CN117375536A - Video detection logarithmic amplifier - Google Patents
Video detection logarithmic amplifier Download PDFInfo
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- CN117375536A CN117375536A CN202311104608.4A CN202311104608A CN117375536A CN 117375536 A CN117375536 A CN 117375536A CN 202311104608 A CN202311104608 A CN 202311104608A CN 117375536 A CN117375536 A CN 117375536A
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- 238000001514 detection method Methods 0.000 title claims abstract description 56
- 239000003990 capacitor Substances 0.000 claims abstract description 40
- 230000015572 biosynthetic process Effects 0.000 claims abstract 8
- 238000003786 synthesis reaction Methods 0.000 claims abstract 8
- 230000000903 blocking effect Effects 0.000 claims description 12
- 230000035945 sensitivity Effects 0.000 abstract description 14
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 101100439975 Arabidopsis thaliana CLPF gene Proteins 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005672 electromagnetic field Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000002194 synthesizing effect Effects 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/26—Modifications of amplifiers to reduce influence of noise generated by amplifying elements
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/45—Differential amplifiers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/42—Balance/unbalance networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention provides a video detection logarithmic amplifier, which comprises a balun filter and a chip circuit, wherein the balun filter is used for converting a radio frequency signal into two paths of differential signals, the chip circuit comprises a first detection network, a second detection network, a synthesis network, a first resistor R0 and a first capacitor C0, the first detection network and the second detection network are respectively connected into the two paths of differential signals output by the balun filter correspondingly, the synthesis network is used for combining the output signals of the first detection network and the second detection network into one path, one end of the first resistor R0 is connected with the output end of the synthesis network, the other end of the first resistor R0 is grounded, one end of the first capacitor C0 is connected with the output end of the synthesis network, and the other end of the first capacitor C0 is grounded. According to the invention, the balun filter is added at the input end to introduce differential signals to reduce external interference, and the electrically-tunable capacitor C1 is added in the chip circuit to adjust the video working bandwidth, so that the tangential sensitivity of the video detection logarithmic amplifier is doubly improved by combining the two components.
Description
Technical Field
The invention belongs to the technical field of detection, and particularly relates to a video detection logarithmic amplifier.
Background
The video detection logarithmic amplifier is a direct detection type small receiver integrating amplification, amplitude limiting and detection, and has the characteristics of small volume, simple structure, power consumption saving, bandwidth, light weight and the like, which are increasingly focused by researchers at home and abroad, wherein the tangential sensitivity is a key index of the video detection logarithmic amplifier, and the capability of the video detection logarithmic amplifier for detecting external signals is directly determined.
At present, the existing video amplifier scheme has the following technical problems:
1, the signal is influenced by an external or internal complex electromagnetic environment, the influence of background noise is increased, and the ratio of signal power to noise power is deteriorated;
2, the tangential sensitivity index cannot be flexibly adjusted, and the detection capability of the external weak signal is limited.
Disclosure of Invention
The invention provides a video detection logarithmic amplifier, which aims to solve the technical problem that the tangent sensitivity of the video detection logarithmic amplifier cannot be effectively improved in the prior art.
The technical scheme for realizing the purpose of the invention is as follows: the utility model provides a video detection logarithmic amplifier, includes balun filter and chip circuit, the balun filter is used for converting radio frequency signal into two-way differential signal, chip circuit includes first detection network, second detection network, synthetic network, first resistance R0, first electric capacity C0, and first detection network, second detection network correspond respectively and insert the two-way differential signal of balun filter output, and synthetic network is used for synthesizing the output signal of first detection network, second detection network into one way, and one end and the output of synthetic network of first resistance R0 are connected, and the other end ground connection, the one end of first electric capacity C0 is connected with the output of synthetic network, and the other end ground connection.
Preferably, two paths of differential signal output ends of the balun filter are connected with one end of a direct-current blocking capacitor group, and the other end of the direct-current blocking capacitor group is connected with the input end of the chip circuit.
Preferably, the two differential signals output by the balun filter are 180 ° out of phase.
Preferably, one end of the first resistor R0 is used as a CLFP port of the chip circuit, the CLFP port is grounded through the electric tuning capacitor C1, and the bandwidth of the output video signal is adjusted by adjusting the capacitance value of the electric tuning capacitor C1.
Preferably, the specific formula for adjusting the bandwidth of the video signal by the electric tuning capacitor C1 is:
wherein BW is the signal bandwidth, R 0 Is the resistance value of the first resistor R0, C 0 A capacitance value of the first capacitor C0, C 1 Is the capacitance value of the electrically tunable capacitor.
