CN104734730A - Communication transmitter and communication receiver - Google Patents
Communication transmitter and communication receiver Download PDFInfo
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- CN104734730A CN104734730A CN201510135708.2A CN201510135708A CN104734730A CN 104734730 A CN104734730 A CN 104734730A CN 201510135708 A CN201510135708 A CN 201510135708A CN 104734730 A CN104734730 A CN 104734730A
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Abstract
The invention relates to a communication transmitter and a communication receiver. The communication transmitter comprises a modulator circuit and a frequency synthesis circuit connected with the modulator circuit, and the modulator circuit adopts digital signal processors (DSP). The invention provides the communication transmitter and the communication receiver which are high in processing speed and high in precision.
Description
Technical field
The application belongs to the communications field, relates to a kind of communication equipment, particularly relates to a kind of communication transmitter and communication control processor.
Background technology
Transmitter is a part crucial in communication system, and had transmitter, information just can be processed to be the signal of applicable transmission, and then by transmission, information is transmitted.The current modulation circuit for transmitter is primarily of chip microcontroller, and its processing speed is slow, and precision is limited; The modulation system that current transmitter adopts is analog form, does not accomplish accurate control to modulation degree and power.In addition, also abundant not to effective control of electromagnetic interference in current transmitter.
Equally, receiver is the important component part of communication system, works in the destination end of communication link, and its function is for Received signal strength and is processed or change for local.Demodulator circuit at present for receiver adopts chip microcontroller, and its processing speed is slow, and precision is limited, thus makes the sensitvity constraint of receiver; Meanwhile, current receiver is also abundant not to effective control of electromagnetic interference.
Summary of the invention
In order to solve the above-mentioned technical problem existed in background technology, this application provides a kind of processing speed is fast and precision is high communication transmitter and communication control processor.
The technical solution of the application is: this application provides a kind of communication transmitter, the frequency synthesizer circuit comprising modulation circuit and be connected with modulation circuit; Its special character is: described modulation circuit adopts digital signal processor DSP.
Above-mentioned modulation circuit adopts the digital signal processor DSP with floating-point operation.
Above-mentioned modulation circuit adopts the digital signal processor DSP with floating-point operation with AD function.
Above-mentioned modulation circuit is taken to the digital signal processor DSP with floating-point operation that rare 8 tunnels have AD function.
Said frequencies combiner circuit comprises control chip, voltage to frequency convert unit, coupling and filter circuit and frequency output terminal; Described control chip is by voltage to frequency convert unit access coupling and filter circuit; Described coupling and filter circuit access frequency output terminal and control chip respectively; Described voltage to frequency convert unit is low-noise voltage-controlled oscillator VCO; Described control chip access modulation circuit.
A kind of communication control processor, comprises tuning amplification circuit, mixting circuit, controlled amplifying circuit and main control circuit; Described tuning amplification circuit is by mixting circuit and controlled amplifying circuit access main control circuit; Its special character is: described main control circuit comprises digital signal processor DSP; Described digital signal processor DSP is connected with controlled amplifying circuit and tuning amplification circuit respectively.
Above-mentioned main control circuit also comprises the programmable logic controller (PLC) FPGA be connected with digital signal processor DSP.
Above-mentioned digital signal processor DSP is the digital signal processor DSP with fixed-point calculation.
Above-mentioned digital signal processor DSP is the digital signal processor DSP with floating-point operation with DA function.
Above-mentioned digital signal processor DSP is the digital signal processor DSP with floating-point operation having at least 8 tunnels to have DA function.
