CN109819299A - A kind of high-pass filtering circuit and high-pass filter - Google Patents
A kind of high-pass filtering circuit and high-pass filter Download PDFInfo
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- CN109819299A CN109819299A CN201711181324.XA CN201711181324A CN109819299A CN 109819299 A CN109819299 A CN 109819299A CN 201711181324 A CN201711181324 A CN 201711181324A CN 109819299 A CN109819299 A CN 109819299A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/21—Circuitry for suppressing or minimising disturbance, e.g. moiré or halo
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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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Abstract
The embodiment of the present application provides a kind of high-pass filtering circuit and high-pass filter, applied in digital cable TV broadcast system, high-pass filtering circuit includes input terminal, at least one first filter unit, at least one trap wave unit and output end, at least one first filter unit is connected between input terminal and output end, the trap input terminal of trap wave unit and the filtering output end of the first filter unit are electrically connected, the trap output end of trap wave unit is grounded, high-pass filtering circuit further includes that at least one adjusts unit, adjusting unit includes the control signal for receiving control signal, the reference end of ground connection and the control output end being connected with trap wave unit, it adjusts unit and controls to adjust whether unit accesses trap wave unit according to control signal, to control to adjust the resonant parameter whether unit changes trap wave unit.The embodiment of the present application also provides a kind of receiving terminal for digital television.Using the embodiment of the present application, the demand of different operating frequency band can satisfy.
Description
Technical field
This application involves set-top box technique field more particularly to a kind of high pass filter unit and high-pass filters.
Background technique
With universal (such as digital television etc.) of digital video playback terminal and the continuous promotion of network bandwidth, number
Word cable tv broadcast system (digital video broadcasting-cable, DVB-C) set-top box is widely used in
Digital video play-back technology field, to meet the needs of user watches video program.Most of DVB-C set-top box uses cable tune
Modulator-demodulator (cable modem, CM) accesses network.CM uses frequency multiplexing technique, data over cable service interface specification
For different regions in (data over cable service interface specifications, DOCSIS) standard
Uplink/downlink band plan is different, such as the upstream band of DOCSIS1.0/2.0 planning north America region is 5~42MHz, downlink
Frequency band is 54~1002MHz, and the upstream band of European Region is 5~65MHz, and downstream bands are 108~1002MHz.Upper line frequency
Band is easy to be mixed into set-top box radio frequency (radio frequency, RF) reception system progress level-one low-noise amplifier (low
Noise amplifier, LNA) amplification, spuious and harmonic wave, intermodulation, which act on, to be easy to interfere the useful frequency range of DVB-C,
Cause the indexs such as sensitivity, intermodulation to decline, deteriorate signal-to-noise ratio, mosaic phenomenon occur under weak signal, influences video output matter
Amount.
For this purpose, DVB-C set-top box radio-frequency front-end generally is configured with the high pass filter unit (high for filtering out upstream band
Pass filter, HPF).Due to underfrequency, intermediate zone is narrow, generallys use the carrying of lumped parameter inductance capacitance discrete component
Oval high-order high pass filter unit device complete.But for different DOCSIS standards, different regions (country), different operations
Quotient, different channels (channel) need to design different high-pass filters since working frequency section is different.
It is that technology urgently to be resolved is asked that a kind of high pass filter unit, which how to be designed, to meet the needs of different operating frequency band
Topic.
Summary of the invention
The embodiment of the present application technical problem to be solved is, provides a kind of high-pass filtering circuit and high-pass filter,
It can satisfy the demand of different operating frequency band.
The embodiment of the present application first aspect provides a kind of high-pass filtering circuit, which is applied to digital cable
In television broadcasting system, which includes input terminal, at least one first filter unit, at least one trap wave unit
And output end, it connects between at least one first filter unit, the filter input of at least one the first filter unit and input
End is electrically connected, and the filtering output end and output end of at least one the first filter unit are electrically connected, and the trap of trap wave unit is defeated
Enter end and the filtering output end of the first filter unit is electrically connected, the trap output end ground connection of trap wave unit, high-pass filtering circuit
It further include that at least one adjusts unit；
Adjusting unit includes control signal, reference end and control output end, and control signal receives control signal, reference
End ground connection, control output end is connected with trap wave unit；
It adjusts unit and controls to adjust whether unit accesses trap wave unit according to control signal, to control to adjust whether unit changes
Become the resonant parameter of trap wave unit.
The embodiment of the present application first aspect by high-pass filtering circuit increase adjust unit so that adjust unit according to
Control signal controls whether to change the resonant parameter of trap wave unit, to control whether that the filtering for changing high-pass filtering circuit is joined
Number can satisfy the demand of different operating frequency band so that high-pass filtering circuit has flexibility.
In a kind of mode in the cards, unit is adjusted according to control signal and controls to adjust whether unit accesses trap list
The process of member are as follows: if control signal is Continuity signal, unit access trap wave unit is adjusted, to change the resonance ginseng of trap wave unit
Number；If control signal is cut-off signal, adjusts unit and do not access trap wave unit, to keep the resonant parameter of trap wave unit；Its
In, Continuity signal is opposite with the level of cut-off signal.It is controlled by the way that whether control signal control and regulation unit accesses trap wave unit
Whether system changes the resonant parameter of trap wave unit.
