CN101790059A - Television tuner with high Q value tuned filter - Google Patents
Television tuner with high Q value tuned filter Download PDFInfo
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- CN101790059A CN101790059A CN 201010127555 CN201010127555A CN101790059A CN 101790059 A CN101790059 A CN 101790059A CN 201010127555 CN201010127555 CN 201010127555 CN 201010127555 A CN201010127555 A CN 201010127555A CN 101790059 A CN101790059 A CN 101790059A
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- tracking filter
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Abstract
The invention relates to a television tuner with a high Q value tuned filter. The television tuner comprises a radio frequency receiving antenna, a low-noise amplifier, an image interference rejection mixer, a low-pass filter, a tracking filter, a variable gain amplifier, an analog-digital converter, a digital signal processing module, a first PN code detector, a second PN code detector and a local oscillator, wherein the radio frequency receiving antenna, the low-noise amplifier, the tracking filter, the variable gain amplifier, the image interference rejection mixer, the low-pass filter, the analog-digital converter and the digital signal processing module are connected with one another in turn; an output end of the first PN code detector is connected with an input end of the tracking filter; an output end of the second PN code detector is connected to an output end of the tracking filter; and an output end of the local oscillator is connected with an input end of the image interference rejection mixer. The television tuner has the advantage that a received television radio frequency signal is not influenced by a reference signal.
Description
Technical field
The present invention relates to a kind of TV tuner, relate in particular to a kind of TV tuner with high Q value tuned filter.
Background technology
Along with the communication technology and compress technique progress, television broadcasting little by little replaces to digital television broadcasting from analog television broadcast, and the change of digital broadcasting drives developing rapidly of related industry.And tuner circuit is all accounting for critical role in digital television and set-top box or mobile receiving system.Tuner is commonly called as station selector, and its function is earlier the radiofrequency signal of accepting to be amplified, and the channel of selecting the channel wanted and filtering not to want then interferes with the channel of wanting to avoid channel not in the frequency reducing process.
Yet existing TV tuner is the filtering unwanted signal thoroughly, and TV signal is disturbed by it, makes it not ideal enough.
Summary of the invention
The technical problem to be solved in the present invention is: a kind of TV tuner with high Q value tuned filter is provided, and its filtering performance is good, can effectively suppress nonideal signal.
The technical solution adopted for the present invention to solve the technical problems is: a kind of TV tuner with high Q value tuned filter, it comprises the radio frequency reception antenna, low noise amplifier, mirror image disturbs and suppresses frequency mixer, low pass filter, also comprise tracking filter, variable gain amplifier, analog-digital converter and digital signal processing module, the one PN sign indicating number detector, the 2nd PN sign indicating number detector and local oscillator, radio frequency reception antenna wherein, low noise amplifier, tracking filter, variable gain amplifier, mirror image disturbs and suppresses frequency mixer, low pass filter, analog-digital converter and digital signal processing module are linked in sequence, the output of the one PN sign indicating number detector is connected in the input of tracking filter, the output of the 2nd PN sign indicating number detector is connected in the output of tracking filter, and the output of local oscillator is connected in mirror image and disturbs the input that suppresses frequency mixer.
Further: described tracking filter comprises an on-chip inductor and at least one variable capacitance.
The invention has the beneficial effects as follows that the present invention can make the TV RF signals that receives not be subjected to the influence of reference signal.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is the calcspar that the present invention has the TV tuner circuit of high Q value tuned filter;
Fig. 2 is the calcspar of high Q value tuned filter circuit;
Fig. 3 is the spectrum diagram of signal spectrum and filter signal;
Fig. 4 is the spectrum diagram of intermediate-freuqncy signal frequency spectrum and direct current tuning reference signal;
Among the figure: 1, radio frequency reception antenna, 2, low noise amplifier, 3, tracking filter, 4, variable gain amplifier, 5, heterogeneous radiofrequency signal, 6, mirror image disturbs and suppress frequency mixer, 7, heterogeneous intermediate-freuqncy signal, 8, low pass filter, 9, analog-digital converter, 10, digital signal processing module, 11, PN sign indicating number detector, 11-1, a PN sign indicating number detector, 11-2, the 2nd PN sign indicating number detector, 12, recursive filter, 13, local oscillator, 14, filter controller.
