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Linear trans-impedance amplifier and design method and application thereof

A technology of transimpedance amplifiers and design methods, applied in the direction of amplifiers, differential amplifiers, amplifier types, etc., to achieve the effects of ensuring stability, ensuring phase margin, and improving linearity

Inactive Publication Date: 2019-09-06
XI AN JIAOTONG UNIV
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a linear transimpedance amplifier and its design method and application in view of the deficiencies in the above-mentioned prior art, which solves the higher requirements for linearity when transmitting large signals, thereby achieving excellent system performance

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  • Linear trans-impedance amplifier and design method and application thereof
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  • Linear trans-impedance amplifier and design method and application thereof

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Embodiment Construction

[0017] see figure 1 , is the gain variation method of the traditional transimpedance amplifier, and the transimpedance amplifier realizes the variation of the gain by changing the resistance value of the feedback resistor. Only reducing the feedback resistance to reduce the transimpedance gain will cause phase margin problems: this is because the feedback resistance decreases, the loop dominant pole rises, the position of the sub-dominant pole remains unchanged, and the two poles are getting closer, resulting in phase If the margin is not enough, the Q value of the closed-loop pole will increase, which will cause peaking in the closed-loop frequency response of the transimpedance amplifier, and even cause time-domain oscillations. The traditional method to solve this problem is: reduce the gain A of the built-in forward amplifier by the same multiple, so that the loop gain reduction multiple is the same as the boost multiple of the dominant pole, and the loop GBW (gain-bandwid...

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Abstract

The invention discloses a linear trans-impedance amplifier and a design method and application thereof. The trans-impedance amplifier is designed, and the trans-impedance amplifier meets the gain bandwidth requirement. For transmitting PAM-4 signals, the gain of the transimpedance amplifier is variable. In a low gain mode, changing the input end capacitance of the trans-impedance amplifier to enable the total input capacitance change multiple to be the same as the feedback resistance change multiple. The stability of adjusting the trans-impedance gain of the trans-impedance amplifier is guaranteed by adjusting the capacitance of the input end, and the high-speed optical receiving chip is applied to PAM-4 mode transmission and coherent light detection in the 50G / 200G / 400G Ethernet. According to the amplifier, the linearity of the TIA is effectively improved, and enough phase margin is ensured.

Description

technical field [0001] The invention belongs to the technical field of optical communication chip design, in particular to a linear transimpedance amplifier and its design method and application. Background technique [0002] With the deepening and popularization of applications such as 5G communication, big data, and cloud computing, the demand for data transmission bandwidth is also increasing exponentially. As a result, fiber optic networks have developed rapidly and are widely deployed in application scenarios such as various data / cloud computing centers, 5G communications, and fiber optic access. The PAM-4 (4-level Pulse Amplitude Modulation) modulation code format is currently one of the effective ways to further increase the bandwidth. Compared with the NRZ (Non Return to Zero) pattern, the PAM-4 signal can transmit twice the bit rate at the same baud rate. Although the PAM-4 signal has great advantages in the amount of data information transmission, its design also...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/32H03F1/26H03F1/56H03F3/45
CPCH03F1/26H03F1/3211H03F1/565H03F3/45179H03F2200/294H03F2203/45031H03F2203/45256
Inventor 李丹史勇俊谢洋耿莉
Owner XI AN JIAOTONG UNIV
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