CN2681492Y - Broadband amplifier module for cable TV - Google Patents
Broadband amplifier module for cable TV Download PDFInfo
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- CN2681492Y CN2681492Y CNU2004200150918U CN200420015091U CN2681492Y CN 2681492 Y CN2681492 Y CN 2681492Y CN U2004200150918 U CNU2004200150918 U CN U2004200150918U CN 200420015091 U CN200420015091 U CN 200420015091U CN 2681492 Y CN2681492 Y CN 2681492Y
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Abstract
The utility model relates to a broadband amplifier module for a cable TV, with SOT115J encapsulation, and comprises a heat radiating base, a circuit board and an outer shell. A circuit on the circuit board comprises an input transformer, an output transformer and a power amplification circuit part. The input transformer and the power amplification circuit part are coupled through capacitance, and the output terminal of the power amplification circuit part is coupled with the output transformer through capacitance. The circuit on the circuit board also comprises a voltage transformation supply circuit part that comprises a pair of input terminals and at least one pair of output terminals. The voltage of the two input terminals and the voltage of the at least one pair of output terminals are different. The two input terminals are connected with an external supply electric source, and the output terminals are respectively connected to the input terminals of the working power supply of the power amplification circuit part. Compared with the prior art, a voltage transformation circuit is arranged in the module, accordingly, the selection of composition of the power amplification circuit can not be limited, the power supply voltage scope of the module can be improved, and the cost /price of the module can be greatly reduced.
Description
Technical field
The utility model relates to amplifier, particularly relates to the amplifier that is used for cable television system.
Background technology
At present, the cable television system amplifier that uses on the market, its inside mostly adopts the wide-band amplifier module to amplify in order to radio-frequency power to be provided, the product that the module of more employing has Philips semiconductors (Fei Lipu semiconductor company) to provide, as the BGD712 model, it adopts thick-film technique to make, SOT115J encapsulation, direct current 24V power supply.Because existing inside modules circuit mostly adopts discrete silicon technology element to constitute, as disclosed push-pull power amplifier module for cable TV in the Chinese patent 94113806, their input voltage value is subject to 24V or 12V, this formation that has just limited power amplification circuit is widely selected, thereby causes the cost/price of amplification module can't realize breaking through.
Summary of the invention
The technical problems to be solved in the utility model is to propose a kind of cable TV wide-band amplifier module, its inside is provided with voltage conversion circuit, thereby the input voltage range of module increases, the power amplification circuit form that can Gong select for use is varied, makes the cost/price of amplification module to reduce widely.
The technical scheme in the invention for solving the above technical problem is: manufacture and design a kind of cable TV wide-band amplifier module, the SOT115J encapsulation, comprise radio frequency input pin 1, radio frequency output pin 9, positive source pin 5, common port pin 2,3,7,8, this module comprises heat dissipation base, circuit board and shell, described circuit board is packaged in the shell, and the one side of circuit board is fitted with heat dissipation base, circuit comprises input transformer on the described circuit board, output transformer, the power amplification circuit part, one end of described input transformer connects the radio frequency input pin, the input of this transformer and power amplification circuit part passes through capacitive coupling, and the output of this circuit part and output transformer also pass through capacitive coupling, one end of this transformer connects the radio frequency output pin, circuit also comprises voltage transformation supply circuit part on the described circuit board, it comprises a pair of input and at least one pair of output, on the described input on voltage and at least one pair of output voltage there are differences, described two inputs are linked the positive source pin and the common port pin of module respectively, and described each output is linked the working power input of power amplification circuit part respectively.
Compare with prior art, this cable TV wide-band amplifier inside modules is provided with voltage conversion circuit, and formation that can the power-limiting amplifying circuit is selected, and not only can improve the module for power supply voltage range effectively, can also reduce the cost/price of module greatly.
Description of drawings
Fig. 1 is the structural representation of the utility model cable TV wide-band amplifier module embodiment.
Fig. 2 is the electric theory diagram of the utility model embodiment.
Fig. 3 is the electric principle schematic of the utility model embodiment.
Embodiment
Be described in further detail below in conjunction with the most preferred embodiment shown in the accompanying drawing.
