CN101820509A - Tuner circuit of mobile television receiver and method for using same - Google Patents
Tuner circuit of mobile television receiver and method for using same Download PDFInfo
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- CN101820509A CN101820509A CN200910056912A CN200910056912A CN101820509A CN 101820509 A CN101820509 A CN 101820509A CN 200910056912 A CN200910056912 A CN 200910056912A CN 200910056912 A CN200910056912 A CN 200910056912A CN 101820509 A CN101820509 A CN 101820509A
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Abstract
The invention discloses a tuner circuit of a mobile television receiver and a method for using the same. The circuit comprises a low-noise amplifier, wherein the low-noise amplifier is connected with a frequency mixer; and the frequency mixer is connected with a frequency comprehensive device by an I/Q local oscillation signal switching circuit; and an output end of the frequency mixer is connected with a low-pass filter, and an amplifier and an analog to digital converter. Due to the I/Q two-channel multiplexing, the power consumption and the cost of a chip are lowered, the gains and the phase mismatch of the two I/Q channels are consistent, the circuits used for correcting the gains and the phase mismatch are not necessary, and the design complexity of the chip is lowered.
Description
Technical field
The present invention relates to the digital mobile television receiver applied technical field, particularly relate to a kind of digital mobile television receiver tuner circuit and using method thereof.
Background technology
Developing rapidly along with wireless telecommunications in recent years, the function of mobile phone from strength to strength, people are when using mobile phone to communicate, also its amusement function is had higher requirement, and represent as typical case wherein, one of new business that the future communications field is the most promising is thought in mobile phone TV services by operator.Appearance along with agreements such as DAB, DVB-H, CMMB, TMMB and standard, the market of digital moving-tv is in swift and violent growth, the competition of the inherent digital mobile television receiver chip of global range aspect is growing more intense, and competition mainly concentrates on two aspects: one is low-power consumption; The 2nd, low-cost.A digital mobile television receiver chip mainly comprises two parts: tuner chip and digital baseband process chip.Conventional architectures as shown in Figure 1 in tuner chip: after low noise amplifier, generally all have two branch roads of I/Q to realize that the simulation part of baseband signal divides demodulation, two branch roads of I/Q mainly comprise frequency mixer, low pass filter, variable gain amplifier and DC drift eliminator etc.Also need two analog to digital converters (ADC) to realize the I/Q two paths of signals is sampled in digital baseband part in addition.
Traditional tuner chip framework has following several shortcoming: 1) area of I/Q two-way and power consumption expense are bigger; 2) the digital baseband decoding algorithm is relatively more responsive to the gain and the phase mismatch of I/Q two-way.In some tuner chips, gain and phase mismatch in order to reduce, increase gain and phase mismatch calibration circuit or required the gain of I/Q two-way to regulate and control respectively and the regulation and control step-length that gains requires very meticulous, these have all increased the complexity that tuning chip designs, and have increased the cost of tuner chip.The digital mobile television receiver chip is all very responsive for power consumption and cost as mobile device, and therefore any solution that can significantly reduce power consumption and cost all is competitive scheme.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of I/Q and receives the multiplexing digital mobile television receiver tuner circuit framework of link, satisfies the requirement of digital moving-tv to power consumption and cost.
For solving above technical problem, technology contents of the present invention comprises low noise amplifier, and described low noise amplifier is connected with No. one frequency mixer; Described frequency mixer is connected with frequency synthesizer by I/Q local oscillation signal commutation circuit; Be connected with No. one low pass filter, amplifier and analog to digital converter at described mixer output.
Technique effect of the present invention is: multiplexing by the I/Q two-way, at first can reduce chip power-consumption and cost; Because the I/Q two-way is multiplexing, the gain of I/Q two-way is consistent with phase mismatch in addition, does not need to do gain and phase mismatch calibration circuit, reduces the design complexity of chip.
The using method of tuner circuit of mobile television receiver of the present invention may further comprise the steps: produce one group of orthogonal signalling with phase quadrature; Frequency synthesizer produces the I/Q local oscillation signal; Described orthogonal signalling with phase quadrature are alternately controlled described I/Q local oscillation signal, in half clock cycle, receive I road signal, in other half clock cycle, receive Q road signal; By the transformation from serial to parallel circuit i/q signal of serial is become parallel I, Q two paths of signals.
Description of drawings
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail:
Fig. 1 is a conventional digital mobile TV tuner circuit configuration diagram;
Fig. 2 is the described I/Q link of an embodiment of the invention multiplex circuit configuration diagram;
Fig. 3 is the clock signal schematic diagram that control frequency synthesizer IQ two-way local oscillation signal switches.
Embodiment
As shown in Figure 2, the present invention realizes that at the digital mobile television receiver tuner chip I/Q two paths of signals is multiplexing, and its structure comprises: low noise amplifier is connected with No. one frequency mixer in the back of described low noise amplifier; Described frequency mixer is connected with frequency synthesizer by I/Q local oscillation signal commutation circuit; Be connected with No. one low pass filter and No. one variable gain amplifier and No. one analog to digital converter at described mixer output.
