CN202679315U - Distribution amplifier provided with noise suppression circuit - Google Patents
Distribution amplifier provided with noise suppression circuit Download PDFInfo
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- CN202679315U CN202679315U CN 201220291191 CN201220291191U CN202679315U CN 202679315 U CN202679315 U CN 202679315U CN 201220291191 CN201220291191 CN 201220291191 CN 201220291191 U CN201220291191 U CN 201220291191U CN 202679315 U CN202679315 U CN 202679315U
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Abstract
The utility model discloses a distribution amplifier which is provided with a noise suppression circuit. The distribution amplifier comprises a first connector, a first filter, a transformer, a voltage level control unit, a first amplifier, a picker, a second amplifier, a comparer, a switch circuit and a second connector. With the above structure, the distribution amplifier which is provided with the noise suppression circuit can prevent and effectively restrict upstream radio frequency noises from entering a television cable.
Description
Technical field
The utility model relates to a kind of distribution amplifier, and espespecially a kind of distribution amplifier with noise suppression circuit with a comparator and a switching circuit can prevent and establishment is uploaded in the cable that radio noise enters cable TV.
Background technology
Cable television system can provide the user to download (download) signal of video signal (the about 54MHz-1000MHz of its frequency) or transmit data (the about 5MHz-42MHz of its frequency) to the main frame of cable television system to upload (upstream) mode in box (set top box) mode on cable modem (cable modem) or the television set in the family at present.
So, the rf data of uploading that namely has simultaneously the signal of video signal of 54MHz-1000MHz and 5MHz-42MHz in the coaxial cable.But when user's uploading data, may be positioned at cable end or other reason because of the user, be full of various noises in the cable, the noise of hair-dryer or dust catcher for example, make noise also and then upload rf data and enter in the cable, be for example and without limitation to coaxial cable, so, will have a strong impact on the transmission quality of signal in the cable.
The technology that adopts at present existing coupler (tap), distributor (distributor) or the indoor amplifier (house amplifier) all is to adopt anti-electromagnetic interference coil (EMI core) to suppress noise, it can only suppress a little but can not close and upload channel, noise will continue to enter in the coaxial cable, therefore, effect is not remarkable.
The utility model content
For the shortcoming of above-mentioned existing coupler, distributor or indoor amplifier, the purpose of this utility model provides a kind of distribution amplifier with noise suppression circuit, to improve above-mentioned shortcoming.
A kind of distribution amplifier with noise suppression circuit of the present utility model, it comprises: one first connector, in order to input a radiofrequency signal; One first filter is coupled to this first connector, can carry out filtering to this radiofrequency signal; One transformer, it has one lateral coils and a second siding ring, and wherein the first end of this first siding ring is coupled to the output of this first filter, this radiofrequency signal can be coupled to this second siding ring; One voltage level control unit, its first end is coupled to the first end of the second siding ring of this transformer, in order to adjust the voltage level of this radiofrequency signal; One first amplifier, its first end are coupled to the second end of this voltage level control unit, can carry out voltage amplification to this radiofrequency signal; One detector, its first end is coupled to the output of this first amplifier, can detect this radiofrequency signal; One second amplifier is coupled to the output of this detector, can again carry out voltage amplification to this radiofrequency signal; One comparator, it has a first input end and one second input, and this first input end is coupled to a reference voltage, and this second input then is coupled to the output of this second amplifier, an exportable control signal; One switching circuit, its first end are coupled to the second end of the first siding ring of this transformer, and the second end then is coupled to the control signal of this comparator, can be closed or open according to this control signal, whether to determine this radiofrequency signal of output; And one second connector, be coupled to the 3rd end of this switching circuit, in order to export this radiofrequency signal.
Wherein, this first connector and the second connector are optical fiber connector or RJ-45 connector, and the frequency of this radiofrequency signal is 5MHz-42MHz, and this first filter is a band pass filter, and this voltage level control unit is a variable resistance.