As illustrated in fig. 1 and 2, the utility model cable TV wide-band amplifier module, adopt the SOT115J encapsulation, it has 9 pins, wherein pin 1 is the radio frequency input, pin 9 is radio frequency output, pin 5 is positive sources, pin 2,3,7, the 8th, common port, and pin 4,6 is empty, this module comprises heat dissipation base 10, circuit board (not shown) and shell 30, described circuit board adopts ceramic substrate, be packaged in the shell 30, and the one side of this circuit board is fitted with heat dissipation base 10, so that heat radiation, circuit comprises input transformer 21 on the described circuit board, output transformer 22, power amplification circuit part 23, one end of described input transformer 21 is a rf inputs, be connected to the pin 1 of module, pass through capacitive coupling between the input of this input transformer 21 and power amplification circuit part 23, also pass through capacitive coupling between the output of described power amplification circuit part 23 and the output transformer 22, one end of this output transformer 22 is a radio-frequency (RF) output end, be connected to the pin 9 of module, circuit also comprises voltage transformation supply circuit part 24 on the described circuit board, this circuit part 24 comprises two inputs and two outputs, on two inputs on voltage and two outputs voltage there are differences, its two inputs connect the positive pole of external power source and the pin 2 of module by the pin 5 of module respectively, 3,7,8 connect the negative pole of external power source, its two outputs are connected respectively to the power positive end and the negative terminal of power amplification circuit part 23, when the negative pole of external power source does not link to each other with described internal electric source negative terminal, can make the power supply of power amplification and external power source not altogether, to reduce the influence of module to other circuit; In altogether, then described internal electric source negative terminal links to each other with the pin 2,3,7,8 of module.
On above-mentioned two inputs on voltage and two outputs voltage there are differences and be meant: the input power supply is different with out-put supply, this comprises both different situations of magnitude of voltage, also comprise not altogether the identical situation of both magnitudes of voltage under the situation on ground, this moment, voltage transformation supply circuit part 24 actual functional capability was isolated power supply exactly.
As shown in Figure 3, circuit structure on the circuit board is: external radio-frequency signal is input to the end of transformer TL1 by pin 1, and deliver to integrated circuit (IC) 1 through coupling capacitance C1, C2, the input of IC2 is delivered in its output again by coupling capacitance C3, C4, the output of IC2 is sent transformer TL2 through coupling capacitance C6, C7, delivers to pin 9 outputs through the end of TL2.As can be seen: described integrated circuit (IC) 1 and IC2 have constituted power amplification circuit part 23 jointly, they are the broadband cabled TV amplifying circuits that adopt GaAs technology, model is KJ811, adopt the SOIC-8 packing forms, + 5V working power is provided by the strong wired company of cable network new technology of Shenzhen section; Described transformer TL1 has constituted input transformer 21, and transformer TL2 has constituted output transformer 22; And constituted voltage transformation supply circuit part 24 by integrated circuit (IC) 3 and peripheral circuit thereof, and the model of IC3 is 7805, adopts the nude film form, it can be the 9-24V dc voltage conversion of outside input+5V voltage, for IC1 and IC2 provide working power.
An embodiment of the present utility model is that the model that is provided by the strong wired company of cable network new technology of Shenzhen section is CATV (cable TV) amplifier module of KG820T, this modular power source accommodation is wide, have good linearty, flatness and reliability, noise is low, be applicable to the CATV system of 40-860MHz, it adopts ceramic substrate, the SOT115J encapsulation, supply voltage is direct current 9-24V, and impedance operator is 75 Ω radio frequency I/O pins.Its major parameter has:
| Code name | Parameter | Condition | Minimum | Maximum | Unit |
| G | Gain | f＝50MHz | 18 | 21 | dB |
| f＝860MHz | 18 | 21 | dB | ||
| Itot | Total work electric current | The DC12V power supply | - | 590 | mA |
Absolute rating:
| Code name | Parameter | Condition | Minimum | Maximum | Unit |
| VB | Service voltage | For a long time/continuously | 9 | 25 | V |
| Vi | The radio frequency input voltage | - | - | 50 | dBmV |
| Tstg | Storage temperature | - | -40 | +100 | ℃ |
| Tmb | Working temperature | - | -20 | +100 | ℃ |
Canonical parameter (bandwidth 40MHz-860MHz; VB=24V; Tcase=35 ℃; ZS=ZL=75 Ω):
| Code name | Parameter | Condition | Minimum | Maximum | Unit |
| G | Gain | f＝50MHz | 18 | 21 | dB |
| f＝860MHz | 18 | 21 | dB | ||
| SL | Equivalence cable slope | 40MHz-860MHz | -0.3 | 0.8 | dB |
| FL | Inband flatness | 40MHz-860MHz | ±0.2 | ±0.5 | dB |
| S11 | The input reflection loss | 40MHz-85MHz | 14 | - | dB |
| 85MHz-550MHz | 16 | - | dB | ||
| 550MHz-750MHz | 16 | - | dB | ||
| 750MHz-860MHz | 14 | - | dB | ||
| S22 | The output reflection loss | 40MHz-85MHz | 14 | - | dB |
| 85MHz-550MHz | 16 | - | dB | ||
| 550MHz-750MHz | 16 | - | dB | ||
