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

A technology for adjusting the amplifier circuit and automatic aperture, which is applied in the direction of DC coupled DC amplifiers, differential amplifiers, etc.

Inactive Publication Date: 2011-05-25
SHENZHEN LANDWIND IND
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  • Abstract
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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

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

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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, which generates a voltage UO through 1% high-precision resistor R3 and R2 voltage division, that is, VCC*(R2 / R2+R3), and the signal is buffered by the voltage follower formed by the operational amplifier U1-1. In order to improve the impedance characteristics and load characteristics of the signal, the bias currents of the non-inverting input and the inverting input of the operational amplifier are consistent, and the common mode rejection ratio is improved. C2 is a filter capacitor, forming a low-pass filter. D1 is a p...

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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 O-VCC / (UO-VCC) or VCC / 2-VCC. Contents of the invention [0004] The ...

Claims

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Application Information

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IPC IPC(8): H03F3/45
Inventor 曾小君秦启兴
Owner SHENZHEN LANDWIND IND
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