CN105158579A - Silicon tuner RF FILTER automatic detection method - Google Patents
Silicon tuner RF FILTER automatic detection method Download PDFInfo
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- CN105158579A CN105158579A CN201510543485.3A CN201510543485A CN105158579A CN 105158579 A CN105158579 A CN 105158579A CN 201510543485 A CN201510543485 A CN 201510543485A CN 105158579 A CN105158579 A CN 105158579A
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Abstract
The invention discloses a silicon tuner RF FILTER automatic detection method. RF FILTER frequency selecting range is read via a control IIC bus and compared with the set selecting frequency deviation range and judgment is performed. The judgment result is fed back via a display interface, and a certain inductor with problems can be determined through the result. Therefore, investment of equipment and human resources in RF FILTER detection can be reduced for television manufacturers so that production cost can be reduced, production efficiency can be enhanced and product quality can be enhanced.
Description
Technical field
The present invention relates to RFFILTER detection technique field, be specifically related to a kind of method that silicon tuner RFFILTER detects automatically.
Background technology
RFFILTER is the frequency selection network in tuner, and the general LC resonance filter consisted of the built-in tunable capacitor of tuner chip and external frequency-selecting inductance, realizes each frequency range frequency-selecting at present.For guaranteeing frequency selection network performance, from the frequency range that tuner VHF to UHF is corresponding, frequency-selecting filter should be able to ensure that each wave band can normally work.But due to the restriction of inductance manufacturing process, inductance sensibility reciprocal ubiquity deviation, consistance is comparatively hard to keep, and the parasitic element (as SMD resistance in series) that PCB layout is brought unavoidably also can affect the selectivity of wave filter simultaneously.If frequency-selecting filter operation irregularity, not easily discovered by subjective judgement when complete machine scheduling and planning, but can embody in tuner performance test index of correlation, cause test failure.
For head it off, traditional CANTUNER device production manufacturer all can drop into high-frequency test equipment, strictly can detect before each tuner dispatches from the factory for RFFILTER frequency-selecting scope, to judge inductance quality, qualifiedly just to dispatch from the factory afterwards.Along with the progress of technology, current liquid crystal television mainboard more adopts plate to carry silicon Tuner scheme, and tuner chip and frequency-selecting inductance are all integrated on mainboard, and RFFILTER selectivity and inductance consistency detection need be carried out in TV set core debugging.Concerning television manufacturer, the input of high-frequency detection equipment and testing staff need be increased, increase production cost, reduce production efficiency.
Summary of the invention
Instant invention overcomes the deficiencies in the prior art, there is the technical matters of high cost investment in a kind of method providing silicon tuner RFFILTER automatically to detect for solving existing detection mode.
Consider the problems referred to above of prior art, according to an aspect disclosed by the invention, the present invention by the following technical solutions:
The method that silicon tuner RFFILTER detects automatically, it comprises:
I) pre-set the frequency-selecting frequency departure scope of RFFILTER;
II) read RFFILTER frequency-selecting scope actual in TUNER chip register;
III) the RFFILTER frequency-selecting scope of described reality read and the frequency-selecting frequency departure scope of the described RFFILTER of pre-setting are compared, for judging whether frequency-selecting scope and/or the peripheral frequency-selecting inductance of Tuner meet design requirement.
In order to realize the present invention better, further technical scheme is:
According to one embodiment of the invention, preset frequency-selecting scope to 49.75MHz-863.25MHz subsection setup.
According to another embodiment of the invention, described subsection setup comprises VHFLOW, VHFHIGH, UHFLOW, UHFHIGH totally 4 sections of frequency-selecting frequency ranges, and each frequency-selecting frequency range is a corresponding band limits respectively.
According to another embodiment of the invention, peripheral 4 the RF frequency-selecting inductance of TUNER and the integrated variable capacitance of chip internal form 4 LC resonance filters, and this resonance filter and default frequency-selecting frequency range VHFLOW, VHFHIGH, UHFLOW, UHFHIGH are relation one to one.