Embodiment
Shown in Fig. 1-4, the TV tuner with high Q value tuned filtering comprises that radio frequency reception antenna 1, low noise amplifier 2, tracking filter 3, variable gain amplifier 4, mirror image disturb inhibition frequency mixer 6, low pass filter 8, analog-digital converter 9, digital signal processing module 10, a PN sign indicating number detector 11-1, the 2nd PN sign indicating number detector 11-2 and local oscillator 13.The TV signal that obtains when radio frequency reception antenna 1 is at first amplified by low noise amplifier 2, tracking filter 3 filters the signal that does not need channel then, amplified by a variable gain amplifier 4 again, signal after treatment can disturb inhibition frequency mixer 6 will need the centre frequency of channel to be mixed into intermediate-freuqncy signal by mirror image, intermediate-freuqncy signal is again by fixing low pass filter 8 filtering of a centre frequency, be converted to digital signal by analog-digital converter on the sheet 9 then, further handle by 10 pairs of digital signals of digital signal processing module then, finally obtain output.The purpose of tracking filter 3 is that all do not need the signal in the channel for filtering, if these signals are not by filtering, they not only can with the signal of local oscillator 13 mixing together and also can and self mixing, the frequency of some mixed frequency signal can be within the base band, thereby has influence on by the signal of need channel.The performance of tracking filter 3 other channel signals of filtering is good more, and receiver receives is needed the performance of channel signals just good more, and therefore, the Q value of tracking filter 3 is high more, and he just can suppress imperfect signal more.The tracking filter 3 of high Q value can realize by on-chip inductor, for example spirality inductance or bonding wire inductance, and voltage variable capacitance diode, but the centre frequency of high Q value filtering device is very responsive for environment, temperature for example, variable capacitance diode control voltage, technology or the like.High Q value trace filter 3 comprises an on-chip inductor and at least one variable capacitance, control the centre frequency of tracking filter 3 by the bias voltage of adjusting variable capacitance, for with centre frequency be tuned to ideal value, two groups of reference signals are injected the input and output side of tracking filter 3 continuously, tuning reference signal is two local oscillator signals, by two incoherent pseudo noise codes local oscillator signal is carried out phase modulated, all tuning reference signal all are injected into the common mode terminal of tracking filter 3, and they are minimum to the dynamic range influence of TV tuner.Tracking filter 3 also needs to be adjusted to different frequencies to be used to receive different channels.
Adopt different types of frequency mixer that TV RF signals is transformed into intermediate-freuqncy signal in the tuner.Because tuning reference signal is injected into radiofrequency signal and becomes its part, therefore these reference signals also are converted into intermediate-freuqncy signal, simultaneously because tuning reference signal has identical frequency with local oscillator signal, after the process frequency mixer, these two reference signals are converted into two pseudorandom modulated direct current signals.For the low speed modulating data, low pass filter 8 can be separated the direct current tuning reference signal from the intermediate-freuqncy signal of needs, and reference signal just can not have influence on the TV signal of intermediate frequency like this.
Mirror image disturb to suppress to comprise several compositions in the direct current output of frequency mixer 6, tuning reference signal for example, and the DC maladjustment of frequency mixer, the leakage of local oscillator in the frequency mixer has the input signal of same frequency, 1/f noise or the like with local oscillator 13.Because tuning reference signal has been carried out phase modulated by known pseudorandomcode, PN sign indicating number detector 11 can be separated tuning reference signal by surveying correlation from all flip-flops of frequency mixer output.Two independently PN sign indicating number detector generate two independently outputs, one corresponding to the tuning reference signal of coming self-tracking filter 3 inputs, another is corresponding to the tuning reference signal of coming self-tracking filter 3 outputs.Because tracking filter 3 produces the phase shift of one 90 degree at the centre frequency place, if the output of two relevance detector is used for measuring the phase shift of tracking filter 3 at the local oscillator frequency place, be not 90 degree if differ, the centre frequency of tracking filter 3 can be done corresponding adjustment.
