CN111770296B - Flatness leveling method for cable television optical receiver - Google Patents
Flatness leveling method for cable television optical receiver Download PDFInfo
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- CN111770296B CN111770296B CN202010563835.3A CN202010563835A CN111770296B CN 111770296 B CN111770296 B CN 111770296B CN 202010563835 A CN202010563835 A CN 202010563835A CN 111770296 B CN111770296 B CN 111770296B
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- link
- flatness
- additionally arranged
- reactance
- capacitance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/10—Adaptations for transmission by electrical cable
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/22—Adaptations for optical transmission
Abstract
The invention discloses a flatness leveling method for a cable television optical receiver, which comprises the following steps: step S1: when a link is designed, at least one protection device and a coupling device which is corresponding to the protection device and is used for balancing capacitive reactance and inductive reactance are additionally arranged; step S2: when the link is wired, at least one grounding capacitor is reserved to offset inductive reactance exceeding a threshold value generated by overlong wired link; step S3: when the link is debugged, the capacitive reactance and the inductive reactance of the whole link are adaptively adjusted by a preset manual touch debugging method, so that the flatness of the whole link is optimized. The invention discloses a flatness leveling method for a cable television optical receiver, which aims to overcome the defect of poor flatness and realize the integral leveling of a link.
Description
Technical Field
The invention belongs to the technical field of optical receiver debugging, and particularly relates to a flatness leveling method for a cable television optical receiver.
Background
The utility model discloses a CN202334776U, the subject matter is to have anti-match video light receiver of anti-match based on ground digital television single frequency network's utility model patent, its technical scheme discloses "including photoelectric converter (1), photoelectric converter (1) converts the light signal into the electric signal, inputs the electric signal to impedance amplifier (2) and enlargies again, impedance amplifier (2) also carry out the electricity with impedance converter (3) and are connected, the electric signal through impedance amplifier (2) amplification back, input to impedance converter (3) and carry out impedance transformation to generate the electric signal that impedance is 75 ohm, and photoelectric conversion module (1) and impedance amplifier (2) between still be connected with blocking current condenser (5), the output of photoelectric conversion module (1) still is connected with ground resistance (6), video light receiver still include automatic gain control circuit (7), the input end of the automatic gain control circuit (7) is connected with the input end of the impedance amplifier (2), and the output end of the automatic gain control circuit (7) is connected with the input end of the impedance converter (3) after being connected with a delay circuit (8).
However, in the above-mentioned utility model patent, although the general concept of "optical receiver with impedance matching" is disclosed, the "flatness" requirement and how to "level" the specific implementation are not further extended. In other words, the technical solution disclosed in the above utility model is difficult to be directly applied to the flatness debugging work of the optical receiver, and particularly difficult to achieve leveling, and needs to be further improved.
Disclosure of Invention
The invention overcomes the defects in the prior art and provides a flatness leveling method for a cable television optical receiver.
The invention discloses a flatness leveling method for a cable television optical receiver, which mainly aims to overcome the defects that in the impedance matching process, in order to meet the requirement of link impedance, the link is too long and is difficult to avoid, the capacitive reactance and inductive reactance of a device cannot be ignored, the link impedance is not matched, the flatness is not good and the like.
The invention discloses a flatness leveling method for a cable television optical receiver, which aims to overcome the defects that if multi-stage amplification occurs in a link, flatness curves between chips can be overlapped under specific conditions, and further flatness is deteriorated.
The invention adopts the following technical scheme that the flatness leveling method for the cable television optical receiver comprises the following steps:
step S1: when a link is designed, at least one protection device and a coupling device which is corresponding to the protection device and is used for balancing capacitive reactance and inductive reactance are additionally arranged;
step S2: when the link is wired, at least one grounding capacitor is reserved to offset inductive reactance exceeding a threshold value generated by overlong wired link;
step S3: when the link is debugged, the capacitive reactance and the inductive reactance of the whole link are adaptively adjusted by a preset manual touch debugging method, so that the flatness of the whole link is optimized.
According to the above technical solution, as a further preferable technical solution of the above technical solution, in step S1, each of the protection devices has at least one junction capacitor, and the coupling device is implemented as an inductor.
According to the above technical solution, as a further preferable technical solution of the above technical solution, the step S1 is specifically implemented as the following steps:
step S1.1: each protection device is provided with at least one junction capacitor, so that the necessary impedance is biased to be capacitive in a design link;
step S1.2: at least one inductor for offsetting the capacitance is additionally arranged in the link so as to offset the overall capacitance of the link.
