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Transimpedance Amplifier for Detecting Signal from PIN Diode Coupled to Light Transmitting Fiber

IP.com Disclosure Number: IPCOM000044713D
Original Publication Date: 1984-Apr-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Boerstler, D: AUTHOR

Abstract

A PIN diode is arranged to detect light from a fiber, and its electrical signal is transmitted to a transimpedance amplifier. The output of the transimpedance amplifier is applied to the non-inverting input of a first differential amplifier which produces true and complement outputs. These outputs are amplified for use in other components. The true and complement outputs are also applied to components that control the operation of the first differential amplifier. Two positive peak detector circuits are connected to the two outputs and their outputs are applied to a second differential amplifier. The output of the second differential amplifier varies with any unbalance in the two outputs with respect to ground, and is filtered and applied to the inverting input of the first differential amplifier.

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Transimpedance Amplifier for Detecting Signal from PIN Diode Coupled to Light Transmitting Fiber

A PIN diode is arranged to detect light from a fiber, and its electrical signal is transmitted to a transimpedance amplifier. The output of the transimpedance amplifier is applied to the non-inverting input of a first differential amplifier which produces true and complement outputs. These outputs are amplified for use in other components. The true and complement outputs are also applied to components that control the operation of the first differential amplifier. Two positive peak detector circuits are connected to the two outputs and their outputs are applied to a second differential amplifier. The output of the second differential amplifier varies with any unbalance in the two outputs with respect to ground, and is filtered and applied to the inverting input of the first differential amplifier. A negative peak detector and a positive peak detector are connected to the same output of the first differential amplifier and their outputs are connected to a third differential amplifier. The output of the third differential amplifier varies with the amplitude of the signal of the first differential amplifier, and it is applied to an input of the first differential amplifier to control its gain.

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