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Super differential transimpedance amplifier structure and photodiode connection method

A technology of transimpedance amplifiers and photodiodes, applied in differential amplifiers, DC-coupled DC amplifiers, improved amplifiers to reduce noise effects, etc., can solve the problems of high noise and low sensitivity of optical receivers, and achieve suppression of even harmonics , High linearity, good linearity effect

Pending Publication Date: 2021-07-13
XI AN JIAOTONG UNIV
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Problems solved by technology

[0003] The purpose of the present invention is to provide a super differential transimpedance amplifier structure and a photodiode connection method to solve the problems of high noise and low sensitivity of optical receivers in the prior art

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  • Super differential transimpedance amplifier structure and photodiode connection method
  • Super differential transimpedance amplifier structure and photodiode connection method
  • Super differential transimpedance amplifier structure and photodiode connection method

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Embodiment approach

[0041] see figure 1 , which is a traditional single-ended input parallel feedback transimpedance amplifier structure. The photodiode is connected in such a way that the cathode is connected to the power supply, and the anode is connected to the input terminal of the TIA, so as to obtain sufficient reverse bias voltage to make the photodiode work normally.

[0042] see figure 2 , is a traditional AC-coupled differential input transimpedance amplifier structure, a capacitor is connected in series between the photodiode and the input of the transimpedance amplifier, and the signal differential input is realized by AC coupling. Both the photodiode cathode and anode are connected to the bias voltage through a large inductor. This method has the disadvantage that the low-frequency cut-off frequency is too high, which may easily cause the baseline drift of the transmission signal and affect the transmission quality of the transmission signal.

[0043] see image 3 , is a differen...

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Abstract

The invention discloses a super differential trans-impedance amplifier structure and a photodiode connection method. The structure of the super differential trans-impedance amplifier is as follows: an upper differential sub-signal channel and a lower differential sub-signal channel are stacked in a voltage domain and share a bias current; wherein the two ends of a photodiode are respectively connected to transimpedance amplifier inputs of an upper differential signal channel and a lower differential signal channel in a direct-current coupling mode, and the photodiode is biased in an anti-phase mode, so that a current signal of the photodiode is changed into differential output; and differential outputs of the photodiodes are detected through the upper and lower stacked differential sub-signal channels, and two paths of differential outputs are obtained, are subjected to level shift and are finally combined into one path of differential signal output in the output buffer. By multiplexing the output current of the photodiode, the transimpedance gain of the transimpedance amplifier is doubled, and the input reference noise is reduced. Besides, the even harmonics can be better suppressed, and better linearity is achieved.

Description

technical field [0001] The invention belongs to the technical field of optical communication chip design, and in particular relates to a super differential transimpedance amplifier structure and a photodiode connection method. Background technique [0002] In the optical fiber communication system, the task of the optical receiver is to restore the information carried by the optical carrier after optical fiber transmission with the minimum additional noise and distortion, so the output characteristics of the optical receiver comprehensively reflect the overall optical fiber communication system performance. In order to meet the requirements of increasing data traffic, the requirements for transmission rate, capacity, power consumption and sensitivity of optical receivers are getting higher and higher. In long-distance optical communication applications, coherent optical technology is generally used to improve the sensitivity performance of the receiver. As the receiver fro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/26H03F3/45
CPCH03F1/26H03F3/45
Inventor 李丹黄伟耿莉
Owner XI AN JIAOTONG UNIV
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