In a kind of mode in the cards, adjusting unit includes partial pressure unit, switch unit and the second filter unit, is divided
The partial pressure input terminal of unit is pressed to receive control signal, the switch input terminal and the of the partial pressure output termination switch unit of partial pressure unit
The filter input of two filter units, switch unit output switching terminal ground connection, the filtering output end of the second filter unit and fall into
Wave unit is connected.
In a kind of mode in the cards, if control signal is Continuity signal, switching means conductive, the second filtering list
The filtering output end and trap wave unit of member are electrically connected, and the second filter unit accesses trap wave unit with parallel way.
In a kind of mode in the cards, trap wave unit includes concatenated inductance and capacitor；The inductance input terminal of inductance
It is electrically connected with the filtering output end of the first filter unit, the inductance output end of inductance and the capacitor input terminal of capacitor electrically connect
It connects, the capacitor output end ground connection of capacitor；Or, the capacitor input terminal of capacitor and the filtering output end of the first filter unit electrically connect
It connects, the capacitor output end of capacitor and the inductance input terminal of inductance are electrically connected, the inductance output end ground connection of inductance.
In a kind of mode in the cards, if the filtering output end of the inductance input terminal of inductance and the first filter unit is electric
Property connection, then the capacitor input terminal of the filtering output end of the second filter unit and capacitor be electrically connected, the second filter unit and electricity
Hold in parallel；If the capacitor input terminal of capacitor and the filtering output end of the first filter unit are electrically connected, the second filter unit
The inductance input terminal of filtering output end and inductance is electrically connected, the second filter unit and inductance in parallel.
Wherein, above-mentioned first filter unit is capacitor；Above-mentioned second filter unit be inductively or capacitively, it can be achieved that capacitor with
The capacitor for adjusting unit is in parallel, capacitor with adjust the inductance in parallel of unit, inductance with the adjusting capacitor of unit in parallel and inductance and
Adjust the inductance in parallel of unit.
Wherein, above-mentioned switch unit be Schottky diode, have one-way conduction characteristic, with control the second filter unit with
Parallel way accesses trap wave unit.
Wherein, above-mentioned control signal is inputted by the I/O port of processor.
The embodiment of the present application second aspect provides a kind of high-pass filter, which is applied to digital cable TV
In broadcast system, the high-pass filtering circuit including first aspect offer.
The embodiment of the present application third aspect provides a kind of receiving terminal for digital television, which is applied to
In digital cable TV broadcast system, including processor, input interface, output interface, memory and high-pass filter, the high pass
Filter includes the high-pass filtering circuit that first aspect provides.
Detailed description of the invention
Technical solution in ord to more clearly illustrate embodiments of the present application or in background technique below will be implemented the application
Attached drawing needed in example or background technique is illustrated.
Fig. 1 a is a kind of high-pass filtering circuit applied at present；
Fig. 1 b is another high-pass filtering circuit applied at present；
Fig. 2 is a kind of circuit block diagram of high-pass filtering circuit provided by the embodiments of the present application；
Fig. 3 is a kind of particular circuit configurations schematic diagram of high-pass filtering circuit provided by the embodiments of the present application；
Fig. 4 is the particular circuit configurations schematic diagram of another high-pass filtering circuit provided by the embodiments of the present application；
Fig. 5 a is that the positive transmission coefficient based on circuit diagram shown in Fig. 3 emulates schematic diagram 1；
Fig. 5 b is that the input reflection coefficient based on circuit diagram shown in Fig. 3 emulates schematic diagram 1；
Fig. 6 a is that the positive transmission coefficient based on circuit diagram shown in Fig. 3 emulates schematic diagram 2；
Fig. 6 b is that the input reflection coefficient based on circuit diagram shown in Fig. 3 emulates schematic diagram 2；
Fig. 7 a- Fig. 7 f is the test emulation schematic diagram of drawing a design of the high-pass filtering circuit based on the embodiment of the present application；
Fig. 8 is a kind of structural schematic diagram of receiving terminal for digital television provided by the embodiments of the present application.
Specific embodiment
Currently, the high-pass filter in digital television broadcasting system is applied, for different DOCSIS standards, different regions
The design of (country), different operators or different channels (channel), high-pass filtering circuit is different.It can be found in Fig. 1 a and Fig. 1 b,
The two kinds of high-pass filtering circuits respectively applied at present.
High-pass filtering circuit shown in Fig. 1 a is seven rank ellipse high-pass filtering circuits, and there are three tools, and trap wave point is adjustable, right
DOCSIS 1.0/2.0/3.0 standard is answered, Europe DVB-C most area is suitable for, corresponding high-pass filter index is
The band connection frequency of 108MHz~1002MHz, the pass band damping less than 3dB, input reflection coefficient greater than 9dB, 5~65MHz
Stop-band frequency and stopband attenuation greater than 35dB.