Wherein, further has one first switch, place between this first filter and this transformer, its first end is coupled to the output of this first filter, the second end is coupled to the first end of the first siding ring of this transformer, whether can determine this radiofrequency signal of output, wherein this first switch is an electronic switch.
Wherein, further has one second filter, place between this transformer and this voltage level control unit, its first end is coupled to the first end of the second siding ring of this transformer, the second end is coupled to the first end of this voltage level control unit, can carry out filtering to the radiofrequency signal that this transformer is coupled, and this second filter is a band pass filter.
Wherein, further has an attenuator, place between this first amplifier and this detector, its first end is coupled to the output of this first amplifier, its the second end is coupled to the first end of this detector, can carry out decay to this radiofrequency signal, wherein, this detector is a diode, and this attenuator is a resistor.
Wherein, further has one the 3rd amplifier, place between this attenuator and this detector, its first end is coupled to the output of this attenuator, its output then is coupled to the first end of this detector, can again carry out voltage amplification to this radiofrequency signal, wherein, this first amplifier and the 3rd amplifier are a transistor circuit, and this second amplifier is an operational amplifier.
Wherein, further printed circuit board (PCB) is to carry this first connector, the first filter, the first switch, transformer, the first amplifier, attenuator, the second amplifier, detector, the 3rd amplifier, comparator, switching circuit and this second connector.
Wherein, further has a second switch, place on this printed circuit board (PCB) and between this first switch, switching circuit and this second connector, in order to this radiofrequency signal of control output to this second connector whether, wherein this second switch also is an electronic switch.
Wherein, further have:
One first power regulator, its first end are coupled to one first DC power supply, and the second end is then exported one second DC power supply, and this second DC power supply may be output to this first switch and second switch, and its required DC power supply is provided; And
One second source pressurizer, its first end is coupled to this second DC power supply, the second end is then exported one the 3rd DC power supply, and the 3rd DC power supply may be output to this first amplifier, the second amplifier, the 3rd amplifier and comparator, and its required DC power supply is provided.
Wherein, this first DC power supply is DC+12V, and this second DC power supply is DC+9V, and the 3rd DC power supply is DC+5V.
Wherein, further have a housing, with accommodating this printed circuit board (PCB), the first connector and the second connector, and this housing is made by plastic material.
The beneficial effects of the utility model: a purpose of the present utility model provides a kind of distribution amplifier with noise suppression circuit, and it has a detector and amplifier, can detect whether to upload radiofrequency signal and will enter in the cable.
Another purpose of the present utility model provides a kind of distribution amplifier with noise suppression circuit, it has a comparator and a switching circuit, can detect in this detector and upload radiofrequency signal, and this level of uploading radiofrequency signal is unlocked during greater than a reference potential, to enter in the cable so that this uploads radiofrequency signal, and when uploading end, close this switching circuit, enter in the cable thoroughly to prevent noise.
Another purpose of the present utility model provides a kind of distribution amplifier with noise suppression circuit, and it can be widely used in the master/passive type distribution amplifier.
Description of drawings
Fig. 1 is a schematic diagram, and it illustrates the block schematic diagram of the distribution amplifier with noise suppression circuit of the utility model one preferred embodiment.
Fig. 2 is a schematic diagram, and it illustrates the block schematic diagram of the switching circuit of the utility model one preferred embodiment.
Fig. 3 is a schematic diagram, and its distribution amplifier with noise suppression circuit that illustrates the utility model one preferred embodiment further has the schematic diagram of a printed circuit board (PCB).
Fig. 4 is a schematic diagram, and its distribution amplifier with noise suppression circuit that illustrates the utility model one preferred embodiment further has the schematic diagram of a housing.
Embodiment
For making your juror can further understand this novel structure, feature and purpose thereof, hereby be accompanied by being described in detail as follows of graphic and preferred embodiment.
