Multilevel unity feedback amplifying circuit of full-automatic three-classification blood cell analyzer

Abstract

The invention discloses a multi-level full-feedback amplifying circuit of a full-automatic trichotomized group blood corpuscle analyzer, which comprises a signal input circuit, an amplifying circuit that comprises operational amplifying circuits in three levels, a comparison control circuit and an integral feedback circuit, the signal input circuit obtains a micro signal from a sensor, outputs the signal to a first-level operational amplifying circuit and sends the amplified signal into a second-level operational amplifying circuit, one path of an amplified hematids RBC signal is output by a voltage division circuit and another path runs through a third-level operational amplifying circuit, and one path of an amplified blood platelet signal PLT is output by the voltage division circuit and simultaneously input into the comparison control circuit that generates a control signal to control the integral time of the integral feedback circuit, and another path is fed back to a first-level operational amplifier input part of the third-level operational amplifying circuit by the integral feedback circuit, thus forming the three-level full-feedback amplifying circuit. The three-level full-feedback amplifying circuit adequately utilizes the amplifying times of the amplifying circuit and simultaneously reduces noise interference.

Description

Technical field [0001] The invention belongs to a multi-stage full-feedback amplifying circuit of medical equipment, and relates to a driving circuit board of a full-automatic three-group blood cell analyzer. Background technique [0002] The counting principle of blood cells is based on the impedance change produced when blood cells pass through the gemstone microsensor. When the blood cells mixed with the diluent pass through the gem micropore, the resistance around the small hole changes, and a very small voltage pulse signal proportional to the cell size is formed on the two electrodes placed on both sides of the micropore. Then, through the processing of the instrument amplification circuit, the voltage signal is amplified and the background noise is removed to obtain a signal that can be analyzed. Finally, the amplified signal is sampled by A / D to the main board for processing. During the whole process, since the voltage formed by the blood cells passing through the t...

AI Technical Summary

Problems solved by technology

The general AC amplifier is only based on positive and negative equal-amplitude amplification of the 0 line. Since the automatic three-group blood cell analyzer amplifies very small signals at a high multiple, and if the amplification factor is too high, it will introduce strong interference. Therefore, based on The positive and negative equal-amplitude magnified AC amplifiers of the 0-line cannot make full use of their magnification, so the general AC amplifiers are not suitable for the amplification of tiny signals of the automatic three-group blood cell analyzer

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