CN101155000B - Anti-interference intermediate frequency signal conditioner - Google Patents
Anti-interference intermediate frequency signal conditioner Download PDFInfo
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- CN101155000B CN101155000B CN2007100307005A CN200710030700A CN101155000B CN 101155000 B CN101155000 B CN 101155000B CN 2007100307005 A CN2007100307005 A CN 2007100307005A CN 200710030700 A CN200710030700 A CN 200710030700A CN 101155000 B CN101155000 B CN 101155000B
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Abstract
The present invention is an intermediate frequency signal regulating device used in the strong interference occasion. The invention includes an amplifier (1), a rectifier (2), a filtering and amplifying circuit (3), a triangular-wave generator (4), a PWM synthesizing circuit (5) and a difference output circuit (6), wherein the input end of the amplifier (1) is connected with the input port of the intermediate frequency signal, the input end of the rectifier (2) is connected with the output end of the amplifier (1), the input end of the filtering and amplifying circuit (3) is connected with the output end of the rectifier (2), the output end of the filtering and amplifying circuit (3) is connected with the output end of the triangular-wave generator (4) and the input end of the PWM synthesizing circuit (5), and the output end of the PMW synthesizing circuit (5) is connected with the input end of the output circuit (6). The invention not only increases the anti-interference faculty of the small signal but also effectively avoid the disturbance of interfering signal with specific frequency. The invention has the advantages of simple structure, easy using, high switching speed and high precision, and the invention can be used to the occasion of transmitting the strong anti-interference alternating current and direct current signals.
Description
Technical field:
The present invention is a kind of intermediate-freuqncy signal conditioning device that is used for the strong jamming occasion, belongs to the renovation technique of strong jamproof intermediate-freuqncy signal conditioning device.
Background technology:
Have the occasion of interference signals such as intermediate frequency magnetic field at Medical Devices and nuclear-magnetism checkout equipment etc., control appliances such as computer need be away from interference source, and some on-the-spot detection signals also can be subjected to serious disturbance when transmission.In order to make the signal reliable transmission, especially long apart from the time, must overcome this interference.Existing processing method can have following several: 1) adopt the transmission of direct intermediate-freuqncy signal, directly carry out digital processing after being changed by A/D, but detect if any multiple signals, then the speed of A/D converter and computer is all had relatively high expectations, and is difficult to reach.2) after the accurate full-wave rectification of employing intermediate-freuqncy signal, directly transmit, but when detecting small-signal, can be subjected to bigger influence.3) after the accurate full-wave rectification of employing intermediate-freuqncy signal, it is carried out the V/F conversion, become frequency signal and transmit, but when becoming a certain frequency signal, also can be subjected to bigger interference effect.
Summary of the invention:
The objective of the invention is to consider the problems referred to above and a kind of antijamming capability not only can improve small-signal the time is provided, can also avoid the strong jamproof intermediate-freuqncy signal conditioning device of some certain interference frequency.The present invention is simple in structure, easy to use, conversion speed is fast, precision is higher.Can be applied to the occasion of the strong jamproof AC and DC signal transmission of various needs.
Theory diagram of the present invention as shown in Figure 1, include amplifier, rectifier, filtering and amplifying circuit, triangular-wave generator, the PWM combiner circuit, differential output circuit, wherein the amplifier input terminal that signal is amplified is connected with the input port of intermediate-freuqncy signal, the input that signal is become the rectifier of direct current signal is connected with the output of amplifier, signal is become the filtering of direct current signal stably and the input of amplifying circuit is connected with the output of rectifier, the output of filtering and amplifying circuit and the output of triangular-wave generator with signal is synthesized the input of duty ratio and is connected according to the PWM combiner circuit of the signal of direct current signal variable size, the output of PWM combiner circuit with the differential amplification output of signal, the input of the differential output circuit of the antijamming capability of raising signal connects.
Above-mentioned amplifier includes amplifier U1, resistance R 1, R2, capacitor C 1, variable resistor WR1, wherein the positive input terminal of amplifier U1 and negative input end are connected with the input port of intermediate-freuqncy signal by resistance R 1, R2 respectively, resistance R 17 is connected with positive input terminal and the power supply ground of amplifier U1 respectively, and capacitor C 1 and variable resistor WR1 are connected in parallel between the negative input end and output of amplifier U1.