Please in the lump referring to figs. 1 through Fig. 4, wherein, Fig. 1 illustrates the block schematic diagram of the distribution amplifier with noise suppression circuit of the utility model one preferred embodiment; Fig. 2 illustrates the block schematic diagram of the switching circuit of the utility model one preferred embodiment; The distribution amplifier with noise suppression circuit that Fig. 3 illustrates the utility model one preferred embodiment further has the schematic diagram of a printed circuit board (PCB); The distribution amplifier with noise suppression circuit that Fig. 4 illustrates the utility model one preferred embodiment further has the schematic diagram of a housing.
As shown in the figure, the amplification distributor with noise suppression circuit of the present utility model, it comprises: one first connector 10; One first filter 20; One transformer 30; One voltage level control unit 40; One first amplifier 50; One detector 60; One second amplifier 70; One comparator 80; One switching circuit 90; And one second connector 100 combine.
Wherein, this first connector 10 is for example and without limitation to the RJ-45 connector of the optical fiber connector (F-connector) or ethernet local area network network (Ethernet), in order to input in a radio frequency (RF) signal to the cable (not shown), its frequency is for example and without limitation to 5MHz-42MHz.
This first filter 20 is coupled to this first connector 10, can carry out filtering to this radiofrequency signal.This first filter 20 is for example and without limitation to logical (band-pass) filter of a band, and it filters frequency and is for example and without limitation to 5MHz-42MHz.
This transformer 30 has one lateral coils 31 and a second siding ring 32, and wherein the first end of this first siding ring 31 is coupled to the output of this first filter 20, in order to this radiofrequency signal is inputed to this second siding ring 32.
The first end of this voltage level control unit 40 is coupled to the first end of the second siding ring 32 of this transformer 30, the second end then is coupled to this first amplifier 50, in order to adjust the voltage level of this radiofrequency signal, wherein, this voltage level control unit is for example and without limitation to a variable resistance.
The first end of this first amplifier 50 is coupled to the second end of this voltage level control unit 40, can carry out voltage amplification to this radiofrequency signal.This first amplifier 50 is for example and without limitation to a transistor circuit, can carry out to the radiofrequency signal that the second siding ring 32 of this transformer 30 is exported the voltage amplification of about 15dB.
The first end of this detector (detector) 60 is coupled to the output of this first amplifier 50, can detect this radiofrequency signal.Wherein, this detector 60 is for example and without limitation to a peak value detector, can detect the peak value of this radiofrequency signal.
The first end of this second amplifier 70 is coupled to the output of this detector 60, can again carry out voltage amplification to this radiofrequency signal.Wherein, this second amplifier 70 is for example and without limitation to an operational amplifier.In addition, the output of this second amplifier 70 also can serve as into a test point (test point).
This comparator 80 has a first input end and one second input, this first input end is coupled to a reference voltage (Vref), be for example and without limitation to DC+1.5V, this the second input then is coupled to the output of this second amplifier 70, it has the exportable control signal of an output, when the output voltage of this second amplifier 70 is greater than or equal to DC+1.5V, this comparator 80 is namely exported the control signal of high potential, otherwise, when the output voltage of this second amplifier 70 was lower than DC+1.5V, this comparator 80 was namely exported the control signal of electronegative potential.The voltage level of these voltage level control unit 40 these test points of capable of regulating is to control the control signal of these comparator 80 outputs.
The first end of this switching circuit 90 is coupled to the second end of the first siding ring 31 of this transformer 30, and the second end then is coupled to the control signal of this comparator 80, can be closed or open according to this control signal, whether to determine this radiofrequency signal of output.
This second connector 100 is for example and without limitation to the RJ-45 connector of the optical fiber connector (F-connector) or ethernet local area network network (Ethernet), be coupled to the 3rd end (being output) of this switching circuit 90, upload radiofrequency signal in order to export this.And this first connector 10 and this second connector 100 can identical (for example both be all the optical fiber connector or RJ-45 connector) or the mode of different (for example another is RJ-45 connector for the optical fiber connector) dispose.
