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Blood oxygen detection chip with fast light intensity tracking capability

A technology of blood oxygen detection and strong tracking, which is applied in the direction of measurement circuits, biological testing, material inspection products, etc., can solve the problems of slow tracking response of light intensity changes, long cycle of pulse light response speed, etc., to achieve increased phase margin, fast The effect of response speed

Active Publication Date: 2019-05-10
重庆湃芯创智微电子有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, the main purpose of the present invention is to provide a blood oxygen detection chip with fast light intensity tracking capability, aiming to solve the problems of slow response to light intensity change tracking and long pulse light response period of traditional optical frequency sensors

Method used

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  • Blood oxygen detection chip with fast light intensity tracking capability
  • Blood oxygen detection chip with fast light intensity tracking capability
  • Blood oxygen detection chip with fast light intensity tracking capability

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Embodiment Construction

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them.

[0017] Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0018] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relationship between the components in a certain posture (as shown in the accompanying drawings). Relative positional relationship, movement conditions, etc., if the specific posture changes, the directional indication will also change accordingly.

[0019] In the p...

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Abstract

The invention discloses a blood oxygen detection chip with fast light intensity tracking capability. Illumination is received by a light current buffer to generate an output light current iph which isnot affected by the leakage current as much as possible, a band-gap reference voltage source and a linear voltage regulator are mainly used for obtaining an accurate adjustable reference voltage Vref, an integrator integrates the light current iph to obtain a voltage signal having a linear relationship with the size of the light current, a pulse generator converts the voltage signal into a frequency signal, and finally the waveform is shaped by an output buffer to obtain a final output frequency signal Freq having a linear relationship with the light intensity; meanwhile, in order to ensure that a light frequency sensor has a response speed fast enough to the change of the light intensity, an amplifier A2 in the integrator adopts a three-stage broadband differential amplifier structure under a high capacitive load condition; and the second stage uses a PMOS transistor connected with a diode to serve as a payload, and a negative zero point is introduced by a single-loop resistance-capacitance Miller compensation scheme to improve the phase margin.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to a blood oxygen detection chip with fast light intensity tracking capability. Background technique [0002] Optical frequency sensors are widely used in portable fingertip oximeters due to their low cost, so they are also called blood oxygen detection chips. detection. Traditional optical frequency sensor chips usually integrate photodiodes and shadow diodes of the same size that are blocked by metal coverings and cannot receive light to generate photocurrents that are not sensitive to leakage currents. The photocurrent produced by the diode is subtracted from the leakage current produced by the shaded diode, thus obtaining the photocurrent produced by the light only. However, this method has two major disadvantages. One is that the leakage current cancellation capability is strongly dependent on the matching between the two photodiodes, and the other is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J1/44G01N33/50
CPCA61B5/14552A61B5/7225
Inventor 唐枋
Owner 重庆湃芯创智微电子有限公司
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