According to another embodiment of the invention, described frequency-selecting frequency range comprises Begin-bandFrequency and End-bandFrequency totally 8 Frequency points respectively, and common formation 4 length of tape lead to frequency-selecting filter.
The present invention can also be:
According to another embodiment of the invention, it is further comprising the steps of:
1) Tuner initialization
Master chip reads tuner address by iic bus, then sends Tuner_AUTO_CHECK control command and makes tuner enter Auto-Sensing Mode, detects tuner status indicator position, and feeds back testing result by display interface;
2) bandpass filter virtual condition register assignment
Define 8 integer functions, be respectively used to deposit 8 actual condition value read from Tuner register, initial value is set to 0 entirely; Define 8 floating type functions in addition, be respectively used to Begin-bandFrequency and End-bandFrequency depositing 4 bandpass filter reality, initial value is set to 0.0 entirely; First, software enters Tuner stater address by iic bus, read the value in first status register address, the Begin-bandFrequency virtual condition of the corresponding bandpass filter VHFLOW of this value, is then assigned to the integer function 1 of definition by the value of this register; Then continue through iic bus order and read other 7 bandpass filter status register numerical value, assignment gives other 7 integer functions respectively;
3) bandpass filter-3dB cutoff frequency calculates
According to the difference of bandpass filter segmentation, define 8 kinds of algorithms, according to actual value in the Tuner status register read, calculate-3dB the cutoff frequency of VHFLOW, VHFHIGH, UHFLOW, UHFHIGH bandpass filter respectively, assignment gives 8 floating-point functions of definition respectively;
4) actual bandpass filter and interiorly establish bandpass filter multilevel iudge
According to the value of software algorithm and read status register, calculate the bandpass filter-3dB cutoff frequency of Tuner reality, and compare judgement with preset standard cutoff frequency, and return judged result respectively, if actual cutoff frequency is all within the scope of the accurate cutoff frequency of interior bidding, then think that RFFILTER is qualified, otherwise then think defective;
5) judged result is carried out feeding back or showing.
Compared with prior art, one of beneficial effect of the present invention is:
The method that a kind of silicon tuner RFFILTER of the present invention detects automatically, decrease the input of TV production firm to tuner frequency-selecting filter checkout equipment, in movement debug process, the corresponding detection of RFFILTER only need be performed according to the present invention, accurately can judge the performance of each section of wave filter, and judge chip periphery frequency-selecting inductance accordingly whether in deviation range, also can provide guidance foundation for the repair and replacement of single device.
Accompanying drawing explanation
In order to clearer explanation present specification embodiment or technical scheme of the prior art, below the accompanying drawing used required in the description to embodiment or prior art is briefly described, apparently, the accompanying drawing that the following describes is only the reference to some embodiments in present specification, for those skilled in the art, when not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 shows RFFILTER according to an embodiment of the invention and detects schematic diagram.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Shown in Figure 1, a kind of method that silicon tuner RFFILTER inductance detects automatically, read RFFILTER frequency-selecting scope actual in TUNER chip register by entering iic bus, and compare with inner setting frequency-selecting scope, judge whether frequency-selecting scope meets design requirement.
And according to the comparative result of the actual frequency-selecting scope of RFFILTER and software design patterns frequency-selecting scope, can judge whether the peripheral frequency-selecting inductance of Tuner meets design requirement.
Due to difference between tuner solution manufacturer, RFFILTER segmentation is also different.In the present embodiment, tuner RFFILTER frequency-selecting bandpass filter is divided into 4 sections, i.e. VHFLOW section (45-145.9MHz), VHFHIGH section (146-367.1MHz), UHFLOW section (367.2-624.1MHz), UHFHIGH section (624.2--866MHz), external 4 inductance of chip and built-in chip type variable capacitance form the LC frequency-selecting bandpass filter of each section respectively, can realize 49.75-863.25MHz full rate and cover.Frequency-selecting frequency range VHFLOW, VHFHIGH, UHFLOW, UHFHIGH be a corresponding band limits respectively, should comprise Begin-bandFrequency and End-bandFrequency totally 8-3dB Frequency points respectively, and common formation 4 length of tape lead to frequency-selecting filter.I.e. Begin-bandFrequency and End-bandFrequency of each length of tape bandpass filter).