As shown in Figure 3, the present invention replaces control transmission IQ signal (cycle is T) by one group of orthogonal signalling with phase quadrature, the I/Q local oscillation signal that control chart 2 medium frequency synthesizers produce is alternately to frequency mixer, in half clock cycle, receive link and will receive I road signal, in other half clock cycle, receive link and receive Q road signal, by the transformation from serial to parallel circuit i/q signal of serial is become parallel I, Q two paths of signals then.In digital baseband circuit, need the phase place difference of T/2 that I, Q two paths of signals are had to compensate, because T/2 determines in circuit, so compensation can realize easily.
The orthogonal signalling that the present invention's proposition has phase quadrature replace control transmission IQ signal, only require orthogonal signalling switching times much smaller than the baseband signal cycle in realization, adopt which kind of framework not require to the chip radio-frequency front-end, that is to say that this patent can be applied to other communication chip radio-frequency front-ends.
More than, the present invention is had been described in detail, but these are not to be construed as limiting the invention by embodiment.Under the situation that does not break away from the principle of the invention, those skilled in the art also can make many distortion and improvement, and these also should be considered as protection scope of the present invention.
Claims (3)
1. a tuner circuit of mobile television receiver is characterized in that, comprising:
Low noise amplifier,
Described low noise amplifier is connected with No. one frequency mixer;
Described frequency mixer is connected with frequency synthesizer by I/Q local oscillation signal commutation circuit;
Be connected with No. one low pass filter, amplifier and analog to digital converter at described mixer output.
2. tuner circuit of mobile television receiver as claimed in claim 1 is characterized in that, described amplifier is a variable gain amplifier.
3. the using method of tuner circuit of mobile television receiver as claimed in claim 1 is characterized in that, may further comprise the steps:
Produce one group of orthogonal signalling with phase quadrature;
Frequency synthesizer produces the I/Q local oscillation signal;
Described orthogonal signalling with phase quadrature are alternately controlled described I/Q local oscillation signal, in half clock cycle, receive I road signal, in other half clock cycle, receive Q road signal;
By the transformation from serial to parallel circuit i/q signal of serial is become parallel I, Q two paths of signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910056912A CN101820509A (en) | 2009-02-26 | 2009-02-26 | Tuner circuit of mobile television receiver and method for using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910056912A CN101820509A (en) | 2009-02-26 | 2009-02-26 | Tuner circuit of mobile television receiver and method for using same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101820509A true CN101820509A (en) | 2010-09-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910056912A Pending CN101820509A (en) | 2009-02-26 | 2009-02-26 | Tuner circuit of mobile television receiver and method for using same |
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| Country | Link |
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| CN (1) | CN101820509A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102790845A (en) * | 2012-07-21 | 2012-11-21 | 安徽工业大学 | Improved five-order low-pass filter |
Citations (7)
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| CN1297622A (en) * | 1999-04-02 | 2001-05-30 | 松下电器产业株式会社 | Radio device and transmitting/receiving method |
| CN1708035A (en) * | 2004-06-04 | 2005-12-14 | 美国博通公司 | Method and system for analog and digital RF receiver interface |
| US20070049228A1 (en) * | 2005-08-29 | 2007-03-01 | Akira Fujishima | High-frequency receiver |
| CN1973431A (en) * | 2004-04-30 | 2007-05-30 | 泰景***公司 | Integrated analog video receiver |
| CN101102118A (en) * | 2006-06-08 | 2008-01-09 | 美国凹凸微系有限公司 | Adaptive wireless receiver |
| CN101198160A (en) * | 2007-05-25 | 2008-06-11 | 北京大学 | Method and device for implementing GNSS multi-module parallelism receiving at front end by using single path radio frequency |
| CN201087955Y (en) * | 2007-09-30 | 2008-07-16 | 南靖万利达科技有限公司 | Digital analog television signal commutation projector |
-
2009
- 2009-02-26 CN CN200910056912A patent/CN101820509A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1297622A (en) * | 1999-04-02 | 2001-05-30 | 松下电器产业株式会社 | Radio device and transmitting/receiving method |
| CN1973431A (en) * | 2004-04-30 | 2007-05-30 | 泰景***公司 | Integrated analog video receiver |
| CN1708035A (en) * | 2004-06-04 | 2005-12-14 | 美国博通公司 | Method and system for analog and digital RF receiver interface |
| US20070049228A1 (en) * | 2005-08-29 | 2007-03-01 | Akira Fujishima | High-frequency receiver |
| CN101102118A (en) * | 2006-06-08 | 2008-01-09 | 美国凹凸微系有限公司 | Adaptive wireless receiver |
| CN101198160A (en) * | 2007-05-25 | 2008-06-11 | 北京大学 | Method and device for implementing GNSS multi-module parallelism receiving at front end by using single path radio frequency |
| CN201087955Y (en) * | 2007-09-30 | 2008-07-16 | 南靖万利达科技有限公司 | Digital analog television signal commutation projector |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102790845A (en) * | 2012-07-21 | 2012-11-21 | 安徽工业大学 | Improved five-order low-pass filter |
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Application publication date: 20100901 |