Chopped wave amplification conditioning chip system of human body biological weak and small signals

Abstract

The invention discloses a chopped wave amplification conditioning chip system of human body biological weak and small signals. The system comprises a single-stage chopped wave core circuit, a samplingfilter circuit, a gain adjustable circuit and a low-pass filter circuit, which are connected in turn, the single-stage chopped wave core circuit is sued for performing chopped wave processing on effective biological small signals and a part of noise, so that the effective biological small signals is isolated from a frequency domain of the part of noise, the sampling filter circuit is used for eliminating a Burr voltage imported by a non-ideal switch and charge injection noise caused by opening and closing of the switch, the gain adjustable circuit is used for adjusting the gain direction of the chopped wave system in a digital manner, and the low-pass filter circuit is used for adjusting an effective broadband digit of the chopped wave system to filter the frequency of the part of noise.The chopped wave system disclosed by the invention can effectively identify and amplify the uV grade electroencephalogram EEG and mV grade electrocardiogram ECG signals.

Description

technical field [0001] The invention relates to the field of chip circuit design, in particular to a chip system for chopping, amplifying and regulating weak signals of human brain biology. Background technique [0002] At present, due to the small voltage range of weak biological signals, it is easy to be overwhelmed by environmental background noise and circuit noise. Therefore, it is urgent to design a human biological small signal amplifier conditioner with universal application value. [0003] In traditional circuits, because the equivalent input noise of the circuit is too large, it is impossible to realize universal amplification of uV / mV-level biological EEG / ECG signals, and the circuit system has increased gain, and the bandwidth cannot be digitally adjusted. Disadvantages such as large power consumption and too complicated circuit. [0004] There are few inventions that can concentrate multiple advantages on a chopper amplifier and conditioning chip system, and co...

AI Technical Summary

Problems solved by technology

However, this circuit only realizes the function of low-pass filtering, and does not have other functions such as single-chip integration, amplification and noise optimization.

[0009] To sum up, there is still no effective solution to the technical problems such as large output noise, small circuit gain and non-adjustable bandwidth generated by the amplification, filtering and conditioning process of weak and small human biological signals in the prior art.

Images