Above-mentioned rectifier includes amplifier U2A, U2B, resistance R 3～R9, capacitor C 2, diode D1, D2, amplifier U2A wherein, the positive input terminal of U2B is respectively by resistance R 4, R8 is connected with the output of amplifier U1, the negative input end of amplifier U2A is crossed resistance R 3 ground connection, the series circuit that series circuit that resistance R 6 and diode D1 form and resistance R 5 and diode D2 form is connected in parallel between the negative input end and output of amplifier U2A, the negative input end of amplifier U2B is connected with the anode of diode D2 by resistance R 7, and capacitor C 2 and resistance R 9 are connected in parallel between the negative input end and output of amplifier U2B.
Above-mentioned filtering and amplifying circuit include amplifier U3B, resistance R 10, R11, R12, capacitor C 3, C4, C5, variable resistor WR3, wherein the positive input terminal of amplifier U3B is by resistance R 12 ground connection, negative input end is connected with the output of amplifier U2B by resistance R 11 and is connected the other end ground connection of capacitor C 3, C4 respectively with the end of capacitor C 3, C4; Capacitor C 5 and variable resistor WR3 are connected in parallel between the negative input end and output of amplifier U3B.
Above-mentioned triangular-wave generator includes amplifier U3C, U3D, resistance R 13, R14, R15, capacitor C 6, variable resistor WR4, the negative input end ground connection of the positive input terminal of amplifier U3C and amplifier U3D wherein, the negative input end of amplifier U3C is connected with the output of amplifier U3D by variable resistor WR4 and resistance R 15, capacitor C 6 is connected in parallel between the negative input end and output of amplifier U3C, resistance R 14 is connected in parallel between the positive input terminal and output of amplifier U3D, and resistance R 13 is connected in parallel between the output of the positive input terminal of amplifier U3D and amplifier U3C.
The said PWM combiner circuit is amplifier U3A.
Above-mentioned differential output circuit includes differentiator U4 and resistance R 16, and the input of differentiator U4 is connected with the output of amplifier U3A by resistance R 16.
The present invention is owing to adopt the structure that includes amplifier, rectifier, filtering and amplifying circuit, triangular-wave generator, PWM combiner circuit, differential output circuit, intermediate-freuqncy signal is delivered to rectifier with output signal behind amplifier, become direct current signal, be output as direct current signal stably by filtering and amplifying circuit again, the output of filtering and amplifying circuit and the output of frequency generator synthesize the signal of duty ratio according to the direct current signal variable size through the PWM combiner circuit, through the differential amplification output of differential output circuit, further improve the antijamming capability of signal at last.Therefore, the antijamming capability when the present invention not only can improve small-signal can also avoid some certain interference frequency anti-interference by force.The present invention is simple in structure, easy to use, conversion speed is fast, precision is higher, can be applied to the occasion of the strong jamproof AC and DC signal transmission of various needs.The present invention is a kind of convenient and practical strong jamproof intermediate-freuqncy signal conditioning device.
Description of drawings:
Fig. 1 is a theory diagram of the present invention;
Fig. 2 is a circuit diagram of the present invention.
Embodiment:
Embodiment:
Theory diagram of the present invention as shown in Figure 1, include amplifier 1, rectifier 2, filtering and amplifying circuit 3, triangular-wave generator 4, PWM combiner circuit 5, differential output circuit 6, wherein the input of amplifier 1 is connected with the input port of intermediate-freuqncy signal, the input of rectifier 2 is connected with the output of amplifier 1, the input of filtering and amplifying circuit 3 is connected with the output of rectifier 2, the output of the output of filtering and amplifying circuit 3 and triangular-wave generator 4 is connected with the input of PWM combiner circuit 5, and the output of PWM combiner circuit 5 is connected with the input of differential output circuit 6.
Circuit diagram of the present invention as shown in Figure 2, in the present embodiment, above-mentioned amplifier 1 includes amplifier U1, resistance R 1, R2, capacitor C 1, variable resistor WR1, wherein the positive input terminal of amplifier U1 and negative input end are connected with the input port of intermediate-freuqncy signal by resistance R 1, R2 respectively, resistance R 17 is connected with positive input terminal and the power supply ground of amplifier U1 respectively, and capacitor C 1 and variable resistor WR1 are connected in parallel between the negative input end and output of amplifier U1.
Above-mentioned rectifier 2 includes amplifier U2A, U2B, resistance R 3～R9, capacitor C 2, diode D1, D2, amplifier U2A wherein, the positive input terminal of U2B is respectively by resistance R 4, R8 is connected with the output of amplifier U1, the negative input end of amplifier U2A is crossed resistance R 3 ground connection, the series circuit that series circuit that resistance R 6 and diode D1 form and resistance R 5 and diode D2 form is connected in parallel between the negative input end and output of amplifier U2A, the negative input end of amplifier U2B is connected with the anode of diode D2 by resistance R 7, and capacitor C 2 and resistance R 9 are connected in parallel between the negative input end and output of amplifier U2B.