Peripheral 4 the RF frequency-selecting inductance of TUNER and the integrated variable capacitance of chip internal form 4 LC resonance filters, establish frequency-selecting frequency range VHFLOW in this resonance filter and software, VHFHIGH, UHFLOW, UHFHIGH be necessary for relation one to one, each other can not be overlapping, in order to avoid bring channel crosstalk into.
Software detects by completing RFFILTER with the next stage, and feedback result:
1, Tuner initial phase: enter factory's detecting pattern in movement debug process, first Tuner initialization testing process is performed, master chip reads tuner address by iic bus, then sending Tuner_AUTO_CHECK control command makes tuner enter Auto-Sensing Mode, detect tuner status indicator position, and feed back testing result by display interface.
2, in the bandpass filter virtual condition register assignment stage: define 8 integer functions, be respectively used to deposit 8 actual condition value read from Tuner register, initial value is set to 0 entirely; Define 8 floating type functions in addition, be respectively used to Begin-bandFrequency and End-bandFrequency depositing 4 bandpass filter reality, initial value is set to 0.0 entirely.First, Tuner stater address is entered by iic bus, read the value in first status register address, the Begin-bandFrequency virtual condition of the corresponding bandpass filter VHFLOW of this value, is then assigned to the integer function 1 of definition by the value of this register; Then continue through iic bus order and read other 7 bandpass filter status register numerical value, assignment gives other 7 integer functions respectively.
3, bandpass filter-3dB cutoff frequency calculation stages: according to the difference of bandpass filter segmentation, define 8 kinds of algorithms, according to actual value in the Tuner status register read, calculate-3dB the cutoff frequency of VHFLOW, VHFHIGH, UHFLOW, UHFHIGH bandpass filter respectively, assignment gives 8 floating-point functions of definition respectively.
4, actual bandpass filter and interiorly establish the bandpass filter multilevel iudge stage: according to value and the corresponding algorithm of read status register, accurately can calculate the bandpass filter-3dB cutoff frequency of Tuner reality, and compare judgement with preset standard cutoff frequency, and return judged result respectively, and all results are carried out logic and operation, if actual cutoff frequency all within the scope of the accurate cutoff frequency of interior bidding, is then thought that RFFILTER is qualified, otherwise is then thought defective.
5, judged result feedback, the display stage: if judged result is qualified, display RFFILTEROK, otherwise display RFFILTERFAIL.Because the numerical value in bandpass filter and Tuner register is relation one to one, according to the cutoff frequency judged result of step 4, can show is numerical bias in some status registers, and commissioning staff can judge it is which frequency-selecting inductance deviation immediately, and convenient for maintaining personnel keep in repair.
In sum, the method that a kind of RFFILTER frequency selection network provided by the invention detects automatically, RFFILTER frequency-selecting scope is read by controlling iic bus, judgement is compared with the frequency-selecting frequency departure scope arranged, feed back judged result by display interface, and determine it is outside which inductance existing problems by this result.So can reduce equipment that television manufacturer detects for RFFILTER and human resources drop into, reduce production cost, improve production efficiency, improve product quality.
In this instructions, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiment, identical similar portion cross-reference between each embodiment.
Spoken of in this manual " embodiment ", " another embodiment ", " embodiment ", etc., refer to the specific features, structure or the feature that describe in conjunction with this embodiment and be included at least one embodiment of the application's generality description.Multiple place occurs that statement of the same race is not necessarily refer to same embodiment in the description.Furthermore, when describing specific features, structure or a feature in conjunction with any embodiment, what advocate is also fall within the scope of the invention to realize this feature, structure or feature in conjunction with other embodiments.
