CMOS (complementary metal-oxide semiconductor transistor) biomedical signal acquisition unit in differential capacitance network feedback structure
A technology of signal collector and differential capacitance, which is applied in the field of CMOS biomedical signal collector with feedback structure of differential capacitance network, can solve the problem of unsuitable for implantable in vivo signal detection, difficult to achieve high-precision matching, power consumption and noise Large and other problems, to achieve the effect of easy CMOS design, remove baseline noise, and improve common mode rejection ratio
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[0036] The purpose of the invention of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, and the embodiments cannot be repeated here one by one, but the implementation of the present invention is not therefore limited to the following embodiments. Unless otherwise specified, the materials and processing methods used in the present invention are conventional materials and processing methods in the technical field.
[0037] refer to figure 1 , a CMOS biomedical signal acquisition device with a differential capacitor network feedback structure, including a differential preamplifier 1, a differential variable gain amplifier 2 and a differential fourth-order switched capacitor filter 3; wherein, the forward output of the differential preamplifier 1 is connected to the differential The reverse input terminal of the variable gain amplifier 2 is connected, the negative output terminal of the differen...
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