High-pass filtering circuit shown in Fig. 1 b is nine rank ellipse high-pass filtering circuits, and there are four tools, and trap wave point is adjustable, right
Answer 2.0 standard of DOCSIS, be suitable for some areas North America DVB-C, corresponding high-pass filter index be 54MHz~
The stop-band frequency of the band connection frequency of 1002MHz, the pass band damping less than 3dB, the input reflection coefficient greater than 9dB, 5~32MHz
With the stopband attenuation for being greater than 35dB.
The corresponding working frequency section of Fig. 1 a and Fig. 1 b is different, and high-pass filtering circuit is also different, and filtering parameter is also
It is different.Since different operating frequency band needs to configure different filter parameters, result in the need for for different working frequency sections
Different high-pass filtering circuits is configured, that is, needs to configure different component hardware configurations.
In consideration of it, the embodiment of the present application provides a kind of high-pass filtering circuit and high-pass filter, different operating can satisfy
The demand of frequency band.Correspondingly, the embodiment of the present application also provides a kind of receiving terminal for digital television, can be and digit television broadcasting
Terminal (such as television set) independent set-top box is put, is also possible to for set-top box to be integrated in the terminal that DTV plays terminal.
It should be noted that high-pass filtering circuit provided by the embodiments of the present application, high-pass filter and receiving terminal for digital television, are answered
For in digital cable TV broadcast system (DVB-C).
Fig. 2 is referred to, is a kind of circuit block diagram of high-pass filtering circuit provided by the embodiments of the present application, including input terminal
(IN), two the first filter units (11 and 12), two trap wave units (21 and 22), two adjusting units (31 and 32) and output
It holds (OUT).It should be noted that Fig. 2 is carried out by taking two the first filter units, two adjusting units and two trap wave units as an example
It introduces, does not constitute the restriction to the embodiment of the present application, in practical application, the first filter unit adjusts unit and trap wave unit
Quantity may be for 1 or 3 or 4 or more.But, the quantity for adjusting unit is identical as the quantity of trap wave unit, and one
A resonant parameter for adjusting unit and being used to adjust a corresponding trap wave unit, the quantity of the first filter unit can be greater than or wait
In the quantity of trap wave unit.
Wherein, input terminal shown in Fig. 2 is rf inputs, for connecing wire signal.Output end shown in Fig. 2 is radio frequency
Output end connects DTV by coaxial wire and plays terminating plug, is inserted in DTV and plays the tuner of terminal i.e.
Antenna input jack, can be by automatic search, to choose the output signal of receiving terminal for digital television.
Wherein, the first filter unit 11 is connected with the first filter unit 12, the filter input 111 of the first filter unit 11
It is electrically connected with input terminal, the filter input 121 of the filtering output end 112 of the first filter unit 11 and the first filter unit 12
It is electrically connected, the filtering output end 122 and output end of the first filter unit 12 are electrically connected.
More than two first filter units if it exists, then the filter input of concatenated first the first filter unit with
Input terminal is electrically connected, and the filtering output end and output end of the last one concatenated the first filter unit are electrically connected.
The filtering output end of first filter unit 11 is also electrically connected with the trap input terminal of trap wave unit 21, trap wave unit
21 trap output end ground connection.The filtering output end of first filter unit 12 also electrically connects with the trap input terminal of trap wave unit 22
It connects, the trap output end ground connection of trap wave unit 22.
Further, trap wave unit 21 includes concatenated inductance and capacitor.In one implementation, the first filter unit
The inductance input terminal of 11 filtering output end and the inductance of trap wave unit 21 is electrically connected, and the inductance of the inductance of trap wave unit 21 is defeated
The capacitor input terminal of the capacitor of outlet and trap wave unit 21 is electrically connected, the capacitor output end ground connection of the capacitor of trap wave unit 21.
In another implementation, the capacitor input terminal electricity of the capacitor of the filtering output end and trap wave unit 21 of the first filter unit 11
Property connection, the inductance input terminal of the inductance of the capacitor output end and trap wave unit 21 of the capacitor of trap wave unit 21 is electrically connected, sunken
The inductance output end of the inductance of wave unit 21 is grounded.
It should be noted that the inductance of each trap wave unit can be identical with the series system of capacitor, i.e., unified electricity
The inductance output end of sense and the capacitor input terminal of capacitor are electrically connected, and the capacitor output end ground connection of capacitor or the capacitor of capacitor are defeated
The inductance input terminal of outlet and inductance is electrically connected, the inductance output end ground connection of inductance, can also be not exactly the same.Each trap
The inductance of unit and the component parameter of capacitor are not construed as limiting in the embodiment of the present application, such as the inductance of trap wave unit 21 is
220 nanohenrys (nH), the capacitor of trap wave unit 21 are 220 pico farads (pF), and the inductance of trap wave unit 22 is 150nH, trap wave unit 22
Capacitor be 120pF.
Wherein, adjusting unit 31 includes control signal 311, reference end 313 and control output end 312, control signal
311 receive control signal, and reference end 313 is grounded, and control output end 312 is connected with trap wave unit 21.Adjusting unit 32 includes control
Input terminal 321, reference end 323 and control output end 322 processed, control signal 321 receive control signal, and reference end 323 is grounded,
Control output end 322 is connected with trap wave unit 21.It should be noted that the control output end for adjusting unit is electric in some cases
Property connect its corresponding trap wave unit, corresponding trap wave unit disconnects in some cases.
