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Transimpedance-type electronic device, fiber-optic communication system having such device, and method of operating such device

An electronic device and transimpedance technology, applied in the field of optical fiber communication systems, can solve the problem of ineffective circuit photodiodes, and achieve the effect of low static current and high sensitivity

Active Publication Date: 2015-06-24
TEXAS INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, photodiode 2 needs to be biased according to the on-chip low-pass filter (R1, C1), and therefore, the circuit is not effective for externally biasing the photodiode

Method used

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  • Transimpedance-type electronic device, fiber-optic communication system having such device, and method of operating such device
  • Transimpedance-type electronic device, fiber-optic communication system having such device, and method of operating such device
  • Transimpedance-type electronic device, fiber-optic communication system having such device, and method of operating such device

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Embodiment Construction

[0032] Figure 5 is a simplified circuit diagram of the electronics, preferably the preamplifier stage 10, according to an embodiment of the invention. The preamplifier stage 10 includes a supply node coupled to a supply voltage line VCC. Furthermore, there is a ground terminal GND coupled to ground.

[0033] Preamplifier stage 10 may include an internal low-pass filter including resistor R1 and capacitor C1 coupled in series between supply voltage line VCC and ground. At the tap point between resistor R1 and capacitor C1 there is an output node providing a filtered supply voltage at terminal FILTER. Terminal FILTER may be coupled to photodiode 2 for biasing photodiode 2 internally. However, according to Figure 5 In an embodiment, photodiode 2 is externally biased and coupled to supply node BIAS. Figure 5 The embodiment of is suitable for both internally biased and externally biased photodiodes 2 .

[0034] Photodiode 2 receives an optical power P OPT The optical data...

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PUM

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Abstract

An electronic device, a fiber-optic communication system comprising the electronic device and a method of operating the electronic device are provided. The electronic device comprises a transimpedance-type amplifier having a transimpedance stage comprising an amplifier which is coupled in series with an input node. A feedback resistor is coupled in series between an output node of the amplifier and an inverting input node of the amplifier to provide a virtual ground node which is coupled to the input node, the inverting input node of the amplifier and to the feedback resistor. A current source is coupled to the virtual ground node so as to compensate for an offset current in an input signal which is coupled to the input node of the electronic device. Further, the electronic device comprises a control stage which is configured to control the current source as a function of a current through the feedback transistor.

Description

technical field [0001] The present invention relates to electronic devices including transimpedance amplifiers, fiber optic communication systems including photodiodes and such electronic devices, and methods of operating such devices. Background technique [0002] A transimpedance amplifier (also known as a current-to-voltage converter) converts and amplifies an input current into an output voltage. The best performance and high dynamic range of a transimpedance amplifier is achieved if the input current to the transimpedance amplifier does not include a direct current (DC) component. Transimpedance amplifiers are often used in fiber optic communication systems to sense and amplify signal current from photodiodes that detect optical data signals. The output signal / output current of the photodiode, which is more or less proportional to the illumination light power and thus more or less proportional to the optical data signal, is converted into a voltage signal for subsequen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/08
CPCH03F3/08H03F3/45475H03F3/45493H03F3/456H03F2203/45528
Inventor 格尔德·舒佩纳
Owner TEXAS INSTR INC
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