CN200994123Y - Automatic frequency tuner - Google Patents
Automatic frequency tuner Download PDFInfo
- Publication number
- CN200994123Y CN200994123Y CN 200720033611 CN200720033611U CN200994123Y CN 200994123 Y CN200994123 Y CN 200994123Y CN 200720033611 CN200720033611 CN 200720033611 CN 200720033611 U CN200720033611 U CN 200720033611U CN 200994123 Y CN200994123 Y CN 200994123Y
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- CN
- China
- Prior art keywords
- frequency
- module
- pass filter
- input
- frequency division
- Prior art date
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- Expired - Fee Related
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Abstract
The utility model discloses an automatic frequency tuner, which comprises a frequency comparator, an oscillator module, a module of brand pass filter and two frequency division modules. The output terminal of frequency comparator is respectively connected with the input terminals of oscillator module and the module of brand pass filter by leading wires. The input terminal of oscillator module is connected with the input terminal of one frequency division module and the output terminal of two frequency division module are connected with the output terminal of the frequency comparator by leading wire. A plurality of input terminals of base frequency are arranged on both two frequency division modules and the input terminal of base frequency is arranged on one of these two frequency division modules, meanwhile, frequency input terminal and frequency output terminal are arranged on brand pass filter. By making use of this automatic frequency tuner, working frequency and precision of frequency adjustment can be increased and using cost can be decreased. The utility model is applicable for tuning integrated circuit of radio frequency-middle frequency and middle frequency-audio frequency.
Description
Technical field
The utility model relates to a kind of frequency tuner that can carry out frequency tuning automatically.Be the automatic-frequency tuner in radio frequency-intermediate frequency, the intermediate frequency-audio tunning integrated circuit specifically.
Background technology
At present, commercially available radio frequency-intermediate frequency, intermediate frequency-audio tunning integrated circuit, its frequency tuning method mostly adopts at its mixing output pin and these the peripheral LC of increasing networks of frequency discrimination input pin, and by manual setting, makes each circuit be in the optimal tuning state.Though adopt this method can realize the adjustment of frequency, because each circuit all needs manual setting, not only inefficiency, precision are relatively poor, and need the extra pin definitions that increases.Owing to peripheral the increasing of integrated circuit the LC network is arranged, the components and parts that need are many again, and use cost is higher.
The utility model content
Problem to be solved in the utility model provides a kind of automatic-frequency tuner.Use this automatic-frequency tuner, can increase work efficiency and adjust precision, reduce use cost with frequency.
For addressing the above problem, take following technical scheme:
Automatic-frequency tuner of the present utility model, be characterized in forming by frequency comparator, oscillator module, band pass filter module and two frequency division modules, frequency comparator moral output links to each other with band pass filter module moral input with oscillator module respectively by lead, the output of oscillator module joins by the input of a lead and a frequency division module, and the output of two frequency division modules is connected with the input of frequency comparator by lead.Some reference frequency input ports are all arranged on two frequency division modules, the reference frequency input port is arranged on one of them frequency division module, and frequency input port and frequency output terminal mouth are arranged on the band pass filter.
Take such scheme, have the following advantages:
Because automatic-frequency tuner of the present utility model is made up of frequency comparator, oscillator module, band pass filter module and two frequency division modules, frequency comparator moral output links to each other with band pass filter module moral input with oscillator module respectively by lead, the output of oscillator module joins by the input of a lead and a frequency division module, and the output of two frequency division modules is connected with the input of frequency comparator by lead.Some reference frequency input ports are all arranged on two frequency division modules, the reference frequency input port is arranged on one of them frequency division module.And frequency input port and frequency output terminal mouth are arranged on the band pass filter.Adopt this structure, do not need mixing output pin and these the peripheral LC of increasing networks of frequency discrimination input pin, do not need additionally to increase pin definitions, need not carry out manual setting and just can realize the frequency adjustment at integrated circuit, not only tuning precision and operating efficiency can be improved, also use cost can be reduced.
Description of drawings
Accompanying drawing is an automatic-frequency tuner schematic diagram of the present utility model.