The advantage of the application is:
1, transmitter adopts floating point processor to carry out calculating and controlling, and computational accuracy is high, and it is more accurate to control; This processor, with analog-digital conversion function, can carry out Real-Time Monitoring to circuit signal, accomplishes signals collecting, analysis, control integration;
2, receiver adopts fixed-point processor to be used for analyzing to received signal, and speed is fast, and real-time is high, can control tuning circuit in time, optimizes the quality of Received signal strength;
3, receiver adopts FPGA to realize clock chain, can make the public clock source of receiver unit on the one hand, cost-saving; On the other hand, be conducive to receiver unit and realize the synchronous of clock.Meanwhile, the peripheral pin of FPGA is many, adds the scalability of receiver;
4, transmitter and receiver adopts identical frequency synthesis unit, wide frequency range, and independence is high, is conducive to the autgmentability of product.
Accompanying drawing explanation
Fig. 1 is the principle framework structural representation of the communication transmitter that the application provides;
Fig. 2 is the principle framework structural representation of the frequency synthesizer circuit that the application adopts in communication transmitter;
Fig. 3 is the principle framework structural representation of the communication control processor that the application provides.
Embodiment
See Fig. 1, this application provides a kind of transmitter, form primarily of audio signal processing circuit, modulation circuit, power amplifier, observation circuit and frequency synthesizer circuit.Audio signal first by digital processing, is reached the requirement of modulation circuit, is then amplified by power amplification circuit, finally deliver to antenna transmission and go out after sending into.In the process, also various signal to constantly be monitored whether extremely by observation circuit.
First the modulation circuit that this transmitter adopts has carried out digital processing to audio signal, this process be audio modulation signal is amplified after, enter ALC circuit again control to amplify and compress process after, be admitted to 12-bit D/A conversion chip, audio signal quantizes by 4096 grades by this conversion chip, thus completing numeral change, the change of this numeral is controlled to implement by DSP; Then the output current signal of conversion chip is by giving rear class process as controllable modulation signal after current/voltage converter.Modulation depth and power are all here and are controlled by DSP, and this technology is initiated at present at home.
The digital signal processor DSP that modulation circuit adopts of the application, especially with the digital signal processor DSP of floating-point operation, preferably has the digital signal processor DSP with floating-point operation of AD function; It is most preferably the digital signal processor DSP with floating-point operation having at least 8 tunnels to have AD function; The such as digital signal processor DSP of TI2000 series or the DSP of other type all can be used for the application.
Wherein, in modulation circuit, need a high-frequency signal as carrier wave, and frequency of carrier signal stability is very high, therefore needs one can produce the high frequency synthesizer circuit of frequency stability.See Fig. 2, the frequency synthesizer circuit that the application adopts is made up of a low-noise voltage-controlled oscillator VCO, and VCO is regulated by a phase-locked loop PLL.Reference frequency is obtained by the crystal oscillator of a 10MHz, and it results from the oscillator of band temperature-compensating.
Frequency synthesizer circuit comprises control chip, voltage to frequency convert unit, coupling and filter circuit and frequency output terminal; Control chip is by voltage to frequency convert unit access coupling and filter circuit, and matched filtering circuit major function realizes power match and filtering second harmonic; Coupling and filter circuit access frequency output terminal and control chip respectively, and control chip can adopt the low side CPU of such as single-chip microcomputer to realize, and here in order to saving resource, the function of this control chip is realized by the DSP of transmitter; Voltage to frequency convert unit is low-noise voltage-controlled oscillator VCO; Control chip access modulation circuit.
Phase-locked loop receives the frequency fed back, the pulse changed by phase detector, and after correct adjustment, loop filter exports a fixing direct current DC voltage, makes VCO export a fixing frequency.Frequency synthesizer is manipulated by control unit.
Mutually interference-free between signal in order to ensure in receiver or transmitter, this transmitter has taken into full account complicated electromagnetic environment interference, have employed a large amount of EMC Design technology, reduce the interference of electromagnetic environment to greatest extent, ensure stability and the reliability of transmitter.First, this transmitter takes isolation processing to power supply, the power supply of analog circuit, digital circuit, small-signal power supply and large-signal is provided separately, simultaneously, signalling channel amplifying circuit at different levels is powered and is adopted parallel way to power, each level power supply is mutually isolated, reduces interference mutually to greatest extent.The second, this transmitter, to small signal process circuit and large signal circuit diveded shield, reduces large-signal to the interference of small-signal.3rd, digital and analog circuit separates by this transmitter, eventually through the mode of one point earth, reduces the crosstalk of ground wire.4th, this transmitter have employed a large amount of low-pass filtering measures to control line, Power supply at different levels.
