CN202978838U - Automatic gain controller used for short wave receiver - Google Patents
Automatic gain controller used for short wave receiver Download PDFInfo
- Publication number
- CN202978838U CN202978838U CN 201220662586 CN201220662586U CN202978838U CN 202978838 U CN202978838 U CN 202978838U CN 201220662586 CN201220662586 CN 201220662586 CN 201220662586 U CN201220662586 U CN 201220662586U CN 202978838 U CN202978838 U CN 202978838U
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- power
- gain amplifier
- intermediate frequency
- crystal filter
- variable gain
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Abstract
The utility model relates to a power detection and numerical control gain amplifier and especially relates to an automatic gain controller used for a short wave receiver. An intermediate frequency crystal filter I is connected with an intermediate frequency crystal filter II, a power protection circuit and a low-difference high-loss isolation power divider in order through a digital variable gain amplifier; the low-difference high-loss isolation power divider is connected with a radio frequency module controller and a digital variable gain amplifier in order through a power detection circuit. The automatic gain controller has advantages of low power, fast speed, no mechanical contact, small volume, long service life, simple circuit structure, small amount of occupied resources, high reliability, high gain, large dynamic scope, short control response time, digital control mode and more flexible application effects.
Description
Technical field
The utility model relates to a kind of power detection and Data control gain amplifier, particularly a kind of automatic gain controller for short-wave receiver.
Background technology
In some short-wave signals system, dynamic range very large (for example weather echo change in signal strength scope maximum can reach 115dB) due to echo-signal, in order to receive as far as possible reliably small-signal and not make the large-signal supersaturation produce distortion, this just requires receiver that large dynamic range is arranged.Realize dynamically can adopting greatly the method for logarithmic detector amplification, such as adopting the logarithmic detector chip, its dynamic range index can reach 100dB and 95dB on the chip handbook, but in system, the high-end part of logarithmic curve can not used, in order to satisfy the index of overall dynamic range, just begin to detect from the low side inelastic region of logarithmic curve.Due to the low side at logarithmic curve, detection efficiency is low, so the sensitivity of log channel will be affected.There is not this problem in linear the amplification, but linear circuit is complicated, cost is high, and will accomplish that linear dynamic range is high, do not affect again sensitivity, and this is difficult to.Automatic gain control circuit AGC can address this problem, and it can regulate the gain of amplifying circuit automatically according to the power of received signals, and during small-signal, gain greatly, gains during large-signal little, makes the power output of receiver substantially keep constant.But the AGC control precision that traditional aanalogvoltage is controlled is inadequate, and the reaction time is slow, is difficult to accomplish real-time control.
Summary of the invention
In view of the deficiency that prior art exists, the utility model provides a kind of automatic gain controller for short-wave receiver.
the utility model for achieving the above object, the technical scheme of taking is: a kind of automatic gain controller for short-wave receiver, it is characterized in that: comprise intermediate frequency crystal filter I, intermediate frequency crystal filter II, digital variable gain amplifier, power protecting circuit, low differential loss high-isolation power splitter, power-sensing circuit, the radio-frequency module controller, described intermediate frequency crystal filter I, by digital variable gain amplifier successively with intermediate frequency crystal filter II, power protecting circuit, low differential loss high-isolation power splitter connects, described low differential loss high-isolation power splitter by power-sensing circuit successively with the radio-frequency module controller, digital variable gain amplifier connects.
The beneficial effects of the utility model are: low in energy consumption, speed is fast, machinery-free contact, volume are little, long service life; Circuit structure is simple, it is few to take resource, and reliability is high; Gain high, dynamic range is large, controls the reaction time short, and is controlled by digital form, uses more flexible effect.
Description of drawings
Fig. 1 is that the utility model circuit connects block diagram.
Embodiment
as shown in Figure 1, the automatic gain controller (AGC) that is used for short-wave receiver, comprise intermediate frequency crystal filter I, intermediate frequency crystal filter II, digital variable gain amplifier, power protecting circuit, low differential loss high-isolation power splitter, power-sensing circuit, the radio-frequency module controller, described intermediate frequency crystal filter I, by digital variable gain amplifier successively with intermediate frequency crystal filter II, power protecting circuit, low differential loss high-isolation power splitter connects, described low differential loss high-isolation power splitter by power-sensing circuit successively with the radio-frequency module controller, digital variable gain amplifier connects.
operation principle: signal input port receives input signal, intermediate-freuqncy signal is input in digital variable gain amplifier by intermediate frequency crystal filter I (if bandpas filter), initialization is set to signal is carried out to a certain degree decay, the digital variable gain amplifier output signal is again by intermediate frequency crystal filter II, and designed a power protecting circuit in outlet, protection whole piece link is not burnt out by high-power signal, after processing by these some row, intermediate-freuqncy signal passes through the power splitter of a low differential loss high-isolation, the signal output port of leading up to output intermediate-freuqncy signal, one the tunnel inputs to power-sensing circuit, wherein, the power splitter power loss is-6dBm, power-sensing circuit is converted into intermediate-freuqncy signal the A/D acquisition interface that voltage signal inputs to the radio-frequency module controller, the radio-frequency module controller can according to gather to signal strength signal intensity calculate the signal strength signal intensity of intermediate frequency input signal, by corresponding computation of table lookup, digital variable gain amplifier is set, make the signal output of variable gain amplifier within certain power bracket.
Claims (1)
1. automatic gain controller that is used for short-wave receiver, it is characterized in that: comprise intermediate frequency crystal filter I, intermediate frequency crystal filter II, digital variable gain amplifier, power protecting circuit, low differential loss high-isolation power splitter, power-sensing circuit, the radio-frequency module controller, described intermediate frequency crystal filter I, by digital variable gain amplifier successively with intermediate frequency crystal filter II, power protecting circuit, low differential loss high-isolation power splitter connects, described low differential loss high-isolation power splitter by power-sensing circuit successively with the radio-frequency module controller, digital variable gain amplifier connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220662586 CN202978838U (en) | 2012-12-05 | 2012-12-05 | Automatic gain controller used for short wave receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220662586 CN202978838U (en) | 2012-12-05 | 2012-12-05 | Automatic gain controller used for short wave receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202978838U true CN202978838U (en) | 2013-06-05 |
Family
ID=48519857
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220662586 Expired - Fee Related CN202978838U (en) | 2012-12-05 | 2012-12-05 | Automatic gain controller used for short wave receiver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202978838U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104065408A (en) * | 2014-06-18 | 2014-09-24 | 重庆三峡学院 | Satellite signal repeater |
-
2012
- 2012-12-05 CN CN 201220662586 patent/CN202978838U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104065408A (en) * | 2014-06-18 | 2014-09-24 | 重庆三峡学院 | Satellite signal repeater |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130605 Termination date: 20131205 |