CN2901737Y - Slope varable equalizer - Google Patents
Slope varable equalizer Download PDFInfo
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- CN2901737Y CN2901737Y CNU2006200546543U CN200620054654U CN2901737Y CN 2901737 Y CN2901737 Y CN 2901737Y CN U2006200546543 U CNU2006200546543 U CN U2006200546543U CN 200620054654 U CN200620054654 U CN 200620054654U CN 2901737 Y CN2901737 Y CN 2901737Y
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- equalizer
- variable attenuator
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- slope
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Abstract
The utility model discloses a variable-slope equalizer, comprising a series resonant circuit constituted by the first inductance and the first capacitor, a parallel resonant circuit constituted by the second capacitor and the second inductance, a mobile variable attenuator and an impedance converter, wherein the mobile variable attenuator comprises an input and two outputs, that are, the first output and the second output; The impedance converter comprises an input, an output and an intermediate tap; One end of the series resonant circuit is connected to the input of the variable attenuator while the other end is connected to the output of the impedance converter; and one end of the parallel resonant circuit is earthed while the other end is connected to the output of the mobile variable attenuator and the intermediate tap of the impedance converter; The output of the mobile variable attenuator and the input of the impedance converter are connected up. The slope of the equalizer can be adjusted according to the actual needs by choosing the according attenuation value. The topology of the circuit is simple, and the cost is low, more over, the equalizer is adjustable reliably and easy to operate.
Description
Technical field
The utility model relates to wired TV RF signals slope-compensation equalizer, relates in particular to a kind of slope variable equalizer.
Background technology
In the CATV system, the transmission field by using coaxial cable of TV signal, because there is high-frequency loss in the insulating material between the coaxial cable internal and external conductor, the signal to different high frequencies in cable transmission has different decay, be that the high band decay is big, the low-frequency range decay is little.Therefore, need compress decay to the strong signal of low-frequency range, high frequency band signal is improved relatively, promptly input signal be carried out equilibrium treatment, to reach the identical substantially purpose of high and low frequency range output level with equalizer.
The equalizer of present common use is a kind of to be fixed equalizer, another kind is the continuous variable equalizer, the equilibrium quantity of fixed equalizer be interrupted, stepping, can't compensate the differential declines amount of different cables to different frequency, and the continuous variable equalizer, the attenuation of its attenuator is at random, and is unpredictable, and the slope that makes equalizer also is unpredictable.
Summary of the invention
For overcoming above shortcoming, the utility model provides a kind of circuit simple, reliable slope variable equalizer easy to adjust.
To achieve the above object of the invention, the utility model slope variable equalizer, the antiresonant circuit, a plug-in variable attenuator and the impedance transformer that comprise the series resonant circuit formed by first inductance and first electric capacity, form by second inductance and second electric capacity, described plug-in variable attenuator comprises an input and two outputs, i.e. first output and second output; Impedance transformer comprises: an input, an output and a centre tap; One end of described series resonant circuit connects the input of plug-in variable attenuator, and the other end connects the output of impedance transformer; Antiresonant circuit one end ground connection, the other end connects the output of plug-in variable attenuator and the centre tap of impedance transformer; The output of plug-in variable attenuator links to each other with the input of impedance transformer.
The π type attenuator that described plug-in variable attenuator can be a standard, T type attenuator or bridge T type attenuator.
Described first inductance: 2nH-10nH; First electric capacity: 1pF-10pF; Second inductance: 3nH-15nH; Second electric capacity: 1pF-10pF; The turn ratio of impedance transformer 3: 3; Plug-in variable attenuator: 0dB-15dB.
Owing to adopted the plug-in variable attenuator in the utility model slope variable equalizer circuit, equalizer slope that can be is according to actual needs selected corresponding pad value for use.The frequency response or the slope variation of other elements in can the fine compensation transmission system be to obtain flatness preferably.Circuit structure is simple, cost is lower, regulate reliable, easy to operate, and the plug attenuator draws materials easily, meets engine request during adjusting Different Slope amount, more satisfactory compensation TV signal in transmission to the differential declines of different high frequencies, make the signal strength signal intensity basically identical, can solve intermodulation, intermodulation phenomena that cable TV signal occurs effectively, and the disturbed phenomenons of multiple signal such as not fogging, snowflake, striped interference, distortion.