Above-mentioned filtering and amplifying circuit 3 include amplifier U3B, resistance R 10, R11, R12, capacitor C 3, C4, C5, variable resistor WR3, wherein the positive input terminal of amplifier U3B is by resistance R 12 ground connection, negative input end is connected with the output of amplifier U2B by resistance R 11 and is connected the other end ground connection of capacitor C 3, C4 respectively with the end of capacitor C 3, C4; Capacitor C 5 and variable resistor WR3 are connected in parallel between the negative input end and output of amplifier U3B.
Above-mentioned triangular-wave generator 4 includes amplifier U3C, U3D, resistance R 13, R14, R15, capacitor C 6, variable resistor WR4, the negative input end ground connection of the positive input terminal of amplifier U3C and amplifier U3D wherein, the negative input end of amplifier U3C is connected with the output of amplifier U3D by variable resistor WR4 and resistance R 15, capacitor C 6 is connected in parallel between the negative input end and output of amplifier U3C, resistance R 14 is connected in parallel between the positive input terminal and output of amplifier U3D, and resistance R 13 is connected in parallel between the output of the positive input terminal of amplifier U3D and amplifier U3C.
Said PWM combiner circuit 5 is amplifier U3A.
Above-mentioned differential output circuit 6 includes differentiator U4 and resistance R 16, and the input of differentiator U4 is connected with the output of amplifier U3A by resistance R 16.
When the present invention works, intermediate-freuqncy signal is delivered to output signal accurate full-wave rectifier 2 behind amplifier 1, become direct current signal, be output as direct current signal stably by filtering and amplifying circuit 3 again, the frequency of triangular-wave generator 4 can avoid producing the frequency separation of interference, the output of the output of filtering and amplifying circuit 4 and triangular-wave generator 4 synthesizes the signal of duty ratio according to the direct current signal variable size through PWM combiner circuit 5, through the differential amplification output of differential output circuit 6, further improve the antijamming capability of signal at last.At computer terminal, can adopt the method that regularly detects, obtain the duty ratio of signal, thereby detect the effective value of intermediate-freuqncy signal.
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100307005A CN101155000B (en) | 2007-09-30 | 2007-09-30 | Anti-interference intermediate frequency signal conditioner |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100307005A CN101155000B (en) | 2007-09-30 | 2007-09-30 | Anti-interference intermediate frequency signal conditioner |
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| CN101155000A CN101155000A (en) | 2008-04-02 |
| CN101155000B true CN101155000B (en) | 2010-12-15 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101793114B (en) * | 2010-01-14 | 2013-01-23 | 杭州六易科技有限公司 | Signal encryption type safety remote control lock for automobiles |
| CN101761271A (en) * | 2010-01-14 | 2010-06-30 | 杭州六易科技有限公司 | Frequency mixing anti-jamming type automobile safe remote control lock |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2520612Y (en) * | 2002-02-08 | 2002-11-13 | 西安蓝芽通信设备有限责任公司 | Radio spectrum spread apparatus |
| CN2524434Y (en) * | 2002-02-06 | 2002-12-04 | 信息产业部电子第五十四研究所 | Spread spectrum modem |
| CN1413387A (en) * | 1999-10-22 | 2003-04-23 | 艾利森电话股份有限公司 | Communication terminal having receiver and method for removing known interferers from digitized intermediate frequency signal |
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- 2007-09-30 CN CN2007100307005A patent/CN101155000B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1413387A (en) * | 1999-10-22 | 2003-04-23 | 艾利森电话股份有限公司 | Communication terminal having receiver and method for removing known interferers from digitized intermediate frequency signal |
| CN2524434Y (en) * | 2002-02-06 | 2002-12-04 | 信息产业部电子第五十四研究所 | Spread spectrum modem |
| CN2520612Y (en) * | 2002-02-08 | 2002-11-13 | 西安蓝芽通信设备有限责任公司 | Radio spectrum spread apparatus |
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Address after: Guangdong province Guangzhou City Hai road 511450 Panyu District Shiji Town, South Wing Industrial Zone No. 109 Patentee after: Guangzhou Hao Yang electronic Limited by Share Ltd Address before: Guangdong province Guangzhou City Hai road 511450 Panyu District Shiji Town, South Wing Industrial Zone No. 109 Patentee before: Guangzhou Haoyang Electronics Co., Ltd. |
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