Ultralow noise analogue amplifier for three-dimensional resistivity acquisition system
An ultra-low noise, data acquisition system technology, applied in the field of geophysical exploration, can solve problems such as areas with high forests and dense rivers and ditches, and possibly sparsely populated desert areas, reduced working efficiency of transmitter equipment, and inability to carry out work. Effects of weight reduction, improved input impedance, and high common mode rejection ratio
An ultra-low noise, data acquisition system technology, applied in the field of geophysical exploration, can solve problems such as areas with high forests and dense rivers and ditches, and possibly sparsely populated desert areas, reduced working efficiency of transmitter equipment, and inability to carry out work. Effects of weight reduction, improved input impedance, and high common mode rejection ratio
CN103457545AInactive Publication Date: 2013-12-18EAST CHINA UNIV OF TECH
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[0010] An ultra-low noise analog amplifier for a three-dimensional resistivity data acquisition system, comprising two parts, the first part is a directly coupled voltage series negative feedback ultra-low noise amplifier composed of six transistors, and the second part is composed of three operational amplifiers Low noise amplifier; the first part of the ultra-low noise amplifier, the first stage consists of four transistors T1 ~ T4, the four transistors are connected in parallel, the collectors of the four transistors are connected together, and connected in series with the resistor R1 Then connect the power supply VEE1, the emitters of the four transistors are connected together, then connected in series with the resistor R6 and then grounded, the bases of the four transistors are connected together, and then connected with R4 and C3, and the four transistors T1 to T4 are performance parameters. The same transistor; the second stage consists of transistor T5, resistors R3 an...
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The invention relates to an ultralow noise analogue amplifier for a three-dimensional resistivity acquisition system, which comprises two parts. The first part is a directly coupled voltage series negative feedback ultralow noise amplifier consisting of six transistors; the second part is a low noise amplifier consisting of three operational amplifiers; in the first part, an emitting electrode on the second stage provides bias currents for base electrodes on the first stage; when the bias currents are obtained, DC (Direct Current) negative feedback is introduced, so that a static working point of a circuit is more stable; a capacitor is added into a bias feedback circuit, so that an input impedance of an amplification circuit is greatly improved; the second part is formed by two in-phase input universal integrated operational amplifiers of which the performance parameters are highly consistent, adopts double-end signal input and single-end signal output, has a very high common mode rejection ratio and a very good effect on interference suppression on an electromagnetic field and can enable the measurement accuracy to reach below 0.1muV, so that weights of field transmitting equipment and receiving equipment can be greatly reduced and working efficiency of electrical prospecting is greatly improved.
Description
technical field [0001] The invention belongs to the technical field of geophysical exploration, and relates to an ultra-low noise analog amplifier used in a three-dimensional resistivity data acquisition system in the technical field of resource and environmental exploration. Background technique [0002] The three-dimensional resistivity data acquisition system belongs to the direct current method exploration instrument. The development of direct current prospecting instrument technology is inseparable from the development of electric prospecting theory, electronic technology, signal processing technology and computer technology. Direct current prospecting instruments have gone through a development process similar to other instruments, from mechanical to electronic tube and transistor stage, to integrated circuit and microcomputer control stage. [0003] With the gradual development of mineral resource exploration to the deep, the required exploration depth is getting lar...
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Patent Timeline
18 Dec 2013
Publication
CN103457545A
- IPC
- H03F1/26
- Inventors
- 刘庆成; 邓居智