Embodiment
As shown in drawings, automatic-frequency tuner of the present utility model is made up of frequency comparator, oscillator module OSC, band pass filter module and two frequency division module DIV1 and DIV2, the output of frequency comparator links to each other with the input of band pass filter module with oscillator module OSC respectively by lead, the output of oscillator module OSC joins by the input of a lead and a frequency division module DIV1, and the output of two frequency division module DIV1 and DIV2 is connected with the input of frequency comparator by lead.On two frequency division module DIV1 and the DIV2 some reference frequency input port W1～Wn and a1～an are arranged respectively, reference frequency input signal Fref port is arranged on one of them frequency division module DIV2.And frequency input port Fin and frequency output terminal mouth Fout are arranged on the band pass filter.When work, the output signal of frequency comparator enters oscillator module OSC and band pass filter module by lead, and the output signal of oscillator module OSC enters frequency division module DIV1, and reference frequency input signal Fref enters frequency division module DIV2.The fractional frequency signal of frequency division module DIV1 and DIV2 enters the frequency comparator module, needs the signal Fin of filtering to enter band pass filter, obtains output signal Fout.
Wherein, the frequency of oscillation of oscillator module OSC can be designed to consistent with the band pass filter centre frequency.
By the closed loop feedback of frequency comparator output, come oscillator module OSC and band pass filter are adjusted by the error of two incoming frequencies, until making two frequency input signal unanimities of frequency comparator.
If the frequency dividing ratio of frequency division module DIV1 is n, the frequency dividing ratio of frequency division module DIV2 is m
The frequency that is oscillator module OSC can realize:
Minimum oscillation frequency is:
Maximum oscillation frequency:
f
A＝Fref×n
The centre frequency scope of the band pass filter that therefore, obtains simultaneously is:
So, can adjust different centre frequency fo with reference frequency input signal Fref by adjusting this frequency dividing ratio of m, n.If only require a kind of frequency-selective filtering of frequency, only fixedly m, n get final product needs.
Claims (1)
1. automatic-frequency tuner, it is characterized in that forming by frequency comparator, oscillator module (OSC), band pass filter module and two frequency division modules (DIV1 and DIV2), the output of frequency comparator links to each other with the input of oscillator module with the band pass filter module respectively by lead, the output of oscillator module (OSC) joins by the input of a lead and a frequency division module (DIV1), and the output of two frequency division modules (DIV1 and DIV2) is connected with the input of frequency comparator by lead; Some reference frequency input ports (W1～Wn or a1～an), on one of them frequency division module (DIV2) the reference frequency input port is arranged are all arranged on two frequency division modules (DIV1 and DIV2); And frequency input port (Fin) and frequency output terminal mouth (Fout) are arranged on the band pass filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200720033611 CN200994123Y (en) | 2007-01-15 | 2007-01-15 | Automatic frequency tuner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200720033611 CN200994123Y (en) | 2007-01-15 | 2007-01-15 | Automatic frequency tuner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200994123Y true CN200994123Y (en) | 2007-12-19 |
Family
ID=38947194
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200720033611 Expired - Fee Related CN200994123Y (en) | 2007-01-15 | 2007-01-15 | Automatic frequency tuner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN200994123Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102386890A (en) * | 2010-07-12 | 2012-03-21 | 瑞萨电子株式会社 | Automatic cutoff frequency adjusting circuit and portable digital assistant |
| CN102970053A (en) * | 2012-12-17 | 2013-03-13 | 中国科学院半导体研究所 | Wireless sensor network application-oriented low-power consumption radio frequency receiving and sending device |
| CN103809425A (en) * | 2014-01-27 | 2014-05-21 | 中国电子科技集团公司第十研究所 | Online calibration device and calibration method for atomic frequency standards |
-
2007
- 2007-01-15 CN CN 200720033611 patent/CN200994123Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102386890A (en) * | 2010-07-12 | 2012-03-21 | 瑞萨电子株式会社 | Automatic cutoff frequency adjusting circuit and portable digital assistant |
| CN102386890B (en) * | 2010-07-12 | 2016-01-27 | 瑞萨电子株式会社 | Cut-off frequency automatic circuit and portable information terminal |
| CN102970053A (en) * | 2012-12-17 | 2013-03-13 | 中国科学院半导体研究所 | Wireless sensor network application-oriented low-power consumption radio frequency receiving and sending device |
| CN102970053B (en) * | 2012-12-17 | 2015-05-20 | 中国科学院半导体研究所 | Wireless sensor network application-oriented low-power consumption radio frequency receiving and sending device |
| CN103809425A (en) * | 2014-01-27 | 2014-05-21 | 中国电子科技集团公司第十研究所 | Online calibration device and calibration method for atomic frequency standards |
| CN103809425B (en) * | 2014-01-27 | 2016-08-17 | 中国电子科技集团公司第十研究所 | The on-line calibration device of atomic frequency standard and calibration steps |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20071219 Termination date: 20150115 |
|
| EXPY | Termination of patent right or utility model |