CN104201990A - Amplitude modulation demodulator - Google Patents
Amplitude modulation demodulator Download PDFInfo
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- CN104201990A CN104201990A CN201410413306.XA CN201410413306A CN104201990A CN 104201990 A CN104201990 A CN 104201990A CN 201410413306 A CN201410413306 A CN 201410413306A CN 104201990 A CN104201990 A CN 104201990A
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- operational amplifier
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- demodulator
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Abstract
The invention discloses an amplitude modulation demodulator. The amplitude modulation demodulator comprises an operational amplifier Q1 and an operational amplifier Q2, wherein a negative phase input end of the operational amplifier Q1 is connected with a demodulation signal input end through a resistor R1 and a capacitor C1, and connected with an output end of the operational amplifier Q1 through a resistor R2, a positive phase input end of the operational amplifier Q1 is connected with a power source through a resistor R3, and grounded through a capacitor C3 and a resistor R4 which are connected in parallel, a negative phase input end of the operational amplifier Q2 is connected with the output end of the operational amplifier Q1 through a resistor R5, a positive phase input end of the operational amplifier Q2 is respectively connected with one end of a resistor R7 and one end of a resistor R8 through a resistor R6, the other end of the resistor R7 is connected with the power source, the other end of the resistor R8 is grounded, and an output end of the operational amplifier Q2 is connected with a demodulation signal input end through a capacitor C2. The amplitude modulation demodulator is simple in structure, small in size, low in power consumption and strong in environmental adaptation.
Description
Technical field
The present invention relates to demodulation techniques field, in particular to a kind of AM demodulator.
Background technology
In oil, machinery, electric power all trades and professions, in various communications or treatment system, transmitting terminal is modulated carrier wave by the message that institute's tendency to develop is sent, and produces the signal that carries this message, and receiving terminal must recover transmitted message by demodulation and just can be used.Existing demodulator circuit designs according to modulator approach conventionally, can be divided into coherent demodulation method and irrelevant demodulation method, and coherent demodulation method is because its error rate is lower most widely used.
Traditional coherent demodulation method adopts low-pass filtering after need or being added carrier wave and signal multiplication, sampling judgement, more whether need decoding according to result identification.But the demodulator circuit structure of application the method design is comparatively complicated, volume is larger, power consumption is higher, be difficult to meet particular surroundings, as the circuit design demand under high temperature (more than 150 DEG C), vibration environment, and the method design circuit adaptability is poor, while changing element or transmission medium, often there is the problems such as the error rate is higher, and restituted signal is unreliable, for follow-up signal analyzing and processing is brought obstacle.
Summary of the invention
Technical problem to be solved by this invention is, the AM demodulator that a kind of circuit structure is simple, volume is little, low in energy consumption, environmental suitability is strong is provided.
Therefore, technical scheme of the present invention is as follows:
A kind of AM demodulator, comprise operational amplifier Q1 and operational amplifier Q2, the inverting input of operational amplifier Q1 is connected to restituted signal input by resistance R 1 and capacitor C 1, and be connected to the output of operational amplifier Q1 by resistance R 2, the normal phase input end of operational amplifier Q1 is connected to power supply by resistance R 3, and by the capacitor C 3 and resistance R 4 ground connection that are arranged in parallel, the inverting input of operational amplifier Q2 is connected to the output of operational amplifier Q1 by resistance R 5, the normal phase input end of operational amplifier Q2 is connected to respectively resistance R 7 and resistance R 8 by resistance R 6, the other end of resistance R 7 is connected to described power supply, the other end ground connection of resistance R 8, the output of operational amplifier Q2 is connected to restituted signal output by capacitor C 2.
The bandwidth of operational amplifier Q1 is less than 1.5MHz.
AM demodulator of the present invention can be realized the effective demodulation to envelope signal, and reliability is high, greatly simplify demodulator circuit design, this demodulator has that volume is little, low in energy consumption, stable performance, the advantage such as easy to maintenance, and avoid the special high temperature resistant integrated circuit of communication to be difficult to the technical barrier of design, thereby effectively improved the adaptability of whole device to high temperature; This solution demodulator strong robustness, can solve the impact causing because of system parameter variations effectively, has removed the process that debugging connects from, meets the communication requirement of most of equipment, strong adaptability.
Brief description of the drawings
Fig. 1 is according to the electrical block diagram of the AM demodulator of the embodiment of the present invention;
Fig. 2 is according to the signal schematic representation after the AM demodulator demodulation of the embodiment of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.It should be noted that, in the situation that not conflicting, the feature in the application's embodiment and embodiment can combine mutually.
As depicted in figs. 1 and 2, AM demodulator according to an embodiment of the invention, comprise operational amplifier Q1 and operational amplifier Q2, the inverting input of operational amplifier Q1 is connected to restituted signal input by resistance R 1 and capacitor C 1, and be connected to the output of operational amplifier Q1 by resistance R 2, the normal phase input end of operational amplifier Q1 is connected to power supply by resistance R 3, and by the capacitor C 3 and resistance R 4 ground connection that are arranged in parallel, the inverting input of operational amplifier Q2 is connected to the output of operational amplifier Q1 by resistance R 5, the normal phase input end of operational amplifier Q2 is connected to respectively resistance R 7 and resistance R 8 by resistance R 6, the other end of resistance R 7 is connected to described power supply, the other end ground connection of resistance R 8, the output of operational amplifier Q2 is connected to restituted signal output by capacitor C 2.
The bandwidth of operational amplifier Q1 is less than 1.5MHz.