It is sunken whether the control signal control and regulation unit 31 that adjusting unit 31 is received according to its control signal 311 accesses
Wave unit 21, to control to adjust the resonant parameter whether unit 31 changes trap wave unit 21.It is defeated according to its control to adjust unit 32
Enter the control signal that end 321 receives and control to adjust whether unit 32 accesses trap wave unit 22, whether to control to adjust unit 32
Change the resonant parameter of trap wave unit 22.Wherein, resonant parameter may include resonance frequency.
If the control signal that the control signal 311 for adjusting unit 31 receives is Continuity signal, adjusts unit 31 and connect
Enter trap wave unit 21, to change the resonant parameter of trap wave unit 21.It is understood that adjusting the control output of unit 31 at this time
End 312 is electrically connected with trap wave unit 21, thus it is possible to vary the resonant parameter of trap wave unit 21.
If the control signal that the control signal 311 for adjusting unit 31 receives is cut-off signal, unit 31 is adjusted not
Trap wave unit 21 is accessed, to keep the resonant parameter of trap wave unit 21.It is understood that the control for adjusting unit 31 at this time is defeated
Outlet 312 and trap wave unit 21 disconnect, and do not change the resonant parameter of trap wave unit 21.
On the contrary, for example, Continuity signal is high level signal, cut-off signal is the level of above-mentioned Continuity signal and cut-off signal
Low level signal.Continuity signal and cut-off signal by processor I/O port (general purpose input
Output, GPIO) input, i.e. the GPIO electric connection of the CPU of the control signal and receiving terminal for digital television of adjusting unit.
Further, adjusting unit 31 includes partial pressure unit, switch unit and the second filter unit.Wherein, partial pressure unit
For resistance, each resistance for adjusting unit is not construed as limiting in the embodiment of the present application.Switch unit is diode, specifically may be used
Think Schottky diode, can also be other diodes.Schottky diode belongs to a kind of low-power consumption, Speed Semiconductor device
Part, reverse recovery time short feature small with forward conduction voltage drop.
If the control signal that the control signal 311 for adjusting unit 31 receives is Continuity signal, unit 31 is adjusted
Switching means conductive, the filtering output end and trap wave unit 21 for adjusting the second filter unit of unit 31 are electrically connected, adjust single
Second filter unit of member 31 accesses trap wave unit 21 with parallel way.
If the inductance input terminal of the inductance of the filtering output end of the first filter unit 11 and trap wave unit 21 is electrically connected,
The capacitor input terminal of the filtering output end and trap wave unit 21 that adjust the second filter unit of unit 31 is electrically connected, i.e. trap list
The inductance output end of the inductance of member 21 and the capacitor input terminal of trap wave unit 21 are electrically connected, the also filtering with the second filter unit
Output end is electrically connected.At this point, the switching means conductive of unit 31 and ground connection are adjusted, then the second filtering for adjusting unit 31 is single
Member is in parallel with the capacitor of trap wave unit 21.
If the capacitor input terminal of the capacitor of the filtering output end of the first filter unit 11 and trap wave unit 21 is electrically connected,
The inductance input terminal of the filtering output end and trap wave unit 21 that adjust the second filter unit of unit 31 is electrically connected, i.e. trap list
The inductance output end of the capacitor of member 21 and the inductance input terminal of trap wave unit 21 are electrically connected, the also filtering with the second filter unit
Output end is electrically connected.At this point, the switching means conductive of unit 31 and ground connection are adjusted, then the second filtering for adjusting unit 31 is single
The inductance in parallel of member and trap wave unit 21.
Adjusting the second filter unit that unit includes can be inductance, be also possible to capacitor, then in the control for adjusting unit
In the case that input terminal processed receives Continuity signal, it may be possible to the inductance of unit and the inductance in parallel of trap wave unit are adjusted, it may
Be adjust unit inductance it is in parallel with the capacitor of trap wave unit, it may be possible to the inductance of the capacitor and trap wave unit that adjust unit is simultaneously
Connection, it may be possible to which the capacitor for adjusting unit is in parallel with the capacitor of trap wave unit, and then changes the resonant parameter of trap wave unit.
In circuit block diagram shown in Fig. 2, unit is adjusted by increasing in high-pass filtering circuit, unit is adjusted and passes through control
Whether signal controllable adjustable unit processed accesses trap wave unit, to control whether to change the resonant parameter of trap wave unit, due to each
A trap but resonant parameter can be changed by corresponding adjusting unit so that high-pass filtering circuit have it is flexible
Property, so that flexible high-pass filtering circuit can satisfy the demand of different operating frequency band.It does not need for different work frequencies
Rate section formulates different high-pass filtering circuits, using high-pass filtering circuit provided by the embodiments of the present application, need to only adjust each tune
The control signal of section unit can meet the needs of different operating frequency band.
