Abstract: The invention relates to an optical fiber receiver (11) for optoelectronic integrated circuits (OEIC's) having an improved sensitivity and improved bandwidth. The improvements are achieved by subdividing the photodiodes into partial photodiodes (D1, D2), whereby each partial photodiode is connected to a respective transimpedance amplifier (20, 21), and the output signals of the individual transimpedance amplifiers are added inside a summation amplifier (30). The optical fiber received can be produced using different technologies: CMOS, BICMOS, BIPOLAR.

Abstract: The invention relates to a monolithically integrated vertical pin photodiode which is produced according to BiCMOS technology and comprises a planar surface facing the light and a rear face and anode connections located across p areas on a top face of the photodiode. An i-zone of the pin photodiode is formed by combining a low doped first p-epitaxial layer, which has maximum thickness and doping concentration, placed upon a particularly high doped p substrate, with a low doped second n? epitaxial layer that borders the first layer, and n+ cathode of the pin photodiode being integrated into the second layer. The p areas delimit the second n epitaxial layer in a latent direction while another anode connecting area of the pin diode is provided on the rear face in addition to the anode connection.

Abstract: In a method of preparing from weld material a component having a curvature which is symmetrical in rotation, difficulties arise, more particularly in the case of large and heavy components, in guiding the treatment zone. The treatment zone remains in a horizontal positio for welding, on stationary welding heads. For economic form welding under numerical control, it is proposed that the rotational axis of the component be tilted stepwise, to an extent depending upon the advance of the buildup of weld material layers, around a horizontal axis perpendicular to the rotational axis, the welding heads being adjusted stepwise as the tilt position varies.