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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.

Inactive Publication Date: 2021-04-09
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the existence of end-to-end parasitic capacitance of a resistor with a large resistance value, its net impedance begins to decrease at high frequencies, and the working bandwidth of the resistor decreases
If a resistor with low parasitic characteristics is selected, such as a metal foil resistor, although the parasitic capacitance of the feedback resistor can be reduced, the price is high, and the parasitic capacitance is uncontrollable, which is not conducive to compensating the feedback loop and making the transimpedance amplifier work stably
Therefore, in actual situations, the bandwidth of TIA is often not limited by the gain-bandwidth product (GBW) of the transimpedance amplifier, but by the parasitic capacitance of the feedback resistor

Method used

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

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Embodiment Construction

[0014] The present invention provides a method for reducing the parasitic capacitance of the feedback resistor and improving the bandwidth of the transimpedance amplifier, such as figure 1 shown, including the following steps:

[0015] Step 1: In the standard photoelectric detection transimpedance circuit, apply a reverse bias voltage to the photodiode 1, the positive terminal of the photodiode 1 is connected to the reverse input terminal of the transimpedance amplifier 5, and the forward input terminal of the transimpedance amplifier 5 Grounded, the feedback resistor 2 is packaged in 1206 surface mount, the transimpedance amplifier 5 is placed on the front of the PCB, the feedback resistor 2 is placed on the back of the PCB, and the two ends of the feedback resistor 2 pass through two via holes 4 and the transimpedance amplifier 5 respectively. Connect the inverting input and output of the PCB in such a way that there are no stray traces around the feedback resistor;

[0016...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/42
CPCH03F1/42
Inventor 王少锋王旭阳李永民刘宣泽
Owner SHANXI UNIV
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