See Fig. 3, the application is while providing technique scheme, additionally provide a kind of communication control processor that is that match with communication transmitter or that be used alone, this communication control processor comprises antenna, tuning circuit, mixting circuit, controlled amplifying circuit, DSP process and control circuit, voicefrequency circuit.
Tuning amplification circuit is by mixting circuit and controlled amplifying circuit access main control circuit; Main control circuit comprises digital signal processor DSP; Digital signal processor DSP is connected with controlled amplifying circuit and tuning amplification circuit respectively.
Meanwhile, main control circuit also comprises the programmable logic controller (PLC) FPGA be connected with digital signal processor DSP.
Digital signal processor DSP is the digital signal processor DSP with fixed-point calculation; Preferably there is the digital signal processor DSP with fixed-point calculation of DA function; Be more preferably the digital signal processor DSP with fixed-point calculation having at least 8 tunnels to have DA function.
Receiver carries out tuning, Frequency mixing processing to the radiofrequency signal received, and obtains an intermediate-freuqncy signal; This intermediate-freuqncy signal is amplified by the controlled amplifying circuit of voltage, export to DSP process and control circuit, DSP process and control circuit are analyzed to the received signal, three road signals are had to export: the first via is tuning voltage signal, carry out tuning control for radio frequency signal, improve tuning circuit selecting frequency characteristic; Second tunnel is that intermediate frequency controls amplifying signal, controls, control the gain of amplifying circuit for carrying out amplification to intermediate-freuqncy signal; 3rd tunnel is the two-way intermediate-freuqncy signal that amplitude is different, gives voicefrequency circuit, after again processing and changing, give external equipment.Tuning amplification circuit is divided into three grades, and its Main Function is the frequency regulating received RF signal.Tuning amplification circuit regulates receive frequency to be realized by variable capacitance diode, and when being added in the bias voltage change of variable capacitance diode, the capacitance of variable capacitance diode also changes thereupon, thus completes and carry out tuning frequency-selecting to useful radiofrequency signal.
The radiofrequency signal that antenna receives is input to band pass filter by radio frequency interface feeder line, then sends into three grades of frequency-selecting tuning amplification circuits through protective circuit of diode.Radiofrequency signal selected after three grades tuning is amplified through amplifier, gives mixer.
The tuning voltage of three grades of tuning circuits is all produce from DSP process and control circuit.
Antenna receive radiofrequency signal by radio frequency interface through protective circuit of diode input tape bandpass filter.This circuit band pass filter is made up of inductance and electric capacity, and filter frequency range is 118-144MHz.First order tuning amplification circuit by a tunable filter circuit, transistor amplifier, the compositions such as phase shifter.Common base triode amplifies radiofrequency signal, and by phase shifter, deliver to second level tunable filter circuit through coupling capacitance, this circuit is regulated by di-cap, and the radiofrequency signal after adjustment is amplified in signal amplifier, to third level tunable filter circuit.Third level tunable filter circuit is regulated by di-cap, and the radiofrequency signal after adjustment is exaggerated device and amplifies, and the signal after amplification arrives first order intermediate frequency mixer.
Mixting circuit is made up of two-stage mixing, and its Main Function is linearly moving of frequency spectrum, the frequency of the high-frequency signal received with local oscillation signal is added and subtracted mutually, after bandwidth-limited circuit, obtains the intermediate-freuqncy signal of lower fixed frequency.
