Far infrared spectrum detection low-noise pre-amplification circuit
A technology of preamplifier circuit and detection circuit, which is applied in the field of signal detection and can solve the problem of high noise level
Active Publication Date: 2018-11-13
INST OF PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology
The noise level of existing low-noise preamplifier circuits is relatively high, which is not suitable for far-infrared spectral detection
Method used
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[0060] figure 1 It is a circuit diagram of a low-noise preamplifier circuit according to an embodiment of the present invention. Such as figure 1 As shown, a low-noise preamplifier circuit for far-infrared spectrum detection of the present invention includes a low-temperature detection circuit, a power supply circuit, a secondary amplification circuit and multiple filter circuits. The power supply circuit is used for converting and outputting DC voltages of different voltage values, including a first power supply circuit and a second power supply circuit. The secondary amplifier circuit is used to receive the signal collected by the low temperature detection circuit for differential amplification processing, including a differential amplifier and a bias circuit. The differential amplifier includes a first operational amplifier and a second operational amplifier, and the first operational amplifier and the second operational amplifier are connected in parallel. A plurality o...
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The invention provides a far infrared spectrum detection low-noise pre-amplification circuit and relates to the technical field of signal detection. The far infrared spectrum detection low-noise pre-amplification circuit comprises a low-temperature detecting circuit, power circuits, a secondary amplification circuit and a plurality of filter circuits, wherein the power circuits are used for converting and outputting different direct current voltages and composed of a first power circuit and a second power circuit; the secondary amplification circuit is used for receiving signals collected by the low-temperature detecting circuit for differential amplification and is composed of a differential amplifier and a bias circuit, and the differential amplifier is composed of a first operational amplifier and a second operation amplifier; the plurality of filter circuits are used for eliminating noise of the power circuit and the secondary amplification circuit; the first power circuit suppliesa normal working direct current voltage for the secondary amplification circuit, and the second power circuit supplies a normal working direct current voltage for the low-temperature detecting circuit. The far infrared spectrum detection low-noise pre-amplification circuit can greatly reduce signal noise.
Description
technical field [0001] The invention relates to the technical field of signal detection, in particular to a low-noise preamplifier circuit for far-infrared spectrum detection. Background technique [0002] In the measurement process of the far-infrared light transmission spectrum of the detection material, the light signal passing through the material is very small, and it will be affected by external noise during the process of the signal from the low temperature detection device to the external signal collection and processing device. Therefore, after the optical signal is output from the low temperature detection device, an amplification circuit is needed to amplify the optical signal, thereby reducing the influence of external noise. At the same time, it is required that the noise of the amplifier circuit itself should not be too large. The noise level of the existing low-noise preamplifier circuit is relatively high, which is not suitable for far-infrared spectrum dete...
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Patent Timeline
Login to View More IPC IPC(8): G01N21/01H03F3/45H03F1/26
CPCG01N21/01G01N21/3581G01N2201/123H03F1/26H03F3/45376
Inventor 黄祥威杨昌黎刘广同
Owner INST OF PHYSICS - CHINESE ACAD OF SCI