CN207603630U

CN207603630U - A kind of FAX communication devices

Info

Publication number: CN207603630U
Application number: CN201721242492.0U
Authority: CN
Inventors: 范玉进; 陈晨; 杨松楠
Original assignee: Tianjin Optical Electrical Communication Technology Co Ltd
Current assignee: Tianjin Optical Electrical Communication Technology Co Ltd
Priority date: 2017-09-26
Filing date: 2017-09-26
Publication date: 2018-07-10
Anticipated expiration: 2027-09-26

Abstract

The utility model provides a kind of FAX communication devices, including first filter, the first amplifier, second filter, the second amplifier, third amplifier and antenna, the first filter is connected with the first amplifier, second filter, the second amplifier, third amplifier with antenna successively signal, local vibration source is equipped between the first amplifier and second filter, the local vibration source is DDS direct synthesizers, for generating local oscillation signal；The utility model selects single-conversion structure, and using DDS as local vibration source, compared with conventional phase locked loops (PLL) mode, configuration simple in structure is easily at low cost.Transmitting module, with PERCOM peripheral communication using serial mode, can simplify communication mode and control logic using independent control simultaneously.

Description

A kind of FAX communication devices

Technical field

The utility model belongs to the communications field, more particularly, to a kind of FAX communication devices.

Background technology

In the communication technology and sensory field of optic fibre, generally require on the signal sent out at signal transmitter end superposition or Suitable modulated signal is loaded to do corresponding modulation treatment to carrier signal, so as to be received in signal receiving end by one Set pattern rule changes and facilitates the electric signal of processing so as to be conducive to solve the various unlike signals received in signal receiving end Reason is mediated to extract useful signal.And traditional signal generating apparatus is usually since its volume is big and its price is prohibitively expensive, The factors such as its function is single in addition and use environment is limited are so as to cause it to be not easy to be widely used to promote, ordinary straight in the prior art Discharge technique or Harmonics amplification transmitting link, using the technology to modulated intermediate frequency signal single-conversion, numerical portion design is complicated. In classical signal occurrence of equipment local vibration source use conventional phase locked loops (PLL) mode, structure it is more complicated and meanwhile configuration also it is more difficult into This is higher.

Utility model content

In view of this, the utility model is directed to a kind of a kind of FAX communication devices for 2MHz~30MHz.

In order to achieve the above objectives, the technical solution of the utility model is realized in：

A kind of FAX communication devices, including first filter, the first amplifier, second filter, the second amplifier, third Amplifier and antenna, the first filter and the first amplifier, second filter, the second amplifier, third amplifier and Signal connects antenna successively, and local vibration source is equipped between the first amplifier and second filter, and the local vibration source is direct for DDS Frequency synthesizer, for generating local oscillation signal.

Further, the first filter is 45M07B narrow-band crystal filters；The second filter uses Passive fourth order low-pass wave filter.

Further, first amplifier, the second amplifier are that Hittite HMC580 single-chip integration microwaves are put Big device；Third amplifier is low-power amplifier, using AFT05MS003N chips.

Further, the DDS direct synthesizers are also connect with microcontroller serial port, and the microcontroller is C8051 microcontrollers.

Further, the input signal of the device is 45MHz intermediate-freuqncy signals.

Further, which uses the isolated pcb board of digital-to-analogue.

Further, which is additionally provided with power supply, and the power supply is used for as transmitting link and DDS direct synthesizers Power supply.

Relative to the prior art, a kind of FAX communication devices described in the utility model have the advantage that：

(1) the utility model selects single-conversion structure, and using DDS as local vibration source, with conventional phase locked loops (PLL) side Formula is compared, and configuration simple in structure is easily at low cost.Simultaneously using independent control, with PERCOM peripheral communication using serial mode, Neng Goujian Change communication mode and control logic.

(2) the utility model can be reduced system design and be adjusted using local frequency source of secondary of the monolithic DDS as transmitting link Examination and PCB surface product.Simultaneously PCB design using digital-to-analog circuit isolation by the way of, reduce digital and analogue signals between interfering with each other with Spurious emissions.