Description of drawings
Fig. 1 is the circuit theory diagrams of the utility model slope variable equalizer;
Fig. 2 is the amplitude-frequency characteristic curve chart of the utility model slope variable equalizer;
Fig. 3 is the equivalent schematic diagram of the utility model slope variable equalizer.
Embodiment
Describe the utility model most preferred embodiment in detail below in conjunction with accompanying drawing.
In the slope variable equalizer circuit theory diagrams as shown in Figure 1, the antiresonant circuit, a plug-in variable attenuator A1 and the impedance transformer T1 that comprise the series resonant circuit formed by first inductance L 1 and first capacitor C 1, form by second inductance L 2 and second capacitor C 2, plug-in variable attenuator A1 comprises an input 1 and two outputs, i.e. first output 2 and second output 3.Impedance transformer T1 comprises: an input 1, an output 2 and a centre tap 3.One end of series resonant circuit connects the input 1 of plug-in variable attenuator A1, and the other end connects the output 2 of impedance transformer T1.Antiresonant circuit one end ground connection, the other end connect the output 2 of plug-in variable attenuator A1 and the centre tap 3 of impedance transformer T1.The output 3 of plug-in variable attenuator A1 links to each other with the input 1 of impedance transformer T1.Use the plug-in variable attenuator A1 of differential declines value, can change the slope of equalizer in working band.Wherein, plug-in variable attenuator A1 can be π type attenuator, T type attenuator or the bridge T type attenuator of standard.The span of each element in this circuit adopts the first inductance L 1:2nH-10nH; The first capacitor C 1:1pF-10pF; The second inductance L 2:3nH-15nH; The second capacitor C 2:1pF-10pF; The turn ratio of impedance transformer T1 3: 3; Plug-in variable attenuator A1:0dB-15dB.In the present embodiment, the first inductance L 1:6nH, the first capacitor C 1:5pF, the second inductance L 2:8nH, the second capacitor C 2:4pF, the turn ratio of impedance transformer T1 3: 3, plug-in variable attenuator A1:0dB-15dB.
In the working frequency range frequency was the scope of 45MHz-870MHz, series resonant circuit and antiresonant circuit were used for carrying out in whole working frequency range tuning, produced the frequency response that meets the demands, and produced low-loss (being generally less than 0.5dB) at the highest frequency place.Simultaneously, the attenuation at frequency response curve low-limit frequency place is by the pad value decision of plug-in variable attenuator A1.When changing the pad value of plug-in variable attenuator A1, the frequency response curve in working frequency range (it is motionless that highest frequency point keeps) moves (moving down) on the whole along with moving (moving down) on the low-limit frequency place attenuation, has also promptly changed the slope of equalizer.Wherein: the cut-off frequency f of equalizer
0Satisfy equation:
-Shi 2.
Fig. 2 is the transfer curve a of the utility model slope variable equalizer, and b, c be the different pad value of corresponding plug-in attenuator A1 respectively | a0|, | a1| and | a2|, and | a0|＜| a1|＜| a2|.Pad value a1=a0-Δ a, a2=a1-Δ a
1=a0-Δ a-Δ a
1, wherein, Δ a represents the difference of the pad value of transmission curve a and b, its size is 1dB-14dB; Δ a
1The difference of the pad value of expression transmission curve b and c, its size is 1dB-13dB, by that analogy, selects the plug-in variable attenuator A1 of corresponding pad value according to the transmission characteristic of equalizer.
Slope variable equalizer equivalent circuit diagram as shown in Figure 3, arm resistance Rc, Re and pure resistance Rd form a bridge T type four-terminal network, and this bridge T type four-terminal network is equivalent to plug-in variable attenuator A1.Wherein resistor R d equals the characteristic impedance Ro of bridge-T network, and Re strides arm impedance Z e, and Rc is and arm impedance Z c.Work as impedance
-Shi 1, and then the characteristic impedance of bridge-T network is constant-resistance Ro.Satisfy formula 1, when the resistance of Rc increased, the resistance of Re reduced thereupon; Otherwise when the resistance of Rc reduced, the resistance of Re but increased.And the change in resistance curve of Rc, Re will reach the electrical quantity requirement of equalizer, can obtain the variable equalizer of slope.
