CN101145815A - Frequency modulation signal automatic gain adjuster and adjustment method in channel share network - Google Patents
Frequency modulation signal automatic gain adjuster and adjustment method in channel share network Download PDFInfo
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- CN101145815A CN101145815A CNA2007101134770A CN200710113477A CN101145815A CN 101145815 A CN101145815 A CN 101145815A CN A2007101134770 A CNA2007101134770 A CN A2007101134770A CN 200710113477 A CN200710113477 A CN 200710113477A CN 101145815 A CN101145815 A CN 101145815A
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- automatic gain
- threshold value
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Abstract
The invention discloses an automatic gain regulator and a regulating method of the frequency-modulated signal in a channel shared network, which is to solve the problems of complex structure, high cost and small dynamic range of the prior art. The regulator comprises a zener diode that is used for breakdown under the determined voltage to clamp and output the frequency-modulated signal in a defined range; a voltage amplifier which is used to amplify the frequency-modulated signal output by the zener diode. The regulating method of the invention comprises that: first, a voltage threshold value is set; second, the voltage amplitude value of the input signal is judged whether it is larger than the threshold value or not. If being smaller than the threshold value, then the voltage amplitude value is output to the amplifier to be amplified; if larger than the threshold value, then the voltage amplitude value is chopped and output to the amplifier to be amplified. The circuit of the invention is simple in structure, and easy in realization of debugging; the dynamic range is wide, thereby being capable of realizing automatic gain control of the input signal in the large dynamic range from several millivolt to tens of volt.
Description
Technical field
The present invention relates to a kind of frequency modulation signal automatic gain adjuster, particularly frequency modulation signal automatic gain adjuster in the channel share network and method of adjustment.
Background technology
In the mutual communication process of each node of channel share networks such as wireless self-networking, wireless sensor network, 485 bus network and power carrier network, the signal amplitude that the node of close together receives on the physical location is big, the node received signal amplitude that distance is far away is little, and both differ thousands of times.For demodulator is effectively worked, the correct modulation signal that demodulates needs the adjustment that gains before the demodulation from modulation signal, and the amplitude of input signal is adjusted, and small-signal is amplified the large-signal decay.
Under the situation that input signal amplitude alters a great deal, require the gain of receiving circuit to adjust automatically, to keep output relatively stable with the signal power.The effect of automatic gain controller is exactly to make output signal keep suitable level, and being unlikely to because input signal is too little can't operate as normal, also is unlikely to make receiver take place saturated or obstruction because input signal is too big.So automatic gain controller is one of important circuit of communications receiving equipment.
Domestic theoretical research is in this respect carried out in a deep going way, but hardware circuit implementation ripe, that have practical value is also fewer, often has only principle to realize block diagram.Now disclosed method has following several: a kind of is that traditional multiplier principle of utilizing realizes automatic gain control circuit; Another kind is to adopt the integrated circuit operational transconductance amplifier; Be exactly the way that adopts automatic gaining controling chip and software to cooperate in addition.The overall more complicated of these methods, cost is higher, and reliability is not high enough, and dynamic range is big inadequately.
Summary of the invention
For overcoming above-mentioned defective, the object of the present invention is to provide a kind of simple in structure, cost is low, dynamic range is big channel share network frequency modulation signal automatic gain adjuster.
To achieve the above object of the invention, frequency modulation signal automatic gain adjuster in the channel share network of the present invention comprises at least: voltage stabilizing didoe in order to puncture, fixes on back output in institute's restricted portion with the FM signal pincers with input under the voltage of determining; Voltage amplifier is in order to amplify the FM signal of voltage stabilizing didoe output.
Further, also be provided with a voltage follower between described voltage stabilizing didoe and voltage amplifier, described voltage follower is realized with an amplifier.
Wherein, described amplifier is made up of dual-stage amplifier, and every grade of amplifying circuit multiplication factor is 100 times, adopts anti-phase input mode.
To achieve the above object of the invention, FM signal automatic gain method of adjustment in the channel share network of the present invention, 1) voltage threshold of setting; 2) whether the voltage magnitude of judging input signal, then exports amplifier to and amplifies if less than this threshold value greater than this threshold value; If greater than this threshold value, then it is cut and export amplifier to behind the top and amplify.
