Active feedback common-emitter common-base trans-impedance amplifier based on SiGe BiCMOS

Abstract

The invention relates to an active feedback common-emitter common-base trans-impedance amplifier based on SiGe BiCMOS. The active feedback common-emitter common-base trans-impedance amplifier comprises a current source and a capacitor, an auxiliary amplifier and a main amplifier, wherein the main amplifier adopts a common-emitter common-base structure; the current source and the capacitor are in parallel connection to provide the output of the light current, the output end is connected with a base of a common-emitter tube of the main amplifier, and the other end is grounded; the auxiliary amplifier adopts the co-emitter amplifier structure with the load, and the input end thereof is connected with the collector of the co-emitter tube of the main amplifier and the co-emitter of the common-base tube; the signal flows into a branch located by the auxiliary amplifier, the signal reflows to the base of the common-base tube of the main amplifier to form the active feedback after being further amplified by the common-emitter tube of the auxiliary amplifier, thereby improving the voltage between the emitter and the base of the common-base tube of the main amplifier.

Description

technical field [0001] The invention belongs to optical communication, optical interconnection and visible light communication systems, and relates to a transimpedance amplifier compatible with silicon germanium bipolar-complementary metal oxide semiconductor (SiGe BiCMOS) technology and adopting active feedback cascode technology. Background technique [0002] With the rise of big data carriers such as the Internet of Things, cloud computing, and mobile Internet, the amount of information transmission has increased in an avalanche, and the rapid growth of data rates has driven traditional electrical connections to their performance limits. In terms of increased bandwidth, reduced electromagnetic interference and reduced channel loss, optical interconnection has excellent performance. Optical interconnection uses photons as information carriers, which has more significant advantages than traditional electrical interconnection. For example, large transmission capacity, high ...

AI Technical Summary

Problems solved by technology

Although common-base amplifiers and RGC amplifiers have lower input impedance, which can effectively isolate large input capacitance and thus expand bandwidth, their noise performance is poor compared to common-emitter technology

In addition, inductance peaking technology is also a commonly used method to increase bandwidth and reduce noise, but the introduction of spiral inductors significantly increases the overall area of ​​the layout, thus greatly increasing the manufacturing cost, so it is not suitable for the preparation of low-cost optical receivers

In addition, inductance also increases substrate coupling, introducing higher crosstalk

Parallel feedback (FB) transimpedance amplifier is one of the commonly used topologies to achieve high bandwidth and high sensitivity, however bandwidth enhancement results in a trade-off between transimpedance gain and power consumption

Optimizing the parameter values ​​of the feedback resistors and input transistors is usually used to maximize the transconductance and thereby minimize the noise, but this is at the expense of bandwidth and power consumption

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