimpedance by simultaneously minimizing the offset voltage. The amplifier is optimized for high bandwidth. Therefore, only npn transistors are used in the signal paths.

The measured results show a -3dB cut-off frequency of 500MHz and a differential transimpedance of 76kΩ. This is 2.2 times the bandwidth and 1.3 times the transimpedance compared to the results presented in [1]. Measurements also show that the OEIC is appropriate for fiber receiver applications at 1.25Gb/s with a record sensitivity of -27.7dBm.

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