| 750MHz-860MHz | 14 | - | dB | ||
| CTB | The CTB ratio | 60 road smooth signals; Vo=44dBmV test point: 543.25MHz | 64 | - | dB |
| Xmod | The intermodulation ratio | 60 road smooth signals; Vo=44dBmV test point: 49.75MHz | 68 | - | dB |
| CSO | The CSO ratio | 60 road smooth signals; Vo=44dBmV test point: 544.5MHz | 63 | - | dB |
| Vo | Maximum Output Level | Three sound intermodulations are than being-60dB | 122 | - | |
| NF | Noise factor | 40MHz-860MHz | - | 5 | dB |
| Itot | Total work electric current | The DC12V power supply | - | 590 | mA |
The most preferred embodiment of the above is intended to specify the mentality of designing of the utility model, is to be provided with voltage conversion circuit in inside modules on the one hand, power amplification circuit is constituted the restriction of selecting to break away from prior art; Be to adopt two commercial power chip cascades on the other hand so that necessary gain to be provided.The enforcement of the utility model, be not limited to the disclosed mode of above most preferred embodiment, all mentalities of designing based on the utility model, simply deduce and replace, such as adopting the DC/DC translation circuit to substitute 7805 circuit, the concrete cable TV wide-band amplifier module that obtains all belongs to enforcement of the present utility model.
Claims (10)
1, a kind of cable TV wide-band amplifier module, the SOT115J encapsulation, comprise radio frequency input pin 1, radio frequency output pin 9, positive source pin 5, common port pin 2,3,7,8, this module comprises heat dissipation base (10), circuit board and shell (30), described circuit board is packaged in the shell (30), and the one side of circuit board is fitted with heat dissipation base (10), circuit comprises input transformer (21) on the described circuit board, output transformer (22), power amplification circuit part (23), one end of described input transformer (21) connects the radio frequency input pin, this transformer (21) passes through capacitive coupling with the input of power amplification circuit part (23), and output of this circuit part (23) and output transformer (22) also pass through capacitive coupling, one end of this transformer (22) connects the radio frequency output pin, it is characterized in that:
Circuit also comprises voltage transformation supply circuit part (24) on the described circuit board, it comprises a pair of input and at least one pair of output, on the described input on voltage and at least one pair of output voltage there are differences, described two inputs are linked the positive source pin and the common port pin of module respectively, and described each output is linked the working power input of power amplification circuit part (23) respectively.
2, cable TV wide-band amplifier module as claimed in claim 1 is characterized in that: the part output of described voltage transformation supply circuit part (24) links to each other with the common port pin of module.
3, cable TV wide-band amplifier module as claimed in claim 1 or 2 is characterized in that: described power amplification circuit part (23) comprises the broadband cabled TV amplification circuit that adopts GaAs technology.
4, cable TV wide-band amplifier module as claimed in claim 3, it is characterized in that: the model of the broadband cabled TV amplification circuit of described employing GaAs technology is KJ811.
5, cable TV wide-band amplifier module as claimed in claim 4, it is characterized in that: described integrated circuit KJ811 has two, and they are by the capacitive coupling cascade.
6, cable TV wide-band amplifier module as claimed in claim 1 or 2 is characterized in that: it is connected with external power source with the common port pin by the positive source pin, and the supply power voltage of this external power source is direct current 9-24V.
7, cable TV wide-band amplifier module as claimed in claim 6 is characterized in that: voltage is direct current 5V on the pair of output of described voltage transformation supply circuit part (24).
8, cable TV wide-band amplifier module as claimed in claim 7 is characterized in that: described voltage transformation supply circuit part (24) comprises voltage transformation integrated circuit 7805.
9, cable TV wide-band amplifier module as claimed in claim 8 is characterized in that: described voltage transformation integrated circuit 7805 adopts nude film.
10, cable TV wide-band amplifier module as claimed in claim 1 or 2 is characterized in that: described circuit board adopts ceramic substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2004200150918U CN2681492Y (en) | 2004-01-16 | 2004-01-16 | Broadband amplifier module for cable TV |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2004200150918U CN2681492Y (en) | 2004-01-16 | 2004-01-16 | Broadband amplifier module for cable TV |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2681492Y true CN2681492Y (en) | 2005-02-23 |
Family
ID=34606335
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2004200150918U Expired - Fee Related CN2681492Y (en) | 2004-01-16 | 2004-01-16 | Broadband amplifier module for cable TV |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2681492Y (en) |
-
2004
- 2004-01-16 CN CNU2004200150918U patent/CN2681492Y/en not_active Expired - Fee Related
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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 |