Fig. 3 is referred to, is a kind of particular circuit configurations schematic diagram of high-pass filtering circuit provided by the embodiments of the present application, packet
Include input terminal (IN), five the first filter units (11,12,13,14 and 15), four trap wave units (21,22,23 and 24), four
A adjusting unit (31,32,33 and 34) and output end (OUT).It should be noted that Fig. 3 is with five the first filter units, four
It is introduced for adjusting unit and four trap wave units, does not constitute the restriction to the embodiment of the present application.
Wherein, the first filter unit 11 is the capacitor C1 in Fig. 3, and capacitance can be 56pF；First filter unit 12
Capacitor C4 in as Fig. 3, capacitance can be 22pF；First filter unit 13 is the capacitor C7 in Fig. 3, and capacitance can
For 22pF；First filter unit 14 is the capacitor C10 in Fig. 3, and capacitance can be 22pF；First filter unit 15 is to scheme
Capacitor C13 in 3, capacitance can be 47pF.
Wherein, trap wave unit 21 is the series arm of the inductance L1 and capacitor C3 composition in Fig. 3, the capacitor output end of C3
Ground connection, the inductance value of L1 are 220nH, and the capacitance of C3 is 220pF；Trap wave unit 22 is inductance L2 and capacitor C6 in Fig. 3
The series arm of composition, the capacitor output end ground connection of C6, the inductance value of L2 are 150nH, and the capacitance of C6 is 120pF；Trap list
Member 23 is the series arm of the inductance L3 and capacitor C9 composition in Fig. 3, and the capacitor output end of C9 is grounded, and the inductance value of L3 is
The capacitance of 220nH, C9 are 27pF；Trap wave unit 24 is the series arm of the inductance L4 and capacitor C12 composition in Fig. 3, C12
Capacitor output end ground connection, the inductance value of L4 is 150nH, and the capacitance of C9 is 43pF.
Wherein, adjusting resistance value of the unit 31 including resistance R1, Schottky diode D1 and capacitor C2, R1 is the Europe 10k (Ω),
The capacitance of C2 is 120pF；Adjusting resistance value of the unit 32 including resistance R2, Schottky diode D2 and capacitor C5, R2 is 10k
The capacitance of Ω, C5 are 150pF；Adjusting resistance value of the unit 33 including resistance R3, Schottky diode D3 and capacitor C8, R3 is
The capacitance of 10k Ω, C8 are 43pF；Adjust the resistance value that unit 34 includes resistance R4, Schottky diode D4 and capacitor C11, R4
For 10k Ω, the capacitance of C11 is 270pF.
It should be noted that C2, C5, C8 and C11 correspond to the second filter unit, filtered singly with capacitor for second in Fig. 3
It is introduced for member, at least one of C2, C5, C8 and C11 can change inductance into practice.
When GPIO1 is high level signal, i.e. when the control signal of adjusting unit 31 receives high level signal, Xiao Te
Based diode D1 forward conduction, C2 is electrically connected access trap wave unit 21, in parallel with C3.At C2 and the unshunted situation of C3,
The resonant parameter of trap wave unit 21 is determined by the inductance value of L1 and the capacitance of C3, in the case where C2 is in parallel with C3, trap list
The inductance value of capacitance and L1 of the resonant parameter of member 21 by C2 after in parallel with C3 determines.
When GPIO1 is low level signal, i.e. when the control signal of adjusting unit 31 receives low level signal, Xiao Te
Based diode D1 forward direction is not turned on, and the branch where being equivalent to D1 disconnects, then C2 can not be electrically connected access trap wave unit 21,
The resonant parameter of trap wave unit 21 still determines by the capacitance of the inductance value of L1 and C3, i.e., the resonant parameter of trap wave unit 21 is not
It changes.
GPIO2, GPIO3 and GPIO4 are identical as the control principle of above-mentioned GPIO1, and details are not described herein.
By the high level signal and low level signal of GPIO1, GPIO2, GPIO3 and GPIO4, can be controlled separately C2 is
No, C5 in parallel with C3 whether, C8 in parallel with C6 whether and C11 in parallel with C9 in parallel with C12, to control whether to change
The resonant parameter of corresponding trap wave unit can satisfy different operating frequency so that high-pass filtering circuit has flexibility
The demand of section.
In physical circuit figure shown in Fig. 3, trap wave unit is the inductance output end of inductance and the capacitor input terminal of capacitor
It is electrically connected, the capacitor output end ground connection of capacitor.In practical application, trap wave unit can also be the capacitor output end and electricity of capacitor
The inductance input terminal of sense is electrically connected, the capacitor output end ground connection of capacitor.It can be found in Fig. 4, be provided by the embodiments of the present application another
A kind of particular circuit configurations schematic diagram of high-pass filtering circuit.With Fig. 3 the difference is that, in Fig. 4 the capacitor output end of C6 with
The inductance input terminal of L2 is electrically connected, and the capacitor output end of C12 and the inductance input terminal of L4 are electrically connected.But Fig. 3 and Fig. 4
It can achieve the effect for meeting the needs of different operating frequency band.