The bias voltage of variable capacitance has determined the centre frequency of tracking filter 3, on the basis of PN sign indicating number detector 11, filter controller 14 is adjusted the output valve of its analog-digital converter 9, is used to control the bias voltage of variable capacitance or opens and closes the variable capacitance array.
Claims (2)
1. TV tuner with high Q value tuned filter, it comprises radio frequency reception antenna (1), low noise amplifier (2), mirror image disturbs and suppresses frequency mixer (6), low pass filter (8), it is characterized in that: also comprise tracking filter (3), variable gain amplifier (4), analog-digital converter (9) and digital signal processing module (10), the one PN sign indicating number detector (11-1), the 2nd PN sign indicating number detector (11-2) and local oscillator (13), radio frequency reception antenna (1) wherein, low noise amplifier (2), tracking filter (3), variable gain amplifier (4), mirror image disturbs and suppresses frequency mixer (6), low pass filter (8), analog-digital converter (9) and digital signal processing module (10) are linked in sequence, the output of the one PN sign indicating number detector (11-1) is connected in the input of tracking filter (3), the output of the 2nd PN sign indicating number detector (11-2) is connected in the output of tracking filter (3), and the output of local oscillator (13) is connected in mirror image and disturbs the input that suppresses frequency mixer (6).
2. the TV tuner with high Q value tuned filter according to claim 1 is characterized in that: described tracking filter (3) comprises an on-chip inductor and at least one variable capacitance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010127555 CN101790059A (en) | 2010-03-19 | 2010-03-19 | Television tuner with high Q value tuned filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010127555 CN101790059A (en) | 2010-03-19 | 2010-03-19 | Television tuner with high Q value tuned filter |
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| CN101790059A true CN101790059A (en) | 2010-07-28 |
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| CN 201010127555 Pending CN101790059A (en) | 2010-03-19 | 2010-03-19 | Television tuner with high Q value tuned filter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102315854A (en) * | 2011-05-11 | 2012-01-11 | 武汉理工大学 | Agile ultrashort wave numerical control tracking tuning amplifying circuit with high anti-interference |
| CN111817685A (en) * | 2020-07-31 | 2020-10-23 | 曾运华 | Electrically tunable microwave active filter |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050048939A1 (en) * | 2003-08-28 | 2005-03-03 | Broadcom Corporation | Apparatus and method for local oscillator calibration in mixer circuits |
| US20050152481A1 (en) * | 2004-01-09 | 2005-07-14 | Ying-Yao Lin | Method and apparatus of iq mismatch calibration |
| CN1798287A (en) * | 2004-12-20 | 2006-07-05 | 财团法人工业技术研究院 | Tuner of TV system and turning method |
| CN1937405A (en) * | 2005-06-08 | 2007-03-28 | 英特尔公司 | Radio frequency tuner |
| CN101427466A (en) * | 2006-04-17 | 2009-05-06 | 射频魔力公司 | Receiver with tuner front end using tracking filters and calibration |
-
2010
- 2010-03-19 CN CN 201010127555 patent/CN101790059A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050048939A1 (en) * | 2003-08-28 | 2005-03-03 | Broadcom Corporation | Apparatus and method for local oscillator calibration in mixer circuits |
| US20050152481A1 (en) * | 2004-01-09 | 2005-07-14 | Ying-Yao Lin | Method and apparatus of iq mismatch calibration |
| CN1798287A (en) * | 2004-12-20 | 2006-07-05 | 财团法人工业技术研究院 | Tuner of TV system and turning method |
| CN1937405A (en) * | 2005-06-08 | 2007-03-28 | 英特尔公司 | Radio frequency tuner |
| CN101427466A (en) * | 2006-04-17 | 2009-05-06 | 射频魔力公司 | Receiver with tuner front end using tracking filters and calibration |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102315854A (en) * | 2011-05-11 | 2012-01-11 | 武汉理工大学 | Agile ultrashort wave numerical control tracking tuning amplifying circuit with high anti-interference |
| CN102315854B (en) * | 2011-05-11 | 2013-11-20 | 武汉理工大学 | Agile ultrashort wave numerical control tracking tuning amplifying circuit with high anti-interference |
| CN111817685A (en) * | 2020-07-31 | 2020-10-23 | 曾运华 | Electrically tunable microwave active filter |
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Open date: 20100728 |