Low-noise amplifier circuit

A low-noise amplifying and amplifying circuit technology, applied in the direction of improving amplifiers to reduce noise effects, etc., can solve the problems of complex circuit design, unfavorable circuit debugging, waste of components, etc., to save component materials, reduce design complexity, and reduce costs. The effect of noise figure

Inactive Publication Date: 2015-03-25
SHANGHAI UNITED IMAGING HEALTHCARE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult for existing technology low input impedance LNAs to cover such a wide frequency band and provide low noise figure
[0006] Therefore, in reality, corresponding to multiple atomic imaging, the current met

Method used

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Embodiment Construction

[0028] In order to make the above-mentioned purpose, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be further described below in conjunction with the accompanying drawings.

[0029] figure 2 For the schematic diagram of each module of the low noise amplifier circuit of the present invention, please refer to figure 2 .

[0030] The design idea of ​​the present invention is to adopt a high input impedance broadband low noise amplifier circuit with a two-stage structure, including: an input coupling network 205 located between the coil 200 and the first amplifier element 210, connecting the front-end circuit and the rear-end first amplifier element, It is used to realize the impedance matching of the front-end and back-end circuits; the first amplifier element 210 with high input impedance is connected to the input coupling network to amplify the input signal; it is used to ensure that the static op...

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Abstract

The invention discloses a low-noise amplifier circuit. The low-noise amplifier circuit comprises an input coupling network, a first amplifier element, a first biasing unit, a second amplifier element and a second biasing unit, wherein a front-end circuit and the rear-end first amplifier element are connected by the input coupling network; the first amplifier element is connected with the input coupling network and used for amplifying an input signal; the first biasing unit is connected with the first amplifier element, and used for controlling a quiescent operating point of the first amplifier element in a linear amplifying zone; the second amplifier element is connected with the first amplifier element and used for amplifying an output signal of the first amplifier element; the second biasing unit is connected with the second amplifier element, and used for controlling a quiescent operating point of the second amplifier element in the linear amplifying zone. According to the technical scheme, a high-input impedance wideband and low-noise amplifier is adopted, the wideband amplifier realizes pre-amplifying decoupling through high-input impedance, provides a wider frequency band, provides a low noise coefficient, and supports the application of multi-nuclear magnetic resonance imaging; the design complexity is reduced, the circuit is convenient to debug, and element materials are saved.

Description

technical field [0001] The invention belongs to the field of radio frequency signal receiving integrated circuit design, and in particular relates to a low-noise amplifier circuit. Background technique [0002] In the field of medical imaging, magnetic resonance imaging is a non-invasive imaging technique that can show good soft tissue contrast. The technical principle is to superimpose the radio frequency signal under the condition of an externally strengthened magnetic field to make the nuclei in the target area resonate and send out a radio frequency signal of a certain intensity, and then the receiving coil receives the radio frequency signal, and the signal is amplified by the amplifier on the receiving link. It is transmitted to a spectrometer for subsequent further signal processing, and finally converted into an image that can be used by doctors to diagnose lesions. [0003] In existing magnetic resonance imaging (MRI) systems, the gyromagnetic ratio (that is, the p...

Claims

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Application Information

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IPC IPC(8): H03F1/26
Inventor 姚贇磊
Owner SHANGHAI UNITED IMAGING HEALTHCARE
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