It is understood that Fig. 3 and physical circuit figure shown in Fig. 4 are nine rank high-pass filtering circuits, the embodiment of the present application
In do not limit the order of high-pass filtering circuit.
GPIO1, GPIO2, GPIO3 and GPIO4 can be corresponded to C2, C5, C8 and C11 selectively access by binary combination
Trap wave unit, following table be control logic sample table.
As seen from the above table, the binary combination of GPIO1, GPIO2, GPIO3 and GPIO4 have 16 kinds, pass through low and high level control
Signal processed can realize 16 kinds of different high-pass filtering circuits, so as to meet the needs of different operating frequency band.
It should be noted that not constituting the restriction to the embodiment of the present application shown in upper table.
Based on physical circuit figure shown in Fig. 3, using Advanced Design System (advanced design system, ADS)
Emulation tool emulates it:
(1) when the control level of GPIO1, GPIO2, GPIO3 and GPIO4 are all low level signal, C2, C5, C8 and C11
Corresponding trap wave unit is not accessed, and resonance frequency is higher.Fig. 5 a is referred to, for the forward direction transmission based on circuit diagram shown in Fig. 3
Coefficient emulates schematic diagram 1, and S (2,1) indicates positive transmission coefficient in Fig. 5 a.Fig. 5 b is referred to, for based on circuit diagram shown in Fig. 3
Input reflection coefficient emulate schematic diagram 1, S (1,1) indicates input reflection coefficient in Fig. 5 b.Fig. 5 a and Fig. 5 b correspond to GPIO1,
The case where control level of GPIO2, GPIO3 and GPIO4 are all low level signal meets Europe DOCSIS3.0 standard DVB-C machine
Top box frequency range standard can achieve the corresponding high-pass filter index of Fig. 1 a at this time.
(2) when the control level of GPIO1, GPIO2, GPIO3 and GPIO4 are all high level signal, C2, C5, C8 and C11
Corresponding trap wave unit is accessed, resonance frequency is minimum.Fig. 6 a is referred to, for the positive transmission system based on circuit diagram shown in Fig. 3
Number emulates schematic diagram 2, and S (2,1) indicates positive transmission coefficient in Fig. 6 a.Fig. 6 b is referred to, for based on circuit diagram shown in Fig. 3
Input reflection coefficient emulates schematic diagram 2, and S (1,1) indicates input reflection coefficient in Fig. 6 b.Fig. 6 a and Fig. 6 b correspond to GPIO1,
The case where control level of GPIO2, GPIO3 and GPIO4 are all high level signal meets North America some areas DOCSIS1.0/
2.0 standard DVB-C set-top box frequency range standards, can achieve the corresponding high-pass filter index of Fig. 1 b at this time.
In order to further verify the Practical Project effect of high-pass filtering circuit provided by the embodiments of the present application, using reality of drawing a design
It tests plate printed circuit board (printed circuit board, PCB) to be verified, Fig. 7 a- Fig. 7 f is based on the embodiment of the present application
High-pass filtering circuit test emulation schematic diagram of drawing a design.
Wherein, Fig. 7 a- Fig. 7 c corresponds to Europe DOCSIS3.0 standard DVB-C set-top box frequency range standard, corresponding with Fig. 1 a
Positive transmission coefficient S21 parameter is compared with input reflection S11 parameter, and the corresponding S21 emulation data of Fig. 7 a- Fig. 7 c are corresponding with Fig. 1 a
S21 parameter it is similar, Fig. 7 a- Fig. 7 c corresponding S11 emulation data S11 parameter corresponding with Fig. 1 a is similar, and Fig. 7a-7c correspondence
Index be all satisfied requirement.
Wherein, Fig. 7 d- Fig. 7 f corresponds to north America region DOCSIS1.0/2.0 standard DVB-C set-top box frequency range standard, with figure
The corresponding positive transmission coefficient S21 parameter of 1b is compared with input reflection S11 parameter, the corresponding S21 emulation data of Fig. 7 d- Fig. 7 f with
The corresponding S21 parameter of Fig. 1 a is similar, and the corresponding S11 emulation data of Fig. 7 d- Fig. 7 f are slightly worse than the corresponding S11 ginseng of Fig. 1 a in high band
Number, but the corresponding index of Fig. 7 d- Fig. 7 f is still met the requirements.It optionally, can be by using high q-factor capacitor and high Q coiling electricity
It emulates data for sense to be transferred to more preferably, intermediate zone is transferred to narrower.
By using high-pass filtering circuit provided by the embodiments of the present application, radio frequency development difficulty can be reduced, reduction changes plate
Number compresses the development cycle, reduces maintenance cost and difficulty, changes technology with a kind of hardware configuration reply different operating frequency band
Demand is conducive to hardware normalization and generates manufacture and configuration.
The embodiment of the present application also provides a kind of high-pass filter including above-mentioned high-pass filtering circuit.
The embodiment of the present application also provides a kind of receiving terminal for digital television, which has applied to number
In line television broadcasting system.The structural schematic diagram of the receiving terminal for digital television 80 can be found in shown in Fig. 8, including processor 801,
Memory 802, input interface 803, output interface 804, audio and video module 805, display module 806, high-pass filter 807 and logical
Believe bus 808.Wherein, communication bus 808 is for realizing the communication connection between these components.