According to the above technical solution, as a further preferable technical solution of the above technical solution, in step S3, the manual touch debugging method is specifically implemented as the following steps:
step S3.1: the link is touched by a finger to enable the finger to be in contact with a circuit of the link, and capacitive reactance is generated;
step S3.2: observing the integral reflection condition of the link through a specified flatness detecting instrument, simultaneously judging the integral reflection value of the link, if the reflection value is large, executing the step S3.3, otherwise, executing the step S3.4;
step S3.3: a capacitor is additionally arranged at a reasonable position of the link;
step S3.4: and an inductor is additionally arranged at a reasonable position of the link.
According to the above technical solution, as a further preferable technical solution of the above technical solution, in step S3, increasing the magnitude of the capacitance inductance is positively correlated with the strength of the finger touching the link.
The patent application of the invention also discloses a flatness leveling method for the cable television optical receiver, which comprises the following steps:
step T0: when the link is designed, at least one auxiliary circuit related to the flatness of the amplification chip is additionally arranged so as to comprehensively consider the flatness of the amplification chip;
step T1: when a link is designed, at least one protection device and a coupling device which is corresponding to the protection device and is used for balancing capacitive reactance and inductive reactance are additionally arranged;
step T2: when the link is wired, at least one grounding capacitor is reserved to offset inductive reactance exceeding a threshold value generated by overlong wired link;
step T3: when the link is debugged, the capacitive reactance and the inductive reactance of the whole link are adaptively adjusted by a preset manual touch debugging method, so that the flatness of the whole link is optimized.
According to the above technical solution, as a further preferable technical solution of the above technical solution, in step T0, the auxiliary circuit includes but is not limited to: one or more of a feedback circuit, an RC circuit, an LC circuit.
According to the above technical solution, as a further preferable technical solution of the above technical solution, in step T1, each of the protection devices has at least one junction capacitor, the coupling device is implemented as an inductor, and step T1 is implemented as the following steps:
step T1.1: each protection device is provided with at least one junction capacitor, so that the necessary impedance is biased to be capacitive in a design link;
step T1.2: at least one inductor for offsetting the capacitance is additionally arranged in the link so as to offset the overall capacitance of the link.
According to the above technical solution, as a further preferable technical solution of the above technical solution, in step T3, the manual touch debugging method is specifically implemented as the following steps:
step T3.1: the link is touched by a finger to enable the finger to be in contact with a circuit of the link, and capacitive reactance is generated;
step T3.2: observing the integral reflection condition of the link through a specified flatness detecting instrument, simultaneously judging the integral reflection value of the link, if the reflection value is large, executing a step T3.3, otherwise, executing a step T3.4;
step T3.3: a capacitor is additionally arranged at a reasonable position of the link;
step T3.4: and an inductor is additionally arranged at a reasonable position of the link.
According to the above technical solution, as a further preferable technical solution of the above technical solution, in step T3, the magnitude of the increased capacitance and inductance is positively correlated with the strength of the finger touching the link.
The flatness leveling method for the cable television optical receiver has the advantages of overcoming the defect of poor flatness and realizing the integral leveling of the link.
Detailed Description
The invention discloses a flatness leveling method for a cable television optical receiver, and the following describes the specific implementation of the invention in detail with reference to the preferred embodiment.
PREFERRED EMBODIMENTS
Preferably, the flatness leveling method for the cable television optical receiver includes the following steps:
step S1: when a link is designed, at least one protection device and a coupling device which is corresponding to the protection device and is used for balancing capacitive reactance and inductive reactance are additionally arranged;
step S2: when the link is wired, at least one grounding capacitor is reserved to offset inductive reactance exceeding a threshold value generated by overlong wired link;
step S3: when the link is debugged, the capacitive reactance and the inductive reactance of the whole link are adaptively adjusted by a preset manual touch debugging method, so that the flatness of the whole link is optimized.
Further, as a first specific implementation manner of the preferred embodiment, in step S1, each of the protection devices has at least one junction capacitor, and the coupling device is implemented as an inductor.
Further, step S1 is specifically implemented as the following steps:
step S1.1: each protection device is provided with at least one junction capacitor, so that the necessary impedance is biased to be capacitive in a design link;
step S1.2: at least one inductor for offsetting the capacitance is additionally arranged in the link so as to offset the overall capacitance of the link.
Further, preferably, the junction capacitance of each of the protection devices corresponds to the inductance one to one.
Wherein the number of the junction capacitance and the inductance is preferably 2.
It should be noted that, in the first embodiment, those skilled in the art should note that the number of the junction capacitances and the inductances should not be construed as limited to only 2, but should be construed as being self-adjustable according to actual needs. The number is preferably 2 for example only.