As shown in Figure 2, this switching circuit 90 further comprises: a transistor 91 and a switching diode (pin diode) 92.Wherein, this transistor 91 is for example and without limitation to a NPN transistor, and its first end is coupled to this control signal CNTL, the second end is coupled to the anode of this switching diode, and the 3rd end then is coupled to+the 5V power supply, wherein, this first end is base stage, and first end is emitter-base bandgap grading, and the 3rd end is collector.Wherein, this switching diode 92 is comprised of two co-anode diodes, its anode 920 is coupled to the second end of this transistor 91 via a coil (figure does not indicate), 921 on first negative electrode of this diode 92 is coupled to the A point among this Fig. 1, and 922 on first negative electrode of this diode 92 is coupled to the B point among this Fig. 1.
When the control signal of these comparator 80 outputs is high potential, the base of this NPN transistor 91 (B)-the penetrate voltage＞0.7V of (E) interpolar, therefore, this transistor 91 is with conducting, simultaneously also forward conducting of this switching diode 92, make this radiofrequency signal export this second connector 100 to via the first negative electrode 921 of this transistor 91 and switching diode 92, and finish the program of uploading.
When the control signal of these comparator 80 outputs is electronegative potential, the base of this NPN transistor 91 (B)-the penetrate voltage＜0.7V of (E) interpolar, therefore, this transistor 91 will end, this switching diode 92 also ends simultaneously, make this radiofrequency signal can't export this second connector 100 to, enter in this cable with noise isolation.
As shown in Figure 3, in addition, distribution amplifier with noise suppression circuit of the present utility model further has a printed circuit board (PCB) 110 to carry the elements such as this first connector 10, the first filter 20, transformer 30, voltage level control unit 40, the first amplifier 50, detector 60, the second amplifier 70, comparator 80, switching circuit 90 and the second connector 100, it is prior art, and non-emphasis of the present utility model, so do not intend repeating to give unnecessary details at this.
Referring again to Fig. 1 and Fig. 2, distribution amplifier with noise suppression circuit of the present utility model further has one first switch 25 and a second switch 95, wherein, this first switch 25 places on this printed circuit board (PCB) 110 and between the first siding ring 31 of this first filter 20 and this transformer 30, its first end (i.e. common end) is coupled to the output of this first filter 20, the second end is coupled to the first end of this first siding ring 31, in order to this radiofrequency signal of control output to this transformer 30 whether; This second switch 95 places on this printed circuit board (PCB) 110 and between this first switch 25, switching circuit 90 and this second connector 100, its first end (i.e. common end) is coupled to the input of this second filter 100, the second end (being the A point among Fig. 1) is coupled to the first negative electrode 921 of this switching diode 92, the 3rd end then is coupled to the 3rd end of this first switch 25, in order to this radiofrequency signal of control output to this second connector 100 whether, wherein this first switch 25 and this second switch 95 are for example and without limitation to an electronic switch.
In addition, distribution amplifier with noise suppression circuit of the present utility model further has one second filter 35, it places on this printed circuit board (PCB) 110 and between this transformer 30 and this voltage level control unit 40, can carry out filtering to the radiofrequency signal that this transformer 30 is coupled, and this second filter 35 also is a band pass filter, can further carry out the bandpass filtering of 5MHz-42MHz to the output radiofrequency signal of this transformer 30, to strengthen its filter effect.
In addition, distribution amplifier with noise suppression circuit of the present utility model further has an attenuator 55, place between this first amplifier 50 and this detector 60, its first end is coupled to the output of this first amplifier 50, can carry out decay to this radiofrequency signal.Wherein, this attenuator 55 is for example and without limitation to a resistor.