Wherein, processor 801 may include be one or more processors, for example including one or more central processing units
(central processing unit, CPU).Processor 801, which can be, is integrated with demodulation, demultiplexing and decoder chip, also
It is integrated with real-time operation accelerator, can be used for the processing of various operation requirements.Using in the embodiment of the present application, processor 801
The GPIO of the built-in demodulation chip of DVB-C, processor 801 is used for high-pass filter input control signal, to control whether
Unit will be adjusted and access trap wave unit, so that the resonant parameter of change harmonic wave unit is controlled whether, to change high-pass filter
Filtering parameter.
Wherein, memory 802 may include band Electrically Erasable Programmable Read-Only Memory (electrically erasable
Programmable read-only memory, EEPROM), synchronous DRAM (synchronous dynamic
Random access memory, SDRAM) and flash storage etc..Wherein, EEPROM is used to store program parameter information,
SDRAM is for the various data in the storage system course of work, and flash storage is for storing program data.
Wherein, input interface 803 can include but is not limited to Ethernet interface, universal serial bus (universal
Serial bus, USB) interface, rf input interface, panel button input port and infrared remote control input port etc..
Wherein, output interface 804 can include but is not limited to radio frequency output interface, video component (Y, Pb, P r) output connects
Mouth, high-definition multimedia interface (high definition multimedia interface, HDMI) and digital audio are defeated
Outgoing interface etc..
Wherein, audio and video module 805 includes audio amplification output circuit and video output circuit, audio amplification output circuit
For exporting after amplifying analog audio signal, video output circuit is for putting composite video signal through the video amplifier
Output, video component (Y, Pb, P r) export after video filter filters after big.
Wherein, display module 806 is made using the light emitting diode (light-emitting diode, LED) of different colours
For the instruction of power supply and semaphore lock, use 47 sections of charactron as the display of other functions such as channel.
Wherein, high-pass filter 807 includes Fig. 2-high-pass filtering circuit shown in Fig. 4, is applied and is connect in DTV
It receives in terminal, can receive the control signal of the GPIO input of processor 801.It is difficult that high-pass filter 807 can reduce radio frequency exploitation
Degree, reduction change plate number, compress the development cycle, reduce maintenance cost and difficulty, with a kind of hardware configuration reply different operating frequency
Rate section changes technical need, is conducive to hardware normalization and generates manufacture and configuration.
Those of ordinary skill in the art may be aware that being described in conjunction with embodiment disclosed herein each exemplary
Unit and algorithm steps can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are studied carefully
Unexpectedly it is implemented in hardware or software, the specific application and design constraint depending on technical solution.Professional technique people
Member can use different methods to achieve the described function each specific application, but this realization is it is not considered that super
Scope of the present application out.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
In several embodiments provided herein, it should be understood that disclosed systems, devices and methods, it can be with
It realizes by another way.For example, the apparatus embodiments described above are merely exemplary, for example, the unit
It divides, only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components
It can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point, it is shown or
The mutual coupling, direct-coupling or communication connection discussed can be through some interfaces, the indirect coupling of device or unit
It closes or communicates to connect, can be electrical property, mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme
's.
It, can also be in addition, each functional unit in each embodiment of the application can integrate in one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.
In the above-described embodiments, can come wholly or partly by software, hardware, firmware or any combination thereof real
It is existing.When implemented in software, it can entirely or partly realize in the form of a computer program product.The computer program
Product includes one or more computer instructions.When loading on computers and executing the computer program instructions, all or
It partly generates according to process or function described in the embodiment of the present invention.The computer can be general purpose computer, dedicated meter
Calculation machine, computer network or other programmable devices.The computer instruction can store in computer readable storage medium
In, or transmitted by the computer readable storage medium.The computer instruction can be from a web-site, meter
Calculation machine, server or data center pass through wired (such as coaxial cable, optical fiber, Digital Subscriber Line (digital subscriber
Line, DSL)) or wireless (such as infrared, wireless, microwave etc.) mode to another web-site, computer, server or number
It is transmitted according to center.The computer readable storage medium can be any usable medium that computer can access either
The data storage devices such as server, the data center integrated comprising one or more usable mediums.The usable medium can be
Magnetic medium, (for example, floppy disk, hard disk, tape), optical medium (for example, DVD) or semiconductor medium (such as solid state hard disk
(solid state disk, SSD)) etc..
Claims (12)
1. a kind of high-pass filtering circuit, the high-pass filtering circuit is applied in digital cable TV broadcast system, the high pass
Filter circuit includes input terminal, at least one first filter unit, at least one trap wave unit and output end, it is described at least one
It connects between first filter unit, filter input and the input terminal of at least one first filter unit electrically connect
It connects, the filtering output end and the output end of at least one first filter unit are electrically connected, and the trap wave unit is fallen into
The filtering output end of wave input terminal and first filter unit is electrically connected, the trap output end ground connection of the trap wave unit,
It is characterized in that, the high-pass filtering circuit further includes that at least one adjusts unit；
The adjusting unit includes control signal, reference end and control output end, and the control signal receives control signal,
The reference end ground connection, the control output end is connected with the trap wave unit；
The adjusting unit controls whether the adjusting unit accesses the trap wave unit according to the control signal, to control
It states and adjusts the resonant parameter whether unit changes the trap wave unit.