Although with reference to multiple explanatory embodiment of the present invention, invention has been described here, but, should be appreciated that, those skilled in the art can design a lot of other amendment and embodiment, these amendments and embodiment will drop within spirit disclosed in the present application and spirit.More particularly, in the scope of and claim open in the application, multiple modification and improvement can be carried out to the building block of subject combination layout and/or layout.Except the modification of carrying out building block and/or layout is with except improvement, to those skilled in the art, other purposes also will be obvious.
Claims (6)
1. the method that automatically detects of silicon tuner RFFILTER, is characterized in that it comprises:
I) pre-set the frequency-selecting frequency departure scope of RFFILTER;
II) read RFFILTER frequency-selecting scope actual in TUNER chip register;
III) the RFFILTER frequency-selecting scope of described reality read and the frequency-selecting frequency departure scope of the described RFFILTER of pre-setting are compared, for judging whether frequency-selecting scope and/or the peripheral frequency-selecting inductance of Tuner meet design requirement.
2. the method that automatically detects of silicon tuner RFFILTER according to claim 1, is characterized in that default frequency-selecting scope is to 49.75MHz-863.25MHz subsection setup.
3. the method that automatically detects of silicon tuner RFFILTER according to claim 2, is characterized in that described subsection setup comprises VHFLOW, VHFHIGH, UHFLOW, UHFHIGH totally 4 sections of frequency-selecting frequency ranges, and each frequency-selecting frequency range is a corresponding band limits respectively.
4. the method that automatically detects of silicon tuner RFFILTER according to claim 3, it is characterized in that peripheral 4 the RF frequency-selecting inductance of TUNER and the integrated variable capacitance of chip internal form 4 LC resonance filters, this resonance filter and default frequency-selecting frequency range VHFLOW, VHFHIGH, UHFLOW, UHFHIGH are relation one to one.
5. the method that automatically detects of silicon tuner RFFILTER according to claim 3, is characterized in that described frequency-selecting frequency range comprises Begin-bandFrequency and End-bandFrequency totally 8 Frequency points respectively, jointly forms 4 length of tape and leads to frequency-selecting filter.
6. the method that automatically detects of silicon tuner RFFILTER according to claim 1, is characterized in that it is further comprising the steps of:
1) Tuner initialization
Master chip reads tuner address by iic bus, then sends Tuner_AUTO_CHECK control command and makes tuner enter Auto-Sensing Mode, detects tuner status indicator position, and feeds back testing result by display interface;
2) bandpass filter virtual condition register assignment
Define 8 integer functions, be respectively used to deposit 8 actual condition value read from Tuner register, initial value is set to 0 entirely; Define 8 floating type functions in addition, be respectively used to Begin-bandFrequency and End-bandFrequency depositing 4 bandpass filter reality, initial value is set to 0.0 entirely; First, software enters Tuner stater address by iic bus, read the value in first status register address, the Begin-bandFrequency virtual condition of the corresponding bandpass filter VHFLOW of this value, is then assigned to the integer function 1 of definition by the value of this register; Then continue through iic bus order and read other 7 bandpass filter status register numerical value, assignment gives other 7 integer functions respectively;
3) bandpass filter-3dB cutoff frequency calculates
According to the difference of bandpass filter segmentation, define 8 kinds of algorithms, according to actual value in the Tuner status register read, calculate-3dB the cutoff frequency of VHFLOW, VHFHIGH, UHFLOW, UHFHIGH bandpass filter respectively, assignment gives 8 floating-point functions of definition respectively;
4) actual bandpass filter and interiorly establish bandpass filter multilevel iudge
According to the value of software algorithm and read status register, calculate the bandpass filter-3dB cutoff frequency of Tuner reality, and compare judgement with preset standard cutoff frequency, and return judged result respectively, if actual cutoff frequency is all within the scope of the accurate cutoff frequency of interior bidding, then think that RFFILTER is qualified, otherwise then think defective;
5) judged result is carried out feeding back or showing.
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Cited By (1)
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| CN106973342A (en) * | 2017-03-21 | 2017-07-21 | 合肥极友软件开发有限公司 | Vehicle audio tuner adjust automatically detecting system based on I2C buses |
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