Compared with the prior art, the invention has the remarkable advantages that: according to the invention, the balun filter is added at the input end to introduce differential signals to reduce external interference, and the electrically-tunable capacitor C1 is added in the chip circuit to adjust the video working bandwidth, so that the tangential sensitivity of the video detection logarithmic amplifier is doubly improved by combining the two components.
The present invention will be described in further detail with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic diagram of the operation of a video detection logarithmic amplifier of the present invention.
Fig. 2 is a schematic circuit diagram of the present invention.
Fig. 3 is a dynamic adjustment process of the present invention.
Detailed Description
Referring to fig. 1-3 together, the present embodiment provides a logarithmic video detection amplifier, which is already in practical use.
The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which illustrative embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and "comprising," when used herein, specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof.
Unless defined to the contrary, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The embodiment at least comprises the following contents: the utility model provides a video detection logarithmic amplifier, includes balun filter and chip circuit, the balun filter is used for converting radio frequency signal into two-way differential signal, chip circuit includes first detection network, second detection network, synthetic network, first resistance R0, first electric capacity C0, and first detection network, second detection network correspond respectively and insert the two-way differential signal of balun filter output, and synthetic network is used for synthesizing the output signal of first detection network, second detection network into one way, and one end and the output of synthetic network of first resistance R0 are connected, and the other end ground connection, the one end of first electric capacity C0 is connected with the output of synthetic network, and the other end ground connection.
In a further embodiment, two differential signal output ends of the balun filter are connected with one end of a dc blocking capacitor set, and the other end of the dc blocking capacitor set is connected with an input end of a chip circuit.
In a further embodiment, the two differential signals output by the balun filter are 180 ° out of phase.
The invention adopts differential port design, and the balun filter is added at the input end of the video detection logarithmic amplifier, the balun filter can perform impedance conversion with the equal ratio of 1:1, and convert radio frequency signals into two paths of differential signals which respectively enter the IN+ and IN-ports of the chip circuit shown IN the description figure 1, thereby improving the anti-interference capability of the detector.
In some embodiments, the input and output of the balun are designed into inductors with similar shapes by utilizing the compact and multi-layer structure characteristics of the silicon-based three-dimensional stacked architecture, the inductors are longitudinally inserted, the coupling quantity is greatly increased, the input impedance of the unbalanced input end of the balun is 50Ω, and the impedance of the two balanced output ends is 50Ω, so that the impedance conversion with the equal ratio of 1:1 is realized.
The working process of the invention is as follows: the radio frequency signal passes through the broadband balun, and the signal is divided into two paths: a radio frequency signal 1, the phase of which is 0 °; the radio frequency signal 2 has a phase of 180. The two paths of signals have 180-degree phase difference, namely opposite polarities, electromagnetic fields radiated outwards can be mutually offset, the more tightly coupled electromagnetic energy discharged to the outside is less, and thus the influence caused by external signal interference and internal signal crosstalk can be effectively weakened.
After the radio frequency signal 1 enters the IN+ port, the radio frequency signal 1 enters the detection network 1 immediately, and the radio frequency signal 1 is converted into a video signal 1 IN the detection network 1; the radio frequency signal 2 enters the IN-port immediately after entering the detection network 2, where the radio frequency signal 2 is converted into a video signal 2. The two paths of video signals form a composite video signal in a composite network.
In a further embodiment, the video detection logarithmic amplifier further includes an electrically tunable capacitor C1, where one end of the electrically tunable capacitor C1 is connected to one end of the first resistor R0, that is, the electrically tunable capacitor C1 is connected to the CLFP port of the chip circuit, and the other end of the electrically tunable capacitor C1 is grounded, and the output video signal bandwidth is adjusted by adjusting the capacitance value of the electrically tunable capacitor C1, and for an application requiring the maximum video bandwidth and the fast rise time, the CLPF port must remain unconnected and have no capacitance, and by connecting the electrically tunable capacitor C1 to the CLPF pin, the output video bandwidth can be adjusted, and the video signal operating bandwidth can be dynamically adjusted, so as to improve the tangential sensitivity, which is specifically: the electrically tunable capacitor C1 adjusts the bandwidth using the following formula:
where BW is the signal bandwidth, R 0 And C 0 Is parasitic equivalent parameter in the chip circuit, and 2 pi is coefficient.
Meanwhile, the dynamic adjustment process is shown in fig. 3, and specifically comprises the following steps: the singlechip is controlled by an external control signal to give out adjustable voltage, so that the capacitance value of the adjustable capacitor C1 is changed, the capacitance performance is improved, and dynamic adjustment is realized.
