CN104469043A - Modem circuit for remote terminal management system - Google Patents
Modem circuit for remote terminal management system Download PDFInfo
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- CN104469043A CN104469043A CN201410719734.5A CN201410719734A CN104469043A CN 104469043 A CN104469043 A CN 104469043A CN 201410719734 A CN201410719734 A CN 201410719734A CN 104469043 A CN104469043 A CN 104469043A
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- triode
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- controlled oscillator
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Abstract
The invention discloses a modem circuit for a remote terminal management system. The modem circuit comprises a first capacitor, a second capacitor, a third capacitor, a direct current power source, a phase locking integrated chip, an amplifier, voltage-controlled oscillator, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first triode, a second triode, a third triode, a fourth triode, a fifth triode, a first potentiometer, a second potentiometer and a diode. Compared with the prior art, the voltage-controlled oscillator of the modem circuit for the remote terminal management system is used for receiving a digital signal from data terminal equipment and carrying out FSK modulation, the signal frequency can be adjusted finely through the first potentiometer and the second potentiometer, and the phase locking integrated chip is used for receiving a transmitted FSK modulation signal which is then converted into the digital data format capable of being identified by the data terminal equipment. The modem circuit for the remote terminal management system is good in working stability, convenient to use, simple in structure and low in manufacturing cost, and has high popularization and promotion value.
Description
Technical field
The present invention relates to a kind of modem circuit, particularly relate to a kind of modem circuit for remote management of CPE system.
Background technology
Remote management of CPE system mainly provide system manager one very easily shortcut visit long-range device systems, use the function of remote console managerment, the mode that system manager can utilize the phone of modulator-demodulator to dial in, be relatively easy to set up and configuration network from control centre, the modem circuit job stability for remote management of CPE system is now poor, often can not dial, and cost of manufacture is higher, adds the use cost of user.
Summary of the invention
Object of the present invention is just to provide a kind of modem circuit for remote management of CPE system to solve the problem.
The present invention is achieved through the following technical solutions above-mentioned purpose:
The present invention includes the first electric capacity to the 3rd electric capacity, DC power supply, phase-locked integrated chip, amplifier, voltage controlled oscillator, first resistance is to the tenth resistance, first triode is to the 5th triode, first potentiometer, second potentiometer and diode, the positive pole of described DC power supply simultaneously with the first end of described first resistance, the first end of described second resistance, the first end of described 3rd resistance, the first end of described first potentiometer, 16 pin of described voltage controlled oscillator, tenth pin of described phase-locked integrated chip, the first end of described first electric capacity is connected with the cathode power supply end of described amplifier, the crus secunda of described phase-locked integrated chip is the first signal input part of described modem circuit, the tripod of described phase-locked integrated chip, the emitter of described first triode and the equal ground connection of the second end of described first potentiometer, the octal of described phase-locked integrated chip is connected with the second end of described second resistance and the emitter of described second triode simultaneously, the collector electrode of described second triode is connected with the second end of described 3rd resistance, the base stage of described second triode is connected with the second end of described first resistance and the collector electrode of described first triode simultaneously, the base stage of described first triode is connected with the first end of described 4th resistance, 9th pin of described phase-locked integrated chip is connected with the first end of described second electric capacity, second end of described second electric capacity simultaneously with the first pin of described phase-locked integrated chip, the negative electricity source of described amplifier is connected with the negative pole of described DC power supply, 7th pin of described phase-locked integrated chip is connected with the second end of described first electric capacity and the in-phase input end of described amplifier simultaneously, 6th pin of described phase-locked integrated chip is connected with the inverting input of described amplifier, the output of described amplifier is the first