Description of the drawings

The attached drawing for forming the part of the utility model is used to provide a further understanding of the present invention, this practicality is new The illustrative embodiments and their description of type do not form the improper restriction to the utility model for explaining the utility model. In attached drawing：

Fig. 1 is the structure diagram described in the utility model embodiment；

Fig. 2 is the DDS circuit figure described in the utility model embodiment；

Fig. 3 is the single chip circuit figure described in the utility model embodiment.

Specific embodiment

It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the utility model can To be combined with each other.

Term " first ", " second " etc. are only used for description purpose in the description of the present invention, and it is not intended that referring to Show or imply relative importance or imply the quantity of the technical characteristic indicated by indicating." first ", " second " are defined as a result, Deng feature can express or implicitly include one or more this feature.In the description of the present invention, unless It is otherwise noted, " multiple " are meant that two or more.

In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " is pacified Dress ", " connected ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or integrally Connection；Can be mechanical connection or electrical connection；It can be directly connected, can also be indirectly connected by intermediary, It can be the connection inside two elements.For the ordinary skill in the art, on being understood by concrete condition State concrete meaning of the term in the utility model.

The utility model will be described in detail below with reference to the accompanying drawings and embodiments.

As shown in Figure 1, a kind of FAX communication devices, put including first filter, the first amplifier, second filter, second Big device, third amplifier and antenna, the first filter and the first amplifier, second filter, the second amplifier, third Amplifier is connected with antenna successively signal, local vibration source is equipped between the first amplifier and second filter, as shown in Fig. 2, institute The local vibration source stated is DDS direct synthesizers, and chip uses AD9958 chips LO1, and for the local oscillation signal exported, LO2 can be to be Other modules of system provide the clock signal of high-precision low spurious.

The first filter of this module is 45M07B narrow-band crystal filters；The second filter uses passive quadravalence Low-pass filter；First amplifier, the second amplifier are Hittite HMC580 single-chip integration microwave amplifiers；The Three amplifiers are low-power amplifier, using AFT05MS003N chips.It is also connected on the DDS direct synthesizers of this module There is microcontroller, the microcontroller is C8051 microcontrollers.This module enters signal for 45MHz intermediate-freuqncy signals.This module uses The isolated pcb board of digital-to-analogue.

In addition, as shown in figure 3, the digital control processing routine of the utility model relies on microcontroller, wherein U13 is micro-control Coremaking piece C8051F001；J6 (JTAG_10PIN) interface is microcontroller debugging and program download interface；J2 (PORT) is DDS's External debugging interface；Microcontroller workflow predominantly initializes and data reception/transmission：Wherein initialization step is followed successively by just Beginningization parameter setting, clock initialization, configuration register, serial communication setting, DDS setting initial configurations；Data receiver and Forwarding step includes：(1) serial ports write-in control word is read；(2) SPI of frequency digital data write-in DDS is converted out by control word Port.

The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this Within the spirit and principle of utility model, any modification, equivalent replacement, improvement and so on should be included in the utility model Protection domain within.

Claims

1. a kind of FAX communication devices, it is characterised in that：It is put including first filter, the first amplifier, second filter, second Big device, third amplifier and antenna, the first filter and the first amplifier, second filter, the second amplifier, third Amplifier is connected with antenna successively signal, and local vibration source, the local vibration source are equipped between the first amplifier and second filter For DDS direct synthesizers, for generating local oscillation signal.

2. a kind of FAX communication devices according to claim 1, it is characterised in that：The first filter is 45M07B Narrow-band crystal filter；The second filter uses passive fourth order low-pass wave filter.

3. a kind of FAX communication devices according to claim 1, it is characterised in that：First amplifier, the second amplification Device is Hittite HMC580 single-chip integration microwave amplifiers；Third amplifier is low-power amplifier, is used AFT05MS003N chips.

4. a kind of FAX communication devices according to claim 1, it is characterised in that：The DDS direct synthesizers are also It is connect with microcontroller serial port, the microcontroller is C8051 microcontrollers.

5. a kind of FAX communication devices according to claim 1, it is characterised in that：The device circuit board is isolated using digital-to-analogue Formula pcb board.

6. a kind of FAX communication devices according to claim 1, it is characterised in that：The input signal of the device is in 45MHz Frequency signal.

7. a kind of FAX communication devices according to claim 1, it is characterised in that：The device is additionally provided with power supply, the electricity Source is used for as transmitting link and the power supply of DDS direct synthesizers.