In this technical scheme, can realize the effective demodulation to envelope signal, and reliability is high, greatly simplify demodulator circuit design, adopt that the demodulator of this demodulator circuit has that volume is little, low in energy consumption, stable performance, the advantage such as easy to maintenance, and avoid the special high temperature resistant integrated circuit of communication to be difficult to the technical barrier of design, thereby effectively improved the adaptability of whole device to high temperature; Apply the demodulator strong robustness of this demodulator circuit, can effectively solve the impact causing because of system parameter variations, removed the process that debugging connects from, meet the communication requirement of most of equipment, strong adaptability.
This demodulator adopts single supply dual operational amplifier to carry out Amplitude Modulation and Demodulation Instrument circuit design, utilize the response characteristic of operational amplifier to high frequency, operational amplifier Q1 amplifies input envelope signal and is converted into approximate square-wave signal, theory signal enlargement ratio is R2/R1, and operational amplifier Q2, as comparator, deflects operational amplifier Q1 output signal, be converted into the regular square-wave signal without negative half period, remove and disturb, complete demodulating process, turnover voltage is determined by R7, R8 value.In the time of design demodulator, should, according to characteristics of signals and demodulation demand, with reference to the frequency response characteristic of operational amplifier own, select at required high band and not respond or respond very low operational amplifier, it is good that the bandwidth of operational amplifier Q1 is less than 1.5MHz.
Input signal strength, frequency and demodulation follow-up data processing demands are depended in the selection of operational amplifier Q1, Q2 and R1, R2, R7, R8, C1, C2.When Selecting operation amplifier, the frequency response characteristic of contrast operational amplifier, selects at required high band and does not respond or respond very low operational amplifier, and the operational amplifier multiplication factor of selected circuit should be greater than calculated value.
In sum, content of the present invention is not limited in the above-described embodiment, and those skilled in the art can propose other embodiment within technological guidance's thought of the present invention, but this embodiment comprises within the scope of the present invention.
Claims (2)
1. an AM demodulator, it is characterized in that, comprise operational amplifier Q1 and operational amplifier Q2, the inverting input of operational amplifier Q1 is connected to restituted signal input by resistance R 1 and capacitor C 1 and is connected to the output of operational amplifier Q1 by resistance R 2; The normal phase input end of operational amplifier Q1 is connected to power supply by resistance R 3 and by the capacitor C 3 and resistance R 4 ground connection that are arranged in parallel, the inverting input of operational amplifier Q2 is connected to the output of operational amplifier Q1 by resistance R 5, the normal phase input end of operational amplifier Q2 is connected to respectively resistance R 7 and resistance R 8 by resistance R 6, the other end of resistance R 7 is connected to described power supply, the other end ground connection of resistance R 8, the output of operational amplifier Q2 is connected to restituted signal output by capacitor C 2.
2. AM demodulator according to claim 1, is characterized in that, the bandwidth of operational amplifier Q1 is less than 1.5MHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410413306.XA CN104201990A (en) | 2014-08-20 | 2014-08-20 | Amplitude modulation demodulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410413306.XA CN104201990A (en) | 2014-08-20 | 2014-08-20 | Amplitude modulation demodulator |
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| Publication Number | Publication Date |
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| CN104201990A true CN104201990A (en) | 2014-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410413306.XA Pending CN104201990A (en) | 2014-08-20 | 2014-08-20 | Amplitude modulation demodulator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107271494A (en) * | 2017-05-25 | 2017-10-20 | 杭州美仪自动化有限公司 | A kind of resistivity sample circuit of the aqueous solution |
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| US20120068550A1 (en) * | 2009-05-25 | 2012-03-22 | Koninklijke Philips Electronics N.V. | Method and device for detecting a device in a wireless power transmission system |
| CN202663289U (en) * | 2012-04-01 | 2013-01-09 | 武汉永力电源技术有限公司 | Single-cycle PWM (Pulse-Width Modulation) modulator for correcting power factor |
| CN103684341A (en) * | 2013-11-28 | 2014-03-26 | 成都位时通科技有限公司 | Filter demodulator with excellent performance |
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2014
- 2014-08-20 CN CN201410413306.XA patent/CN104201990A/en active Pending
Patent Citations (6)
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| CN2200260Y (en) * | 1993-11-18 | 1995-06-07 | 刘家伟 | Public communication code device for channel |
| CN1258393A (en) * | 1998-01-22 | 2000-06-28 | 皇家菲利浦电子有限公司 | PWM amplifier |
| CN200956557Y (en) * | 2006-07-08 | 2007-10-03 | 漳州科华技术有限责任公司 | Inverter output waveform symmetrical correcting device |
| US20120068550A1 (en) * | 2009-05-25 | 2012-03-22 | Koninklijke Philips Electronics N.V. | Method and device for detecting a device in a wireless power transmission system |
| CN202663289U (en) * | 2012-04-01 | 2013-01-09 | 武汉永力电源技术有限公司 | Single-cycle PWM (Pulse-Width Modulation) modulator for correcting power factor |
| CN103684341A (en) * | 2013-11-28 | 2014-03-26 | 成都位时通科技有限公司 | Filter demodulator with excellent performance |
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| ZHOUBM304: "常用运放电路", 《URL：HTTP://WENKU.BAIDU.COM/LINK?URL=LTDTBYFUJ0WDI4H8LGJFUS56UJ59OUCDNQJIPHWH9CMCBZIPRQ1FN8-4EGF3DXH13E8V6RHSKGD8ZIGTZIVQL8HTXUJKPASQVUNNOTAQZBW》 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107271494A (en) * | 2017-05-25 | 2017-10-20 | 杭州美仪自动化有限公司 | A kind of resistivity sample circuit of the aqueous solution |
| CN107271494B (en) * | 2017-05-25 | 2019-06-11 | 杭州美仪自动化有限公司 | A kind of resistivity sample circuit of aqueous solution |
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Application publication date: 20141210 |