Radiofrequency signal after amplification and preliminary election enters first order frequency mixer, and the local oscillation signal of frequency mixer is
153.25MHz ~ 179.25MHz, produce circuit by a local oscillation signal of frequency synthesizer and produce, frequency mixer exports the first order intermediate-freuqncy signal for 35.25MHz.One intermediate-freuqncy signal arrives first order intermediate frequency amplifier through filter circuit, then enters band pass filter through attenuator after exporting from frequency mixer, with the unwanted signal beyond filtering 35.237MHZ to 35.263MHZ passband, thus ensure that intermediate-freuqncy signal is pure, and signal edge is precipitous, limited bandwidth.
First order intermediate-freuqncy signal arrives second level intermediate frequency amplifier through coupling capacitance, is amplified to and meets mixing level demand, then enter second level frequency mixer.The local oscillation signal of this frequency mixer is 34.795Mz, produces circuit and produces, after multichannel inverter carries out amplifying and mate, be divided into the TTL signal that two-way phase place is contrary, as the input control signal of frequency mixer by two local oscillation signals.
Radiofrequency signal, after twice mixing, exports two intermediate-freuqncy signals of 455KHz.
The local oscillation signal used in mixting circuit produces circuit and is made up of 34.795MHz crystal oscillator and frequency synthesizer, 34.795MHz crystal oscillator produces the clock signal of 34.795MHz, give second level frequency mixer, frequency synthesizer produces the clock signal of 153.25MHz-179.25MHz, gives first order frequency mixer.
Frequency synthesizer is made up of a low-noise voltage-controlled oscillator VCO, and VCO is regulated by a phase-locked loop PLL.Reference frequency is obtained by the frequency of a 10MHz, and it results from the oscillator of band temperature-compensating.Phase detector not only produces pulse therebetween in frequency adjustment, after adjustment completes, also produce pulse.Pulse is present in ensuing filtering loop always.The voltage resulted from here is delivered to VCO and is used as control voltage.The frequency that VCO exports again loopback, to frequency synthesizer, compares with reference frequency.When frequency exceeds normal value, phase place with preset different time, the pulse that frequency synthesizer can change, its pulsewidth and polarity correspond to the deviation of frequency and the different of phase place.After correct adjustment, loop filter exports a fixing direct current DC voltage, makes VCO export a fixing frequency.VCO frequency enters Huan and rushes Fang great Qi ﹑ Dai pass filter Qi ﹑ coupling capacitance and an attenuator.VCO frequency by band pass filter, attenuator as local oscillation signal, for the local oscillator of first order frequency mixer.
Signal after tuning and mixing is the intermediate-freuqncy signal of 455KHz, enters controlled amplification path through filter, and the intermediate-freuqncy signal after amplification arrives DSP process and control circuit.
Controlled amplifying circuit is made up of the ceramic filter of two controlled intermediate frequency control amplifiers, 455KHz and operational amplifier.
The task of intermediate frequency control amplifier is amplified the intermediate-freuqncy signal that frequency conversion obtains, and the gain amplifier of intermediate frequency control amplifier, by the control of AGC control voltage, therefore can be produced by DSP process and control circuit and export the gain controlling intermediate-freuqncy signal.
Ceramic filter is made up of Lead Zirconate Titanate ceramic material, this ceramic material is made sheet, two sides is coated with silver as electrode, after high direct voltage polarization, just there is piezoelectric effect, play filtering, have stable, the feature that interference free performance is good, replace the LC filter circuit in portions of electronics circuit with it, make its work more stable.
Because DSP requires that the signal amplitude entering digiboard is ± 1VPP, so need to amplify intermediate-freuqncy signal.The operational amplifier that this circuit adopts is that the cascade of low noise high-gain is placed on circuit, and fixed gain is 90dB.
DSP process and control circuit are the control core of whole receiving circuit.The radiofrequency signal received enters DSP process after tuning, mixing, filtering process and control circuit is analyzed, DSP carries out parameter adjustment according to the signal to noise ratio of signal to tuning circuit and controllable amplifier circuit on the one hand, and the restituted signal met the demands is exported to voicefrequency circuit by DSP on the other hand.The noise elimination of receiver, de-noising function, digital filter functions are all realized by the DSP software of this circuit.