2. high-pass filtering circuit according to claim 1, which is characterized in that the adjusting unit is according to the control signal
Control whether the adjusting unit accesses the trap wave unit, comprising:
If the control signal is Continuity signal, the adjusting unit accesses the trap wave unit, to change the trap list
The resonant parameter of member；
If the control signal is cut-off signal, the adjusting unit does not access the trap wave unit, to keep the trap
The resonant parameter of unit；
Wherein, the Continuity signal is opposite with the level of the cut-off signal.
3. high-pass filtering circuit according to claim 1, which is characterized in that the adjusting unit includes partial pressure unit, opens
Close unit and the second filter unit；
The partial pressure input terminal of the partial pressure unit receives the control signal, opens described in the partial pressure output termination of the partial pressure unit
The switch input terminal of unit and the filter input of second filter unit are closed, the output switching terminal of the switch unit connects
The filtering output end on ground, second filter unit is connected with the trap wave unit.
4. high-pass filtering circuit according to claim 2 or 3, which is characterized in that if the control signal is Continuity signal,
Then the adjusting unit accesses the trap wave unit, comprising:
If the control signal is Continuity signal, the switching means conductive, the filtering output end of second filter unit
It is electrically connected with the trap wave unit, parallel connection accesses the trap wave unit.
5. high-pass filtering circuit according to claim 4, which is characterized in that the trap wave unit include concatenated inductance and
Capacitor；
The filtering output end of the inductance input terminal of the inductance and first filter unit is electrically connected, the inductance of the inductance
The capacitor input terminal of output end and the capacitor is electrically connected, the capacitor output end ground connection of the capacitor；
Or, the filtering output end of the capacitor input terminal of the capacitor and first filter unit is electrically connected, the capacitor
The inductance input terminal of capacitor output end and the inductance is electrically connected, the inductance output end ground connection of the inductance.
6. high-pass filtering circuit according to claim 5, which is characterized in that the filtering output end of second filter unit
It is electrically connected with the trap wave unit, parallel connection accesses the trap wave unit, comprising:
If the filtering output end of the inductance input terminal of the inductance and first filter unit is electrically connected, second filter
The capacitor input terminal of the filtering output end of wave unit and the capacitor is electrically connected, and second filter unit and the capacitor are simultaneously
Connection；
If the filtering output end of the capacitor input terminal of the capacitor and first filter unit is electrically connected, second filter
The inductance input terminal of the filtering output end of wave unit and the inductance is electrically connected, and second filter unit and the inductance are simultaneously
Connection.
7. high-pass filtering circuit according to claim 1, which is characterized in that first filter unit is capacitor.
8. high-pass filtering circuit according to claim 3, which is characterized in that second filter unit is capacitor or electricity
Sense.
9. high-pass filtering circuit according to claim 3, which is characterized in that the switch unit is Schottky diode.
10. high-pass filtering circuit according to claim 1, which is characterized in that it is described control signal by processor input/
Delivery outlet input.
11. a kind of high-pass filter, the high-pass filter is applied in digital cable TV broadcast system, which is characterized in that
The high-pass filter includes such as the described in any item high-pass filtering circuits of claim 1-10.
12. a kind of receiving terminal for digital television, the receiving terminal for digital television is applied in digital cable TV broadcast system,
It is characterized in that, the receiving terminal for digital television includes processor, input interface, output interface, memory and high-pass filtering
Device, the high-pass filter include such as the described in any item high-pass filtering circuits of claim 1-10.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711181324.XA CN109819299B (en) | 2017-11-22 | 2017-11-22 | High-pass filter circuit, high-pass filter and digital television receiving terminal |
| PCT/CN2018/109981 WO2019100863A1 (en) | 2017-11-22 | 2018-10-12 | High-pass filter circuit and high-pass filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711181324.XA CN109819299B (en) | 2017-11-22 | 2017-11-22 | High-pass filter circuit, high-pass filter and digital television receiving terminal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109819299A true CN109819299A (en) | 2019-05-28 |
| CN109819299B CN109819299B (en) | 2021-03-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711181324.XA Active CN109819299B (en) | 2017-11-22 | 2017-11-22 | High-pass filter circuit, high-pass filter and digital television receiving terminal |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN109819299B (en) |
| WO (1) | WO2019100863A1 (en) |
Cited By (2)
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| CN113630352A (en) * | 2021-04-27 | 2021-11-09 | 中国电子科技集团公司第三十研究所 | Frequency continuously adjustable trap circuit based on phase cancellation |
| CN114325024A (en) * | 2021-12-29 | 2022-04-12 | 海华电子企业(中国)有限公司 | Method for testing tuning parameters of efficient trap filter |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2019100863A1 (en) | 2019-05-31 |
| CN109819299B (en) | 2021-03-05 |
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