Further, as a second specific implementation manner of the preferred embodiment, in step S3, the manual touch debugging method is specifically implemented as the following steps:
step S3.1: the link is touched by a finger (in the debugging process) to enable the finger to be in contact with the circuit of the link, so that capacitive reactance is generated;
step S3.2: observing the integral reflection condition of the link through a specified flatness detecting instrument, simultaneously judging the integral reflection value of the link, if the reflection value is large (indicating that the impedance matching is better), executing a step S3.3, otherwise, executing a step S3.4 (the reflection value is small);
step S3.3: a capacitor is additionally arranged at a reasonable position of the link;
step S3.4: and an inductor is additionally arranged at a reasonable position of the link.
In other words, when a finger touches the circuitry of the link, the better the reflection value, the more capacitance is accounted for, and the worse the value, the more inductance is accounted for by the link.
It is worth mentioning that, in step S3, the magnitude of the capacitance inductance is increased to be positively correlated with the strength of the finger touching the link, and the larger the strength is, the larger the capacitance value is.
A first embodiment.
Preferably, the flatness leveling method for the cable television optical receiver includes the following steps:
step T0: when the link is designed, at least one auxiliary circuit related to the flatness of the amplification chip is additionally arranged so as to comprehensively consider the flatness of the amplification chip;
step T1: when a link is designed, at least one protection device and a coupling device which is corresponding to the protection device and is used for balancing capacitive reactance and inductive reactance are additionally arranged;
step T2: when the link is wired, at least one grounding capacitor is reserved to offset inductive reactance exceeding a threshold value generated by overlong wired link;
step T3: when the link is debugged, the capacitive reactance and the inductive reactance of the whole link are adaptively adjusted by a preset manual touch debugging method, so that the flatness of the whole link is optimized.
Further, as a first specific implementation manner of the first embodiment, in step T0, the auxiliary circuit includes but is not limited to: one or more of a feedback circuit, an RC circuit, an LC circuit to facilitate testing.
Further, as a second specific implementation manner of the first embodiment, in step T1, each of the protection devices has at least one junction capacitor, and the coupling device is implemented as an inductor.
Further, step T1 is specifically implemented as the following steps:
step T1.1: each protection device is provided with at least one junction capacitor, so that the necessary impedance is biased to be capacitive in a design link;
step T1.2: at least one inductor for offsetting the capacitance is additionally arranged in the link so as to offset the overall capacitance of the link.
Further, preferably, the junction capacitance of each of the protection devices corresponds to the inductance one to one.
Wherein the number of the junction capacitance and the inductance is preferably 2.
It should be noted that, in the second embodiment, those skilled in the art should note that the number of the junction capacitances and the inductances should not be construed as limited to only 2, but should be construed as being self-adjustable according to actual needs. The number is preferably 2 for example only.
Further, as a third specific implementation manner of the first embodiment, in step T3, the manual touch debugging method is specifically implemented as the following steps:
step T3.1: the link is touched by a finger (in the debugging process) to enable the finger to be in contact with the circuit of the link, so that capacitive reactance is generated;
step T3.2: observing the integral reflection condition of the link through a specified flatness detecting instrument, simultaneously judging the integral reflection value of the link, if the reflection value is large (indicating that the impedance matching is better), executing a step T3.3, otherwise, executing a step T3.4 (the reflection value is small);
step T3.3: a capacitor is additionally arranged at a reasonable position of the link;
step T3.4: and an inductor is additionally arranged at a reasonable position of the link.
In other words, when a finger touches the circuitry of the link, the better the reflection value, the more capacitance is accounted for, and the worse the value, the more inductance is accounted for by the link.
It is worth mentioning that, in the step T3, the magnitude of the increased capacitance inductance is positively correlated with the strength of the finger touching the link, and the larger the strength is, the larger the capacitance value is.
It should be noted that technical features such as strength when a finger touches a link according to the present invention should be regarded as the prior art, and specific structures, operation principles, control manners and spatial arrangement manners of the technical features may be selected conventionally in the field, and should not be regarded as the invention points of the present invention, and the present invention is not further specifically described in detail.
It will be apparent to those skilled in the art that modifications and equivalents may be made in the embodiments and/or portions thereof without departing from the spirit and scope of the present invention.
Claims (8)
1. A flatness leveling method for a cable television optical receiver is characterized by comprising the following steps:
step S1: when a link is designed, at least one protection device and a coupling device which is corresponding to the protection device and is used for balancing capacitive reactance and inductive reactance are additionally arranged;
step S2: when the link is wired, at least one grounding capacitor is reserved to offset inductive reactance exceeding a threshold value generated by overlong wired link;
step S3: when the link is debugged, the capacitive reactance and the inductive reactance of the whole link are adaptively adjusted by a preset manual touch debugging method, so that the flatness of the whole link is optimized;
in step S3, the manual touch debugging method is specifically implemented as the following steps:
step S3.1: the link is touched by a finger to enable the finger to be in contact with a circuit of the link, and capacitive reactance is generated;
step S3.2: observing the integral reflection condition of the link through a specified flatness detecting instrument, simultaneously judging the integral reflection value of the link, if the reflection value is large, executing the step S3.3, otherwise, executing the step S3.4;
step S3.3: a capacitor is additionally arranged at a reasonable position of the link;
step S3.4: and an inductor is additionally arranged at a reasonable position of the link.