The tuning voltage that DSP process and control circuit export and intermediate frequency amplify control voltage and pass through amplifier, EMC filter filtering, tuning voltage works through the negative electrode of RC network to variable capacitance diode, and intermediate frequency amplifies control voltage and controls it to intermediate frequency control amplifier through bleeder circuit.EMC filter filtering will consider the external electromagnetic interference (radiation+conduction) introduced from power line on the one hand; in-house facility also to be avoided outwardly to send noise drying on the other hand; be mainly used to filtering conducted interference; suppression and the extraneous noise signal produced of decay are disturbed and affect the equipment protected, and suppression and relaxation equipment produce interference to external world simultaneously.
Claims (10)
1. a communication transmitter, the frequency synthesizer circuit comprising modulation circuit and be connected with modulation circuit; It is characterized in that: described modulation circuit adopts digital signal processor DSP.
2. according to the communication transmitter described in claim 1, it is characterized in that: described modulation circuit adopts the digital signal processor DSP with floating-point operation.
3. according to the communication transmitter described in claim 2, it is characterized in that: described modulation circuit adopts the digital signal processor DSP with floating-point operation with AD function.
4. according to the communication transmitter described in claim 3, it is characterized in that: described modulation circuit is taken to the digital signal processor DSP with floating-point operation that rare 8 tunnels have AD function.
5. the communication transmitter according to claim 1 or 2 or 3 or 4, is characterized in that: described frequency synthesizer circuit comprises control chip, voltage to frequency convert unit, coupling and filter circuit and frequency output terminal; Described control chip is by voltage to frequency convert unit access coupling and filter circuit; Described coupling and filter circuit access frequency output terminal and control chip respectively; Described voltage to frequency convert unit is low-noise voltage-controlled oscillator VCO; Described control chip access modulation circuit.
6. a communication control processor, comprises tuning amplification circuit, mixting circuit, controlled amplifying circuit and main control circuit; Described tuning amplification circuit is by mixting circuit and controlled amplifying circuit access main control circuit; It is characterized in that: described main control circuit comprises digital signal processor DSP; Described digital signal processor DSP is connected with controlled amplifying circuit and tuning amplification circuit respectively.
7. according to the communication control processor described in claim 6, it is characterized in that: described main control circuit also comprises the programmable logic controller (PLC) FPGA be connected with digital signal processor DSP.
8. the communication control processor according to claim 6 or 7, is characterized in that: described digital signal processor DSP is the digital signal processor DSP with floating-point operation.
9. communication control processor described according to Claim 8, is characterized in that: described digital signal processor DSP is the digital signal processor DSP with floating-point operation with DA function.
10. according to the communication control processor described in claim 9, it is characterized in that: described digital signal processor DSP is the digital signal processor DSP with floating-point operation having at least 8 tunnels to have DA function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510135708.2A CN104734730A (en) | 2015-03-26 | 2015-03-26 | Communication transmitter and communication receiver |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510135708.2A CN104734730A (en) | 2015-03-26 | 2015-03-26 | Communication transmitter and communication receiver |
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| CN104734730A true CN104734730A (en) | 2015-06-24 |
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| CN201510135708.2A Pending CN104734730A (en) | 2015-03-26 | 2015-03-26 | Communication transmitter and communication receiver |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114204949A (en) * | 2021-11-30 | 2022-03-18 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Large dynamic fast digital AGC control method |
-
2015
- 2015-03-26 CN CN201510135708.2A patent/CN104734730A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114204949A (en) * | 2021-11-30 | 2022-03-18 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Large dynamic fast digital AGC control method |
| CN114204949B (en) * | 2021-11-30 | 2024-01-30 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Large dynamic quick digital AGC control method |
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Application publication date: 20150624 |