CN2309019Y - Television signal amplifier - Google Patents
Television signal amplifier Download PDFInfo
- Publication number
- CN2309019Y CN2309019Y CN 96224903 CN96224903U CN2309019Y CN 2309019 Y CN2309019 Y CN 2309019Y CN 96224903 CN96224903 CN 96224903 CN 96224903 U CN96224903 U CN 96224903U CN 2309019 Y CN2309019 Y CN 2309019Y
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- circuit
- output
- electric capacity
- level
- inductance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model relates to a television signal amplifier, comprising an input level regulating circuit, an equalizing circuit, an amplifying circuit, an output monitoring circuit and a power circuit. The utility model is provided with an output level slope regulating circuit connected in series between a television signal amplifying circuit and the output monitoring circuit. The circuit can separate and regulate and synthesize television signals without selecting an equalizing slice used for lowering the signal level of the lower end in an input level of the television signal amplifying circuit so as to ensure that the level between any one channel of a system output interface is not greater than the index of 10 dB. Thus, the utility model improves the carrier to noise ratio of the low channel and ensures consistency of the carrier to noise ratio of each channel. Meanwhile, the utility model solves the conflict of the carrier to noise ratio and the level difference not greater than 10 dB of any one channel.
Description
The utility model belongs to a kind of subscriber's amplifier (or claiming distribution amplifier) in the cable TV transmission network network.
The subscriber's amplifier that is used for CATV Project at present, be divided into several types such as integrated circuit, thick film circuit and discrete component assembling substantially, function according to the amplifier built-up circuit, flow process by TV signal, its circuit structure block diagram is adjusted circuit 1, equalizing circuit 2 by incoming level basically all as shown in Figure 1, amplifying circuit 3, several sections such as output, observation circuit 4 are formed.The subscriber's amplifier of this structure, be used in short-range distribution network, every technical indicator can meet the demands basically, when being used in the distribution network of long distance, in order to satisfy the ministry standard that level difference between arbitrary channel is not more than 10dB, compromise commonly used in current engineering is to select suitable balanced inserted sheet for use, make the low-side signal level ratio high-side signal of input subscriber's amplifier low, then the output level of amplifier is that low side is than high-end low tilting, the System Outlet level at the first family of result is that low side is lower than high-end, the family then is that low side is than high-side signal level height endways, level difference is not more than 10dB between arbitrary channel though can satisfy like this, requirement: but forced down the low channel level in amplifier input terminal, then therefore the carrier-to-noise ratio of low channel just reduces than high channel, and the contradiction of these two technical indicators of level difference just is difficult to coordinate between carrier-to-noise ratio and arbitrary channel.
The purpose of this utility model is to provide a kind of and is applicable in the long range transmission networks, can guarantee that arbitrary channel level difference is not more than 10dB, does not reduce the TV signal amplifiers of any channel carrier-to-noise ratio simultaneously again.
For achieving the above object, the utility model is to be connected in series an output level slew rate adjustment circuit between TV signal amplifying circuit and output, observation circuit, this circuit is a characteristic of utilizing inductor, capacitor, composition series connection accent shakes or forms antiresonant circuit, select for use SJ-B to make adjustable no part, TV signal can be separated into low-frequency range, Mid Frequency and high band, its function is the collection frequency division, and---adjusting (or part is straight-through by slope)---is mixed into the synthetic circuit of one.
Because the effect of output level slew rate adjustment circuit, need not select balanced sheet to force down low-side signal level in the TV signal amplifying circuit incoming level, just can guarantee that level difference is not more than the carrier-to-noise ratio that 10dB has so just improved low channel between arbitrary channel, guarantee the consistency of each channel carrier-to-noise ratio.
The utility model will be further described below in conjunction with the drawings and specific embodiments.
Fig. 1 is not improved subscriber's amplifier block diagram at present;
Fig. 2 is the utility model block diagram;
Fig. 3 is the distribution network schematic diagram;
Fig. 4 is the utility model circuit theory diagrams;
Fig. 5, Fig. 6, Fig. 7 are three kinds of dissimilar circuit theory diagrams of the utility model output level slew rate adjustment circuit.
Claims (1)
1. TV signal amplifiers, comprise incoming level adjustment circuit, equalizing circuit, amplifying circuit, output observation circuit and power circuit, it is characterized in that: in amplifying circuit and output, serial connection one output level slew rate adjustment circuit between the observation circuit, this circuit is to utilize inductor, the characteristic of capacitor, form series resonance or form antiresonant circuit, select the SJ-B adjustable element for use, TV signal can be separated into low-frequency range, Mid Frequency and high band, specifically consisting of of this circuit: the output of TV signal amplifying circuit connects inductance (L1), (L1) electric capacity (C1) ground connection is leaded up in output, one the tunnel is connected in series electric capacity (C2) successively, resistance (R1), inductance (L2) and electric capacity (C3), also have one the tunnel behind inductance (L4) and electric capacity (C5), to export and be connected with electric capacity (C3), again through inductance (L5), electric capacity (C6) serial connection back ground connection, (L5) output connects output monitoring circuit, two inputs of S-JB adjuster are connected in parallel on resistance (R1), electric capacity (C2) two ends connect inductance (L3) after the centre tap of its earth terminal and inductance (L2) is connected together, the parallel circuits that electric capacity (C4) is formed is ground connection again; (L1) and (C1) form coupling and promote circuit, (L4) and (C5) form the high frequency band signal passage, (C2), (R1), (L2), (C3) form the Mid Frequency signalling channel, (SJ-B), (L3), (C4) and right half part (L2) (C3) are formed the adjustable channels of low-band signal, by (L3) and the network of (C4) forming be serially connected in the earth terminal of SJ-B, (L5) and (C6) form coupling and promote circuit.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN 96224903 CN2309019Y (en) | 1996-11-08 | 1996-11-08 | Television signal amplifier |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN 96224903 CN2309019Y (en) | 1996-11-08 | 1996-11-08 | Television signal amplifier |
Publications (1)
Publication Number | Publication Date |
---|---|
CN2309019Y true CN2309019Y (en) | 1999-02-24 |
Family
ID=33903730
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN 96224903 Expired - Fee Related CN2309019Y (en) | 1996-11-08 | 1996-11-08 | Television signal amplifier |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN2309019Y (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102695009A (en) * | 2012-05-29 | 2012-09-26 | 昆山锐芯微电子有限公司 | Method and device for mapping gain conversion of image sensors |
-
1996
- 1996-11-08 CN CN 96224903 patent/CN2309019Y/en not_active Expired - Fee Related
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102695009A (en) * | 2012-05-29 | 2012-09-26 | 昆山锐芯微电子有限公司 | Method and device for mapping gain conversion of image sensors |
CN102695009B (en) * | 2012-05-29 | 2014-10-22 | 昆山锐芯微电子有限公司 | Method and device for mapping gain conversion of image sensors |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
C14 | Grant of patent or utility model | ||
GR01 | Patent grant | ||
C19 | Lapse of patent right due to non-payment of the annual fee | ||
CF01 | Termination of patent right due to non-payment of annual fee |