High-speed CMOS monolithic integration light receiver front end of cross coupling structure

Abstract

The invention discloses a high-speed CMOS monolithic integration light receiver front end of a cross coupling structure. The high-speed CMOS monolithic integration light receiver front end comprises a photoelectric detector of a completely-symmetric structure, a trans-impedance amplifier of a difference structure, a direct current excursion eliminating unit, a three-stage sequence cascaded difference limiting amplifier and an output buffer stage; the trans-impedance amplifier of the difference structure is used for converting current signals output by the photoelectric detector into voltage signals and conducting preliminary amplification; the direct current excursion eliminating unit is used for eliminating direct current excursion led in by non-balanced signals at the input end of the trans-impedance amplifier and enables common mode levels at the output end of the trans-impedance amplifier to be coincident; the three-stage sequence cascaded difference limiting amplifier is used for amplifying the voltage signals output by the trans-impedance amplifier to be at the voltage level needed by a digital processing unit. Through the adoption of the cross coupling structure, the noise in-phase counteraction technology and the parallel type active inductor design, a high-speed and high-sensitivity standard CMOS monolithic integration light receiver can be achieved.

Description

technical field [0001] The invention relates to the field of optical fiber communication system and optical interconnection, in particular to a high-speed CMOS single-chip integrated optical receiver front-end circuit with a cross-coupling structure. Background technique [0002] With the continuous development of communication and multimedia technology, people's demand for data information continues to increase. Because optical fiber communication has the advantages of high speed and large capacity, it is widely used in trunk network. However, for user terminals, limited by the cost of optoelectronic integrated chips, it is difficult to continue to advance the "last mile" of fiber-to-the-home. Therefore, the development of low-cost, high-performance optoelectronic integrated chips has become a research hotspot in the field of integrated optoelectronics. [0003] A fiber optic communication system usually consists of three parts: an optical transmitter, an optical fiber ch...

AI Technical Summary

Problems solved by technology

The way to reduce the input impedance is usually achieved by adjusting the transistor size of the input point or introducing a feedback structure, but this is at the expense of circuit noise performance

Low noise front-end circuits are often implemented with high input impedance, which obviously also sacrifices bandwidth

In addition, there are examples of adopting noise canceling structures or introducing equalizers, but these measures still cannot solve the trade-off between bandwidth and noise well

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