Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Photoelectric signal preconditioning amplifying circuit of auto iris for digital gastrointestinal machine

A technology of conditioning amplifying circuit and automatic iris, applied in the direction of DC-coupled DC amplifier, differential amplifier, etc.

Inactive Publication Date: 2013-07-31
SHENZHEN LANDWIND IND
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Photodiodes are widely used in instrument monitoring systems. In digital gastrointestinal photoelectric detection systems, the dynamic range of the light intensity required to be detected is generally greater than 60dB or even higher. The wide dynamic range can easily cause the op amp to work in non- linear region

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Photoelectric signal preconditioning amplifying circuit of auto iris for digital gastrointestinal machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] Below according to accompanying drawing and embodiment the present invention will be described in further detail:

[0017] As shown in the figure, the circuit can be divided into two large modules: the reference source circuit and the I-V conversion circuit. The reference source circuit is mainly composed of U2, U1-1, R2, R3, and C2. The I-V conversion circuit is composed of D1, R1, C1, U1-2 composition. U2 is a high-precision voltage reference source. It generates a voltage U0 through the 1% high-precision third resistor R3 and R2, which is VCC*(R2 / R2+R3). The signal passes through the voltage follower formed by the operational amplifier U1-1. Buffering to improve the impedance characteristics and load characteristics of the signal, make the bias currents of the non-inverting input and inverting input of the operational amplifier consistent, and improve the common-mode rejection ratio. C2 is a filter capacitor, forming a low-pass filter. D1 is a photodiode. The senso...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a photoelectric signal preconditioning amplifying circuit of an auto iris for a digital gastrointestinal machine, comprising a reference source circuit and an I-V switching circuit, wherein the I-V switching circuit comprises a photodiode D1 and an I-V switching conditioning circuit; the photodiode D1 generates exciting current under the condition of visible light; the photodiode D1 is connected with the I-V switching conditioning circuit; and the I-V switching conditioning circuit is used for switching current signals into voltage signals. By using a new level lifting scheme provided by the invention, the level of a normal phase input end is lifted to dozens of millivolt, thus preferably solving the problem of insensitivity for weak signals; and meanwhile, the measuring range of an effective signal PHOTOSIGNAL is UO-VCC, thus a proper bias level UO is only selected to obtain sufficiently wide voltage output range.

Description

technical field [0001] The invention provides a photoelectric signal pre-conditioning amplifier circuit for an automatic aperture of a digital gastrointestinal machine. Background technique [0002] Photodiodes are widely used in instrument monitoring systems. In digital gastrointestinal photoelectric detection systems, the dynamic range of the light intensity required to be detected is generally greater than 60dB or even higher. The wide dynamic range can easily cause the op amp to work in non- linear region. [0003] The non-inverting input of a typical I-V signal conditioning circuit is connected to ground or VCC / 2. If it is connected to the ground, the sensitivity of the circuit to weak signals is not high, and effective signals cannot be collected normally; if it is connected to VCC / 2, for small DC signals, the range of the effective signal (signal) PHOTOSINGAL is generally reduced (half), That is 0-VCC / (UO-VCC) or VCC / 2-VCC. Contents of the invention [0004] The ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/45
Inventor 曾小君秦启兴
Owner SHENZHEN LANDWIND IND
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com