signal output part of described modem circuit, 4th pin of described voltage controlled oscillator is the secondary signal output of described modem circuit, 7th pin of described voltage controlled oscillator is connected with the first end of described 3rd electric capacity, second end of described 3rd electric capacity is connected with the 6th pin of described voltage controlled oscillator, the octal of described voltage controlled oscillator simultaneously with the 5th pin of described voltage controlled oscillator, the first end of described tenth resistance is connected with the emitter of described 5th triode and ground connection, 11 pin of described voltage controlled oscillator is connected with the second end of described tenth resistance and the first end of described 9th resistance simultaneously, second end of described 9th resistance is connected with the collector electrode of described 5th triode, the base stage of described 5th triode is connected with the second end of described 4th resistance, 9th pin of described voltage controlled oscillator is connected with the first end of described 8th resistance and the collector electrode of described 4th triode simultaneously, second end of described 8th resistance is connected with the sliding end of described first potentiometer, the emitter of described 4th triode is connected with the first end of described second potentiometer, second end of described second potentiometer simultaneously with the sliding end of described second potentiometer, the emitter of described 3rd triode, the positive pole of described diode is connected with the first end of described 6th resistance and ground connection, the collector electrode of described 3rd triode is connected with the second end of described 7th resistance and the base stage of described 4th triode simultaneously, the base stage of described 3rd triode simultaneously with the negative pole of described diode, second end of described 6th resistance is connected with the first end of described 5th resistance, second end of described 5th resistance is the secondary signal input of described modem circuit.
Further, the model that described phase-locked integrated chip is selected is LM565, and the model that described voltage controlled oscillator is selected is MQE920.
Beneficial effect of the present invention is:
Modem circuit for remote management of CPE system of the present invention, wherein voltage controlled oscillator is used for receiving the digital signal from data terminal equipment, and carry out FSK modulation, by the first potentiometer and the fine-tuning signal frequency of the second potentiometer, phase-locked integrated chip is used for receiving the fsk modulated signal sent, then converting to can by the digital data format of data terminal equipment identification, better working stability, easy to use, and structure is simple, cost of manufacture is lower, has the value of higher penetration and promotion.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the modem circuit for remote management of CPE system of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
As shown in Figure 1, the present invention includes the first electric capacity C1 to the 3rd electric capacity C3, DC power supply DC, phase-locked integrated chip IC1, amplifier IC2, voltage controlled oscillator IC3, first resistance R1 is to the tenth resistance R10, first triode Q1 is to the 5th triode Q5, first potentiometer W1, second potentiometer W2 and diode D, the positive pole of DC power supply DC simultaneously with the first end of the first resistance R1, the first end of the second resistance R2, the first end of the 3rd resistance R3, the first end of the first potentiometer W1, 16 pin of voltage controlled oscillator IC3, tenth pin of phase-locked integrated chip IC1, the first end of the first electric capacity C1 is connected with the cathode power supply end of amplifier IC2, the crus secunda of phase-locked integrated chip IC1 is the first signal input part of modem circuit, the tripod of phase-locked integrated chip IC1, the emitter of the first triode Q1 and the equal ground connection of the second end of the first potentiometer W1, the octal of phase-locked integrated chip IC1 is connected with second end of the second resistance R2 and the emitter of the second triode Q2 simultaneously, the collector electrode of the second triode Q2 is connected with second end of the 3rd resistance R3, the base stage of the second triode Q2 is connected with second end of the first resistance R1 and the collector electrode of the first triode Q1 simultaneously, the base stage of the first triode Q1 is connected with the first end of the 4th resistance R4, 9th pin of phase-locked integrated chip IC1 is connected with the first end of the second electric capacity C2, second end of the second electric capacity C2 simultaneously with first pin of phase-locked integrated chip IC1, the negative electricity source of amplifier IC2 is connected with the negative pole of DC power supply DC, 7th pin of phase-locked integrated chip IC1 is connected