In addition, distribution amplifier with noise suppression circuit of the present utility model further has one the 3rd amplifier 56, place between this attenuator 55 and this detector 60, its first end is coupled to the output of this attenuator 55, its output then is coupled to the first end of this detector 60, can again carry out voltage amplification to this radiofrequency signal, wherein, the 3rd amplifier is for example and without limitation to a transistor circuit, can carry out to the radiofrequency signal of these attenuator 55 outputs the voltage amplification of about 20dB.
Please refer to table one, it shows the voltage level (input level) of input radio frequency signal, the voltage level of detector 60 outputs and the relation table that this second amplifier 70 is exported the voltage level (being test point) of radiofrequency signals.
Table one
For example, when the voltage level of input radio frequency signal is 34dBmV, the voltage level of detector 60 outputs is 0.18V, the voltage level of these the second amplifier 70 output radiofrequency signals is 1.47V, less than the reference voltage (Vref) of 1.5V, therefore, the control signal of this comparator 80 is output as electronegative potential, this transistor 91 and this switching diode 92 will end, and make this radiofrequency signal can't export this second connector 100 to, enter in this cable with noise isolation.
When the voltage level of input radio frequency signal is 35dBmV, the voltage level of detector 60 outputs is 0.21V, the voltage level of these the second amplifier 70 output radiofrequency signals is 1.67V, reference voltage (Vref) greater than 1.5V, therefore, the control signal of this comparator 80 is output as high potential, and this transistor 91 and this switching diode 92 make this radiofrequency signal export this second connector 100 to via this first switch 25 and second switch 95 conducting.
Therefore, the engineering staff can be according to the signal of cable/noise ratio (S/N), via the resistance value of adjusting this voltage level control unit 47, control the voltage level of this test point, determine according to this whether to allow and upload radiofrequency signal and enter in this cable, its error amount such as but not limited to about+/-3dB.When signal/when noise ratio (S/N) is good, but the distribution amplifier with noise suppression circuit of the present utility model really noise insulation enter in the cable; But when the signal of cable/when noise ratio is very poor, even if improve the voltage level of test point, still has noise and then to upload radiofrequency signal and enter in the cable.In addition, the distribution amplifier with noise suppression circuit of the present utility model further has one first power regulator 120 and a second source pressurizer 130.Wherein, the first end of this first power regulator 120 is coupled to one first DC power supply, and the second end is then exported one second DC power supply, and wherein, this second DC power supply may be output to this first switch 25 and second switch 95, and its required DC power supply is provided.
The first end of this second source pressurizer 130 is coupled to this second DC power supply, the second end is then exported one the 3rd DC power supply, the 3rd DC power supply may be output to this first amplifier 50, the second amplifier 70, the 3rd amplifier 56 and comparator 80, and its required DC power supply is provided.
Wherein, this first DC power supply is for example and without limitation to DC+12V, and this second DC power supply is for example and without limitation to DC+9V, and the 3rd DC power supply is for example and without limitation to DC+5V.
When running, after if the radiofrequency signal that this first connector 10 is wanted to upload is amplified via this second amplifier 70, and the voltage of this test point is higher than this reference voltage (Vref), then this comparator 80 will be exported the control signal CNTL of high potential, this transistor 91 and this switching diode 92 are with conducting, make this radiofrequency signal export this second connector 100 to via this first switch 25 and second switch 95, therefore, radiofrequency signal can be uploaded in this cable; After if the radiofrequency signal that this first connector 10 is wanted to upload is amplified via this second amplifier 70, but the voltage of this test point is lower than this reference voltage (Vref), then this comparator 80 will be exported the control signal CNTL of electronegative potential, this transistor 91 and this switching diode 92 will end, make this radiofrequency signal can't export this second connector 100 to, therefore, radiofrequency signal can't be uploaded in this cable via this first switch 25 and second switch 95, also can intercept noise simultaneously and enter in this cable.Therefore, the distributor with distributor prior art of noise suppression circuit of the present utility model has the advantage that enters cable uploading and do not upload Shi Jieke obstruct noise.In addition, the distributor with noise suppression circuit of the present utility model its can be widely used in the master/passive type distribution amplifier.