Claims (3)
1, a kind of slope variable equalizer, it is characterized in that, the antiresonant circuit, a plug-in variable attenuator (A1) and the impedance transformer (T1) that comprise the series resonant circuit formed by first inductance (L1) and first electric capacity (C1), form by second inductance (L2) and second electric capacity (C2), described plug-in variable attenuator (A1) comprises an input (1) and two outputs, i.e. first output (2) and second output (3); Impedance transformer (T1) comprising: an input (1), an output (2) and a centre tap (3); One end of described series resonant circuit connects the input (1) of plug-in variable attenuator (A1), and the other end connects the output (2) of impedance transformer (T1); Antiresonant circuit one end ground connection, the other end connects the output (2) of plug-in variable attenuator (A1) and the centre tap (3) of impedance transformer (T1); The output (3) of plug-in variable attenuator (A1) links to each other with the input (1) of impedance transformer (T1).
2, slope variable equalizer according to claim 1 is characterized in that, described plug-in variable attenuator (A1) can be π type attenuator, T type attenuator or the bridge T type attenuator of standard.
3, slope variable equalizer according to claim 1 is characterized in that, described first inductance (L1): 2nH-10nH; First electric capacity (C1): 1pF-10pF; Second inductance (L2): 3nH-15nH; Second electric capacity (C2): 1pF-10pF; The turn ratio of impedance transformer (T1) 3: 3; Plug-in variable attenuator (A1): 0dB-15dB.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006200546543U CN2901737Y (en) | 2006-01-25 | 2006-01-25 | Slope varable equalizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006200546543U CN2901737Y (en) | 2006-01-25 | 2006-01-25 | Slope varable equalizer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2901737Y true CN2901737Y (en) | 2007-05-16 |
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ID=38085901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2006200546543U Expired - Lifetime CN2901737Y (en) | 2006-01-25 | 2006-01-25 | Slope varable equalizer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2901737Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012146952A1 (en) | 2011-04-29 | 2012-11-01 | Terra, Uab | Radio-frequency circuit assembly |
| CN109286586A (en) * | 2018-09-26 | 2019-01-29 | 昆明理工大学 | A kind of attenuation equalizer and application |
| CN109756691A (en) * | 2018-11-30 | 2019-05-14 | 宁波环球广电科技有限公司 | A kind of automatically controlled equalization compensation device of general purpose type high accuracy |
| CN111077815A (en) * | 2019-11-27 | 2020-04-28 | 成都芯通软件有限公司 | Compensation system and method for multi-band HFC (hybrid fiber coaxial) equipment with automatically tunable output level |
-
2006
- 2006-01-25 CN CNU2006200546543U patent/CN2901737Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012146952A1 (en) | 2011-04-29 | 2012-11-01 | Terra, Uab | Radio-frequency circuit assembly |
| CN109286586A (en) * | 2018-09-26 | 2019-01-29 | 昆明理工大学 | A kind of attenuation equalizer and application |
| CN109756691A (en) * | 2018-11-30 | 2019-05-14 | 宁波环球广电科技有限公司 | A kind of automatically controlled equalization compensation device of general purpose type high accuracy |
| CN111077815A (en) * | 2019-11-27 | 2020-04-28 | 成都芯通软件有限公司 | Compensation system and method for multi-band HFC (hybrid fiber coaxial) equipment with automatically tunable output level |
| CN111077815B (en) * | 2019-11-27 | 2021-08-31 | 成都芯通软件有限公司 | Compensation system and method for multi-band HFC (hybrid fiber coaxial) equipment with automatically tunable output level |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: SHENZHEN NEO PHOTONIC TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: SHENZHEN PHOTON BROADBAND TECHNOLOGY CO., LTD. Effective date: 20120220 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20120220 Address after: 518057 Guangdong city of Shenzhen province Nanshan District high tech Industrial Park in the Southern District of science and technology twelve South Road No. eight Frestech photoelectric building Patentee after: Shenzhen Neo Photonic Technology Co., Ltd. Address before: 518057 Guangdong city of Shenzhen province high tech Industrial Park in the Southern District of science and technology Feitong building twelve South Road Patentee before: Shenzhen Photon Broadband Technology Co., Ltd. |
|
| DD01 | Delivery of document by public notice |
Addressee: Sun Huaimei Document name: Notification of Passing Examination on Formalities |
|
| CX01 | Expiry of patent term |
Granted publication date: 20070516 |
|
| EXPY | Termination of patent right or utility model |