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Detection circuit

A technology for detecting circuits and circuits, which is applied in the direction of measuring circuits, circuits, electrical components, etc., and can solve problems such as complex design

Inactive Publication Date: 2005-11-30
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These designs are therefore more complex and require more silicon area when fabricated in an integrated circuit

Method used

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Embodiment Construction

[0017] figure 1 Detection circuit 2 is shown. The detection photodiode 4 is arranged to detect an incident light signal, which may be, for example, a signal contained in the light output from the optical fiber. Typically, the fiber may be carrying a digital signal consisting of logical "1"s and "0s". A logical "1" may have ten times the light intensity of a logical "0". However, the light level can vary over an extremely wide range. The detection circuit may receive signals from optical fibers connected to transmitters of widely varying power. In addition, the detection circuit can be used in conjunction with long or short optical fibers, which have correspondingly different degrees of optical signal attenuation. Thus, taking the above two points together, the strength of a logical "0" can vary by several orders of magnitude.

[0018] In this example embodiment, the detection photodiode 4 is connected directly to the positive supply voltage Vcc with reverse bias, which in...

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Abstract

A photodiode detection circuit using a transimpedance amplifier circuit is disclosed. Overload current from the photodiode is diverted away from the amplifier to a voltage supply, e.g. ground, through an overload protection diode connected in series with the photodiode. A differential structure is also disclosed.

Description

technical field [0001] The present invention relates to a detection circuit, and more particularly, to a circuit that generates a voltage signal that depends on the intensity of light in an incident light signal. Background technique [0002] Detection circuits comprising photodiode detectors that generate a current proportional to the intensity of the incident light are well known. The circuit also includes a transimpedance amplifier circuit that converts the current to an output voltage. For example, US patent US-5030925 describes a detection circuit of this type. [0003] A recognized problem with detection circuits of the type described is that the input optical signal strength, and thus the photodiode current proportional to it, can vary over an extremely wide dynamic range. For example, it may be necessary to deal with input signals that vary over several orders of magnitude. If no special attention is paid to the design of the impedance at the input of the amplifie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J1/44H01L31/10
CPCG01J1/44H01L31/03529G01J2001/446G01J2001/4473
Inventor J·汤普森R·菲利皮J·班斯
Owner TELEFON AB LM ERICSSON (PUBL)