The balun filter can output constant-amplitude inverted signals, impedance transformation can be achieved for impedance matching, the balun filter is used for dividing power input to a single-ended port among differential ports, the divided differential ports output signals with equal power magnitude but opposite phases, namely 180-degree phase difference, the balun filter is connected, the anti-interference capability of radio frequency signals is improved, and meanwhile the sensitivity of the video detection logarithmic amplifier is improved by more than 3 dB.
After the balun sensitivity test curve is compared with the non-balun sensitivity test curve through an actual experiment, the external interference is effectively inhibited, so that the peak-to-peak value of the signal is improved from 252mV to 128mV, and the tangential sensitivity of the signal is improved from-66 dBm to-70 dBm.
Based on the above, it should also be noted that: the use of differential signaling has the following advantages over single signal line transmission:
1. the anti-interference capability is strong, when noise interference exists in the outside, the noise interference can be almost simultaneously coupled to two signal lines, and the receiving end only concerns about the difference value of the two signals, so that the common mode noise of the outside can be completely counteracted.
2. The electromagnetic interference to the outside can be effectively restrained, and the same reason is that the electromagnetic fields radiated to the outside can be mutually offset due to the opposite polarities of the two signals, so that the more tightly coupled electromagnetic energy is discharged to the outside.
Still further, the dc blocking capacitor group includes a first dc blocking capacitor and a second dc blocking capacitor connected in parallel with the first dc blocking capacitor, the first dc blocking capacitor turns on a first differential signal of the balun filter, and the second dc blocking capacitor turns on a second differential signal of the balun filter.
The inventor performs an actual tangent sensitivity test experiment according to the video detection logarithmic amplifier of the present invention, and obtains the following table:
table 1 tangent sensitivity data table
| Adjustable capacitor C1 | Video bandwidth BW | Tangential sensitivity enhancement |
| 0pF | 64MHz | / |
| 10pF | 16MHz | 6dB |
| 50pF | 4MHz | 12dB |
| 100pF | 2MHz | 15dB |
As can be known from the table, the video detection logarithmic amplifier of the invention efficiently realizes the improvement of tangential sensitivity by adding the balun filter at the input end to introduce differential signals and adding the electrically-tunable capacitor C1 in the chip circuit, and effectively solves the noise characteristic in the nonlinear device system.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (5)
1. The video detection logarithmic amplifier is characterized by comprising a balun filter and a chip circuit, wherein the balun filter is used for converting radio frequency signals into two paths of differential signals, the chip circuit comprises a first detection network, a second detection network, a synthesis network, a first resistor R0 and a first capacitor C0, the first detection network and the second detection network are respectively connected into two paths of differential signals output by the balun filter correspondingly, the synthesis network is used for combining output signals of the first detection network and the second detection network into one path, one end of the first resistor R0 is connected with the output end of the synthesis network, the other end of the first resistor R0 is grounded, one end of the first capacitor C0 is connected with the output end of the synthesis network, and the other end of the first capacitor C0 is grounded.
2. The logarithmic video detection amplifier of claim 1, wherein the two differential signal outputs of the balun filter are connected to one end of a dc blocking capacitor bank, the other end of the dc blocking capacitor bank being connected to an input of a chip circuit.
3. The logarithmic video detection amplifier of claim 1, wherein the two differential signals output by the balun filter are 180 ° out of phase.
4. The logarithmic video detection amplifier of claim 1, wherein one end of said first resistor R0 is used as a CLFP port of a chip circuit, said CLFP port being grounded via an electrically tunable capacitor C1, and the bandwidth of the output video signal is adjusted by adjusting the capacitance value of the electrically tunable capacitor C1.
5. The logarithmic video detection amplifier of claim 1, wherein the specific formula for adjusting the bandwidth of the video signal by the tunable capacitor C1 is:
wherein BW is the signal bandwidth, R 0 Is the resistance value of the first resistor R0, C 0 A capacitance value of the first capacitor C0, C 1 Is the capacitance value of the electrically tunable capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311104608.4A CN117375536A (en) | 2023-08-30 | 2023-08-30 | Video detection logarithmic amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311104608.4A CN117375536A (en) | 2023-08-30 | 2023-08-30 | Video detection logarithmic amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117375536A true CN117375536A (en) | 2024-01-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311104608.4A Pending CN117375536A (en) | 2023-08-30 | 2023-08-30 | Video detection logarithmic amplifier |
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| Country | Link |
|---|---|
| CN (1) | CN117375536A (en) |
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2023
- 2023-08-30 CN CN202311104608.4A patent/CN117375536A/en active Pending
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