Wherein, above-mentioned voltage threshold is set by voltage stabilizing didoe, and comes the voltage magnitude of input is judged and controlled by voltage stabilizing didoe.
Further, above-mentioned step 2 is specially: whether the voltage magnitude of judging input signal, then exports amplifier to by voltage follower and amplifies if less than this threshold value greater than this threshold value; If greater than this threshold value, then it is cut the back, top and export the amplifier amplification to by voltage follower.
Wherein, above-mentioned voltage follower is realized with an amplifier.
Wherein, above-mentioned amplifier is made up of dual-stage amplifier, and every grade of amplifying circuit multiplication factor is 100 times, adopts anti-phase input mode.
Advantage of the present invention is:
1) simple.This circuit structure is simple, is easy to realization of debugging, thereby has stronger promotional value.
2) wide dynamic range.The energy realization is from the automatic gain adjustment of several millivolts to tens volts great dynamic range input signal.
3) effective.This circuit can realize effectively that amplitude output signal is in certain scope.
Description of drawings
Fig. 1 is that frequency modulation signal automatic gain adjuster of the present invention constitutes block diagram.
Fig. 2 is the physical circuit figure of pressure limiting, protection and follower.
Fig. 3 is the physical circuit figure of dual-stage amplifier.
Embodiment
Come the present invention is further described below in conjunction with the theoretical foundation of accompanying drawing, embodiment and invention.The theoretical foundation of institute of the present invention foundation is: for frequency modulation(FM) (frequency modulation), change in information changes frequency modulating signal, and the content of information is only relevant with the frequency of signal, and is irrelevant with the modulation signal amplitude.Promptly as long as frequency modulating signal does not change, the variation of signal amplitude can not influence the demodulation result of modulation signal.
FM signal automatic gain method of adjustment is in the channel share network of the present invention: 1) set a voltage threshold; 2) whether the voltage magnitude of judging input signal, then exports amplifier to and amplifies if less than this threshold value greater than this threshold value; If greater than this threshold value, then it is cut and export amplifier to behind the top and amplify.
The channel share network frequency modulation signal automatic gain adjuster that is used for that the present invention proposes is realized by voltage stabilizing didoe, voltage follower, dual-stage amplifier.
Fig. 1 has shown that the present invention is used for the formation block diagram of channel share network frequency modulation signal automatic gain adjuster, comprises a voltage stabilizing didoe, a voltage follower, a two-stage amplifying circuit.When the incoming signal level amplitude reaches tens volts, can absorb by voltage stabilizing didoe, limit its voltage, and the protection subsequent conditioning circuit, enter amplifying circuit then and amplify; When the incoming signal level amplitude was the millivolt level, voltage stabilizing didoe had no impact, and directly enters amplifying circuit, and signal is amplified to the volt level, thereby reached the purpose that automatic gain is adjusted.
Fig. 2 has shown the circuit diagram of pressure limiting, protection and follower.Form by a voltage stabilizing didoe, an integrated operational amplifier, a resistance, two electric capacity.The output of integrated operational amplifier links to each other with negative input end, constitutes feedback loop, and circuit is very simple.Wherein, voltage stabilizing didoe punctures under the voltage of determining, plays the effect of restriction and protection, can absorb instantaneous high voltage input, and input signal is fixed in certain scope by the voltage stabilizing didoe pincers.Voltage follower is realized with an amplifier.Voltage gain is approximately 1, plays buffering, isolates, improves load capacity.
Fig. 3 has shown the circuit diagram of two-stage amplifying circuit.Two-stage amplifying circuit circuit is similar, and every grade of amplifying circuit is made up of an integrated operational amplifier, several resistance and electric capacity.The voltage that integrated operational amplifier two inputs are raised is produced after to the power supply dividing potential drop by R5, R6, approximates E+/2; C2 is a filter capacitor; C1 and C3 are respectively input, output capacitance.In order to reduce the influence of input offset current, R1 should equal the value in parallel of R2 and R4, and this circuit is anti-phase input mode, the interchange multiplication factor of circuit be R4/R3=100 doubly.