As shown in Figure 4, in addition, the distribution amplifier with noise suppression circuit of the present utility model further has a housing 150, with elements such as accommodating this printed circuit board (PCB) 110, the first connector 10 and the second connectors 100.This housing 150 is such as but not limited to made by plastic material.
Therefore, the distribution amplifier with noise suppression circuit of the present utility model can have simultaneously and intercepts noise and enter cable and the function of power supply for other distributor, coupler or amplifier is provided.
In sum, by the enforcement with distribution amplifier of noise suppression circuit of the present utility model, it has a detector and amplifier, can detect whether to upload radiofrequency signal and will enter in the cable; It has a comparator and a switching circuit, can be unlocked during greater than a reference potential in this level of uploading radiofrequency signal, to enter in the cable so that this uploads radiofrequency signal, and close this switching circuit in uploading when finishing, enter in the cable thoroughly to prevent noise; And it can be widely used in the medium advantage of master/passive type distribution amplifier, and therefore, the really more existing distributor of the utility model, coupler or amplifier have progressive.
The utility model discloses, and is preferred embodiment, and patent right category of the present utility model is not all taken off in such as local change or modification and come from technological thought of the present utility model and be easy to the person of knowing by inference by the people who is familiar with this skill.
Claims (11)
1. the distribution amplifier with noise suppression circuit is characterized in that, comprising:
One first connector is in order to input a radiofrequency signal;
One first filter is coupled to this first connector, can carry out filtering to this radiofrequency signal;
One transformer, it has one lateral coils and a second siding ring, and wherein the first end of this first siding ring is coupled to the output of this first filter, this radiofrequency signal can be coupled to this second siding ring;
One voltage level control unit, its first end is coupled to the first end of the second siding ring of this transformer, in order to adjust the voltage level of this radiofrequency signal;
One first amplifier, its first end are coupled to the second end of this voltage level control unit, can carry out voltage amplification to this radiofrequency signal;
One detector, its first end is coupled to the output of this first amplifier, can detect this radiofrequency signal;
One second amplifier is coupled to the output of this detector, can again carry out voltage amplification to this radiofrequency signal;
One comparator, it has a first input end and one second input, and this first input end is coupled to a reference voltage, and this second input then is coupled to the output of this second amplifier, can export a control signal;
One switching circuit, its first end are coupled to the second end of the first siding ring of this transformer, and the second end then is coupled to the control signal of this comparator, can be closed or open according to this control signal, whether to determine this radiofrequency signal of output; And
One second connector is coupled to the 3rd end of this switching circuit, in order to export this radiofrequency signal.
2. the distributor with noise suppression circuit as claimed in claim 1, it is characterized in that, this first connector and the second connector are optical fiber connector or RJ-45 connector, the frequency of this radiofrequency signal is 5MHz-42MHz, and this first filter is a band pass filter, and this voltage level control unit is a variable resistance.
3. the distribution amplifier with noise suppression circuit as claimed in claim 1, it is characterized in that, further has one first switch, place between this first filter and this transformer, its first end is coupled to the output of this first filter, the second end is coupled to the first end of the first siding ring of this transformer, whether can determine this radiofrequency signal of output, and wherein this first switch is an electronic switch.
4. the distribution amplifier with noise suppression circuit as claimed in claim 3, it is characterized in that, further has one second filter, place between this transformer and this voltage level control unit, its first end is coupled to the first end of the second siding ring of this transformer, the second end is coupled to the first end of this voltage level control unit, can carry out filtering to the radiofrequency signal that this transformer is coupled, and this second filter is a band pass filter.
