High-sensitivity current amplification circuit and chip thereof

Abstract

The invention provides a high-sensitivity current amplification circuit and a chip thereof. The high-sensitivity current amplification circuit comprises a current amplification module, a high-low level output module and a voltage conversion unit; the current amplification module is used for amplifying the circuit current through a current replication circuit consisting of two groups of PMOS (positive Metal Oxide Semiconductor) tubes, and comprises an upper-stage PMOS tube group and a lower-stage PMOS tube group; the high-low level output module is a high-low level trigger composed of a PMOS transistor and an NMOS transistor; according to the current amplification circuit and the chip thereof, rapid current amplification can be achieved, two circuit modes of digital electricity and analog electricity are compatible, the working range of the amplification circuit is wide, and the amplification factor is controllable.

Description

technical field [0001] The invention relates to the field of current amplification, in particular to a high-sensitivity current amplification circuit and a chip thereof. Background technique [0002] The photodetector captures the radiant energy of light through the photoelectric effect, outputs a weak current signal, and realizes the conversion from optical signal to electrical signal. In the field of weak signal measurement such as photocurrent, the process of measuring weak signals is extremely susceptible to interference from environmental factors, and in severe cases, weak signals may even be submerged in background noise. In the measurement of this kind of weak signal, a tiny defect in a certain link will seriously deteriorate the measurement accuracy. Since the current signal output by the detector is very weak, the signal must be amplified and then transmitted. Due to the influence of background noise, circuit noise, and component noise, it is difficult to output an...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the disadvantages of slow conversion speed and low sensitivity of the existing current amplification circuit, the present invention provides a current that can be rapidly amplified, and is compatible with both digital and analog circuit modes. The working range of the amplifying circuit is wide and the magnification factor is controllable. The current amplifier circuit and its chip

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