with second end of the first electric capacity C1 and the in-phase input end of amplifier IC2 simultaneously, 6th pin of phase-locked integrated chip IC1 is connected with the inverting input of amplifier IC2, the output of amplifier IC2 is the first signal output part of modem circuit, 4th pin of voltage controlled oscillator IC3 is the secondary signal output of modem circuit, 7th pin of voltage controlled oscillator IC3 is connected with the first end of the 3rd electric capacity C3, second end of the 3rd electric capacity C3 is connected with the 6th pin of voltage controlled oscillator IC3, the octal of voltage controlled oscillator IC3 simultaneously with the 5th pin of voltage controlled oscillator IC3, the first end of the tenth resistance R10 is connected with the emitter of the 5th triode Q5 and ground connection, 11 pin of voltage controlled oscillator IC3 is connected with second end of the tenth resistance R10 and the first end of the 9th resistance simultaneously, second end of the 9th resistance is connected with the collector electrode of the 5th triode Q5, the base stage of the 5th triode Q5 is connected with second end of the 4th resistance R4, 9th pin of voltage controlled oscillator IC3 is connected with the first end of the 8th resistance and the collector electrode of the 4th triode Q4 simultaneously, second end of the 8th resistance is connected with the sliding end of the first potentiometer W1, the emitter of the 4th triode Q4 is connected with the first end of the second potentiometer W2, second end of the second potentiometer W2 simultaneously with the sliding end of the second potentiometer W2, the emitter of the 3rd triode Q3, the positive pole of diode D is connected with the first end of the 6th resistance R6 and ground connection, the collector electrode of the 3rd triode Q3 is connected with the second end of the 7th resistance and the base stage of the 4th triode Q4 simultaneously, the base stage of the 3rd triode Q3 simultaneously with the negative pole of diode D, second end of the 6th resistance R6 is connected with the first end of the 5th resistance R5, second end of the 5th resistance R5 is the secondary signal input of modem circuit.
Modem circuit for remote management of CPE system of the present invention, the model that wherein phase-locked integrated chip IC1 selects is LM565, the model that voltage controlled oscillator IC3 selects is MQE920, voltage controlled oscillator IC3 is used for receiving the numerical data from DTE (data terminal equipment), and carry out FSK modulation, mainly be used as conveyer to use, numerical data is through level adjusting circuit, then the control voltage input pin (pin 9) of voltage controlled oscillator is sent to, first potentiometer W1 and the second potentiometer W2 is used for the high level of tuning control voltage and low level, to finely tune frequency, phase-locked integrated chip IC1 is used for receiving the fsk modulated signal sent, then the digital data format that can be identified by DTE is converted to, when modulator-demodulator is in initiation pattern, phase-locked integrated chip IC1 can wait for and receive the data that the modulator-demodulator that is positioned at response modes from another one transmits, on the other hand, when modulator-demodulator is positioned at response modes, phase-locked integrated chip IC1 can receive the data that the modulator-demodulator that is in initiation pattern from another one transmits.
Claims (2)
1. the modem circuit for remote management of CPE system, it is characterized in that: comprise the first electric capacity to the 3rd electric capacity, DC power supply, phase-locked integrated chip, amplifier, voltage controlled oscillator, first resistance is to the tenth resistance, first triode is to the 5th triode, first potentiometer, second potentiometer and diode, the positive pole of described DC power supply simultaneously with the first end of described first resistance, the first end of described second resistance, the first end of described 3rd resistance, the first end of described first potentiometer, 16 pin of described voltage controlled oscillator, tenth pin of described phase-locked integrated chip, the first end of described first electric capacity is connected with the cathode power supply end of described amplifier, the crus secunda of described phase-locked integrated chip is the first signal input part of described modem circuit, the tripod of described phase-locked integrated chip, the emitter of described first triode and the equal ground connection of the second end of described first potentiometer, the octal of described phase-locked integrated chip is connected with the second end of described second resistance and the emitter of described second triode simultaneously, the collector electrode of described second triode is connected with the second end of described 3rd resistance, the base stage of described second triode is connected with the second end of described first resistance and the collector electrode of described first triode simultaneously, the base stage of described