5. the distribution amplifier with noise suppression circuit as claimed in claim 4, it is characterized in that, further has an attenuator, place between this first amplifier and this detector, its first end is coupled to the output of this first amplifier, and its second end is coupled to the first end of this detector, can carry out decay to this radiofrequency signal, wherein, this detector is a diode, and this attenuator is a resistor.
6. the distribution amplifier with noise suppression circuit as claimed in claim 5, it is characterized in that, further has one the 3rd amplifier, place between this attenuator and this detector, its first end is coupled to the output of this attenuator, and its output then is coupled to the first end of this detector, can again carry out voltage amplification to this radiofrequency signal, wherein, this first amplifier and the 3rd amplifier are a transistor circuit, and this second amplifier is an operational amplifier.
7. the distribution amplifier with noise suppression circuit as claimed in claim 6, it is characterized in that further printed circuit board (PCB) is to carry this first connector, the first filter, the first switch, transformer, the first amplifier, attenuator, the second amplifier, detector, the 3rd amplifier, comparator, switching circuit and this second connector.
8. the distribution amplifier with noise suppression circuit as claimed in claim 7, it is characterized in that, further has a second switch, place on this printed circuit board (PCB) and between this first switch, switching circuit and this second connector, in order to this radiofrequency signal of control output to this second connector whether, wherein this second switch also is an electronic switch.
9. the distribution amplifier with noise suppression circuit as claimed in claim 8 is characterized in that further having:
One first power regulator, its first end are coupled to one first DC power supply, and the second end is then exported one second DC power supply, and this second DC power supply may be output to this first switch and second switch, and its required DC power supply is provided; And
One second source pressurizer, its first end is coupled to this second DC power supply, the second end is then exported one the 3rd DC power supply, and the 3rd DC power supply may be output to this first amplifier, the second amplifier, the 3rd amplifier and comparator, and its required DC power supply is provided.
10. the distribution amplifier with noise suppression circuit as claimed in claim 9 is characterized in that, this first DC power supply is DC+12V, and this second DC power supply is DC+9V, and the 3rd DC power supply is DC+5V.
11. the distribution amplifier with noise suppression circuit as claimed in claim 9 is characterized in that, further has a housing, with accommodating this printed circuit board (PCB), the first connector and the second connector, and this housing is made by plastic material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220291191 CN202679315U (en) | 2012-06-20 | 2012-06-20 | Distribution amplifier provided with noise suppression circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220291191 CN202679315U (en) | 2012-06-20 | 2012-06-20 | Distribution amplifier provided with noise suppression circuit |
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|---|---|
| CN202679315U true CN202679315U (en) | 2013-01-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220291191 Expired - Fee Related CN202679315U (en) | 2012-06-20 | 2012-06-20 | Distribution amplifier provided with noise suppression circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107430420A (en) * | 2015-06-19 | 2017-12-01 | 赛普拉斯半导体公司 | The low-power TYPE C receivers suppressed with high idle noise and DC level |
| CN108377354A (en) * | 2018-01-04 | 2018-08-07 | 杭州万隆光电设备股份有限公司 | A kind of cable television system Noise Suppression Device |
-
2012
- 2012-06-20 CN CN 201220291191 patent/CN202679315U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107430420A (en) * | 2015-06-19 | 2017-12-01 | 赛普拉斯半导体公司 | The low-power TYPE C receivers suppressed with high idle noise and DC level |
| US10191524B2 (en) | 2015-06-19 | 2019-01-29 | Cypress Semiconductor Corporation | Low-power Type-C receiver with high idle noise and DC-level rejection |
| US10890957B2 (en) | 2015-06-19 | 2021-01-12 | Cypress Semiconductor Corporation | Low-power type-C receiver with high idle noise and DC-level rejection |
| CN108377354A (en) * | 2018-01-04 | 2018-08-07 | 杭州万隆光电设备股份有限公司 | A kind of cable television system Noise Suppression Device |
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