Method for reducing parasitic capacitance of feedback resistor and improving bandwidth of trans-impedance amplifier

A technology of transimpedance amplifiers and feedback resistors, which is applied in the field of high-speed transimpedance amplifiers, can solve problems such as unfavorable compensation feedback loops, high prices, and decreased working bandwidth of resistors.
CN112636702AInactive Publication Date: 2021-04-09SHANXI UNIV
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
SHANXI UNIV
Publication Date
2021-04-09
Estimated Expiration
Not applicable ยท inactive patent

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Abstract

The invention discloses a method for reducing parasitic capacitance of a feedback resistor and improving bandwidth of a trans-impedance amplifier, which shields an output field of the feedback resistor by reasonably placing a grounding shielding wire under the feedback resistor and prevents the output field from reaching a summation node end of the feedback resistor, so that the output field is effectively shunted to the ground, and the parasitic capacitance of the feedback resistor is reduced, so that the bandwidth of the TIA is improved. On the basis of the prior art, the parasitic capacitance of the feedback resistor can be further reduced, and the bandwidth of the trans-impedance amplifier is further improved.
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Description

technical field

[0001] The invention relates to the technical field of high-speed transimpedance amplifiers, in particular to a method for reducing the parasitic capacitance of a feedback resistor and improving the bandwidth of the transimpedance amplifier. Background technique

[0002] The full name of TIA is trans-impedance amplifier, which is a transimpedance amplifier. In applications that require current-to-voltage conversion, such as detecting weak photocurrent signals, a transimpedance amplifier is usually required. The photodiode converts the received light signal into a photocurrent, and the photocurrent outputs a voltage signal after passing through a transimpedance amplifier. Usually, it is necessary to select a chip resistor with a small parasitic capacitance as the feedback resistor, and reasonably optimize the PCB layout around the transimpedance amplifier to reduce the parasitic capacitance of the PCB and increase the bandwidth of the transimpedance amplifier...

Claims

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