To sum up, the present invention is based on the characteristics of FM signal, be different from traditional automatic gain controller, satisfy the automatic gain adjustment of several millivolts to tens volts great dynamic range input signal, overall structure is very simple, and cost is lower.
Claims (8)
1. frequency modulation signal automatic gain adjuster in the channel share network is characterized in that, comprises at least: voltage stabilizing didoe in order to puncturing, fixes on back output in institute's restricted portion with FM signal pincers that will input under the voltage of determining;
Voltage amplifier is in order to amplify the FM signal of voltage stabilizing didoe output.
2. frequency modulation signal automatic gain adjuster in the channel share network as claimed in claim 1 is characterized in that, also is provided with a voltage follower between described voltage stabilizing didoe and voltage amplifier, and described voltage follower is realized with an amplifier.
3. frequency modulation signal automatic gain adjuster in the channel share network as claimed in claim 1 or 2 is characterized in that described amplifier is made up of dual-stage amplifier, and every grade of amplifying circuit multiplication factor is 100 times, adopts anti-phase input mode.
4. FM signal automatic gain method of adjustment in the channel share network is characterized in that:
1) sets a voltage threshold;
2) whether the voltage magnitude of judging input signal, then exports amplifier to and amplifies if less than this threshold value greater than this threshold value; If greater than this threshold value, then it is cut and export amplifier to behind the top and amplify.
5. FM signal automatic gain method of adjustment in the channel share network as claimed in claim 4, it is characterized in that: above-mentioned voltage threshold is set by voltage stabilizing didoe, and comes the voltage magnitude of input is judged and controlled by voltage stabilizing didoe.
6. FM signal automatic gain method of adjustment in the channel share network as claimed in claim 4, it is characterized in that, described step 2 is specially: whether the voltage magnitude of judging input signal, then exports amplifier to by voltage follower and amplifies if less than this threshold value greater than this threshold value; If greater than this threshold value, then it is cut the back, top and export the amplifier amplification to by voltage follower.
7. FM signal automatic gain method of adjustment is characterized in that in the channel share network as claimed in claim 6, and described voltage follower is realized with an amplifier.
8. as FM signal automatic gain method of adjustment in claim 4, the 5 or 6 described channel share networks, it is characterized in that described amplifier is made up of dual-stage amplifier, every grade of amplifying circuit multiplication factor is 100 times, adopts anti-phase input mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101134770A CN101145815A (en) | 2007-10-24 | 2007-10-24 | Frequency modulation signal automatic gain adjuster and adjustment method in channel share network |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101134770A CN101145815A (en) | 2007-10-24 | 2007-10-24 | Frequency modulation signal automatic gain adjuster and adjustment method in channel share network |
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| CN101145815A true CN101145815A (en) | 2008-03-19 |
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| CNA2007101134770A Pending CN101145815A (en) | 2007-10-24 | 2007-10-24 | Frequency modulation signal automatic gain adjuster and adjustment method in channel share network |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102594300A (en) * | 2011-01-12 | 2012-07-18 | 富泰华工业（深圳）有限公司 | Light-operated signal generating circuit |
| CN112311421A (en) * | 2020-10-24 | 2021-02-02 | 青岛鼎信通讯股份有限公司 | Medium-voltage communication equipment receiving circuit based on AGC |
-
2007
- 2007-10-24 CN CNA2007101134770A patent/CN101145815A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102594300A (en) * | 2011-01-12 | 2012-07-18 | 富泰华工业（深圳）有限公司 | Light-operated signal generating circuit |
| CN112311421A (en) * | 2020-10-24 | 2021-02-02 | 青岛鼎信通讯股份有限公司 | Medium-voltage communication equipment receiving circuit based on AGC |
| CN112311421B (en) * | 2020-10-24 | 2022-02-01 | 青岛鼎信通讯股份有限公司 | Medium-voltage communication equipment receiving circuit based on AGC |
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Open date: 20080319 |