first triode is connected with the first end of described 4th resistance, 9th pin of described phase-locked integrated chip is connected with the first end of described second electric capacity, second end of described second electric capacity simultaneously with the first pin of described phase-locked integrated chip, the negative electricity source of described amplifier is connected with the negative pole of described DC power supply, 7th pin of described phase-locked integrated chip is connected with the second end of described first electric capacity and the in-phase input end of described amplifier simultaneously, 6th pin of described phase-locked integrated chip is connected with the inverting input of described amplifier, the output of described amplifier is the first signal output part of described modem circuit, 4th pin of described voltage controlled oscillator is the secondary signal output of described modem circuit, 7th pin of described voltage controlled oscillator is connected with the first end of described 3rd electric capacity, second end of described 3rd electric capacity is connected with the 6th pin of described voltage controlled oscillator, the octal of described voltage controlled oscillator simultaneously with the 5th pin of described voltage controlled oscillator, the first end of described tenth resistance is connected with the emitter of described 5th triode and ground connection, 11 pin of described voltage controlled oscillator is connected with the second end of described tenth resistance and the first end of described 9th resistance simultaneously, second end of described 9th resistance is connected with the collector electrode of described 5th triode, the base stage of described 5th triode is connected with the second end of described 4th resistance, 9th pin of described voltage controlled oscillator is connected with the first end of described 8th resistance and the collector electrode of described 4th triode simultaneously, second end of described 8th resistance is connected with the sliding end of described first potentiometer, the emitter of described 4th triode is connected with the first end of described second potentiometer, second end of described second potentiometer simultaneously with the sliding end of described second potentiometer, the emitter of described 3rd triode, the positive pole of described diode is connected with the first end of described 6th resistance and ground connection, the collector electrode of described 3rd triode is connected with the second end of described 7th resistance and the base stage of described 4th triode simultaneously, the base stage of described 3rd triode simultaneously with the negative pole of described diode, second end of described 6th resistance is connected with the first end of described 5th resistance, second end of described 5th resistance is the secondary signal input of described modem circuit.
2. a kind of modem circuit for remote management of CPE system according to claim 1, it is characterized in that: the model that described phase-locked integrated chip is selected is LM565, the model that described voltage controlled oscillator is selected is MQE920.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410719734.5A CN104469043A (en) | 2014-12-01 | 2014-12-01 | Modem circuit for remote terminal management system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410719734.5A CN104469043A (en) | 2014-12-01 | 2014-12-01 | Modem circuit for remote terminal management system |
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| Publication Number | Publication Date |
|---|---|
| CN104469043A true CN104469043A (en) | 2015-03-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410719734.5A Pending CN104469043A (en) | 2014-12-01 | 2014-12-01 | Modem circuit for remote terminal management system |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1387348A (en) * | 2001-05-23 | 2002-12-25 | 麦克斯科技公司 | RF modem with phase-locked loop circuit and by frequency shift keying technique |
| CN1770776A (en) * | 2004-09-17 | 2006-05-10 | 株式会社理光 | Transfer device, distributed processing system, transfer device control method, program, and recording medium |
| US20140162568A1 (en) * | 2012-12-07 | 2014-06-12 | Anayas360.Com, Llc | On-chip calibration and built-in-self-test for soc millimeter-wave integrated digital radio and modem |
-
2014
- 2014-12-01 CN CN201410719734.5A patent/CN104469043A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1387348A (en) * | 2001-05-23 | 2002-12-25 | 麦克斯科技公司 | RF modem with phase-locked loop circuit and by frequency shift keying technique |
| CN1770776A (en) * | 2004-09-17 | 2006-05-10 | 株式会社理光 | Transfer device, distributed processing system, transfer device control method, program, and recording medium |
| US20140162568A1 (en) * | 2012-12-07 | 2014-06-12 | Anayas360.Com, Llc | On-chip calibration and built-in-self-test for soc millimeter-wave integrated digital radio and modem |
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Application publication date: 20150325 |
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