Low loss connecting arrangement for photodiodes

Details Low loss connecting arrangement for photodiodes Low loss connecting arrangement for photodiodes

1998-02-26

1999-11-02

Mintel, William

Active solid-state devices (e.g., transistors, solid-state diode

Heterojunction device

Light responsive structure

257434, 257448, 257458, 257459, 257461, 257758, 330260, 330271, 330293, 330299, H01L 3100

Patent

active

059775718

ABSTRACT:
Each of a plurality of photodiodes forming a photodetector is mounted on a respective metal pad on the surface of a semiconductor integrated circuit chip including a corresponding number of amplifier circuits for detecting the photocurrent from respective photodiodes. Each circuit comprises a high gain, high input impedance amplifier and a feedback element, typically a resistor of high value, connected across the amplifier between input and output nodes thereof. Each photodiode mounting metal pad and each feedback resistor is connected to a common input node of a respective amplifier by metal paths within a connecting structure forming part of the integrated circuit. Adverse effects on the output current from the photodiodes are reduced by forming a junction of the path from each feedback resistor with the path from the corresponding photodiode at the metal pad on which the photodiode is mounted, and interconnecting such junction along a common path to the corresponding amplifier input node.

REFERENCES:
patent: 4904861 (1990-02-01), Epstein et al.
patent: 5605856 (1997-02-01), Goosen et al.
patent: 5834845 (1998-11-01), Stolmeijer

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