2. The method as claimed in claim 1, wherein in step S1, each of the protection devices has at least one junction capacitor, and the coupling device is implemented as an inductor.
3. The method as claimed in claim 2, wherein the step S1 is implemented as the following steps:
step S1.1: each protection device is provided with at least one junction capacitor, so that the necessary impedance is biased to be capacitive in a design link;
step S1.2: at least one inductor for offsetting the capacitance is additionally arranged in the link so as to offset the overall capacitance of the link.
4. The method as claimed in claim 3, wherein the step S3 is performed such that the magnitude of the capacitance and inductance increase is positively correlated to the strength of the finger touching the link.
5. A flatness leveling method for a cable television optical receiver is characterized by comprising the following steps:
step T0: when the link is designed, at least one auxiliary circuit related to the flatness of the amplification chip is additionally arranged so as to comprehensively consider the flatness of the amplification chip;
step T1: when a link is designed, at least one protection device and a coupling device which is corresponding to the protection device and is used for balancing capacitive reactance and inductive reactance are additionally arranged;
step T2: when the link is wired, at least one grounding capacitor is reserved to offset inductive reactance exceeding a threshold value generated by overlong wired link;
step T3: when the link is debugged, the capacitive reactance and the inductive reactance of the whole link are adaptively adjusted by a preset manual touch debugging method, so that the flatness of the whole link is optimized;
in step T3, the manual touch debugging method is specifically implemented as the following steps:
step T3.1: the link is touched by a finger to enable the finger to be in contact with a circuit of the link, and capacitive reactance is generated;
step T3.2: observing the integral reflection condition of the link through a specified flatness detecting instrument, simultaneously judging the integral reflection value of the link, if the reflection value is large, executing a step T3.3, otherwise, executing a step T3.4;
step T3.3: a capacitor is additionally arranged at a reasonable position of the link;
step T3.4: and an inductor is additionally arranged at a reasonable position of the link.
6. The method for leveling flatness of a cable TV optical receiver according to claim 5, wherein in step T0, the auxiliary circuit includes but is not limited to: one or more of a feedback circuit, an RC circuit, an LC circuit.
7. The method as claimed in claim 5, wherein in step T1, each of the protection devices has at least one junction capacitor, the coupling device is implemented as an inductor, and step T1 is implemented as the following steps:
step T1.1: each protection device is provided with at least one junction capacitor, so that the necessary impedance is biased to be capacitive in a design link;
step T1.2: at least one inductor for offsetting the capacitance is additionally arranged in the link so as to offset the overall capacitance of the link.
8. The method as claimed in claim 5, wherein the step T3 is performed such that the magnitude of the capacitance and inductance increase is positively correlated to the strength of the finger touching the link.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010563835.3A CN111770296B (en) | 2020-06-19 | 2020-06-19 | Flatness leveling method for cable television optical receiver |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010563835.3A CN111770296B (en) | 2020-06-19 | 2020-06-19 | Flatness leveling method for cable television optical receiver |
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| CN111770296A CN111770296A (en) | 2020-10-13 |
| CN111770296B true CN111770296B (en) | 2021-11-26 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104461136A (en) * | 2014-12-03 | 2015-03-25 | 无锡华润矽科微电子有限公司 | Dynamic threshold adjusting circuit in touch-control device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8009763B2 (en) * | 2008-04-02 | 2011-08-30 | Oracle America, Inc. | Method and apparatus for equalizing a high speed serial data link |
| US8779868B2 (en) * | 2011-03-10 | 2014-07-15 | Harris Corporation | Mobile wireless communications device with adjustable impedance matching network and associated methods |
| CN102929422B (en) * | 2011-08-10 | 2017-04-12 | 谱瑞科技股份有限公司 | Force sensing capacitive hybrid touch sensor |
| TWI529578B (en) * | 2013-12-27 | 2016-04-11 | Egalax Empia Technology Inc | Touch device and its touch judgment method |
| CN206135846U (en) * | 2016-10-31 | 2017-04-26 | 河北鸿捷电子科技有限公司 | There is high suppression degree of outband just to require high pass filter of in -band flatness |
| CN107682085B (en) * | 2017-10-23 | 2024-02-20 | 无锡路通视信网络股份有限公司 | Optical fiber dispersion electric compensation and flatness compensation circuit and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104461136A (en) * | 2014-12-03 | 2015-03-25 | 无锡华润矽科微电子有限公司 | Dynamic threshold adjusting circuit in touch-control device |
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