CN201130943Y - Simple apparatus for implementing wide band signal source - Google Patents

Abstract

The utility model relates to a simple device realizing wide frequency signal source, comprising a micro-control unit MCU, two pieces of frequency combiner chips TSA 5059, a circular loop filtering, a voltage controlled oscillator chip TDA 8060, a voltage controlled oscillator TDA 5737, a boost chip MAX 5028, a keyboard input, a liquid crystal display, a high precision crystal oscillator, a voltage controlled attenuator AV 104-12, a radio-frequency signal amplification, a radio-frequency signal detect and a numerical control decaying and voltage-stabilizing power supply circuit, which is characterized in that two circuits of PLL frequency combiners comprises two groups of the frequency combiner, the circular loop filtering and the voltage controlled oscillator; the MCU is connected with the data of the TSA 5059 by the SDA and the SCL; the frequency signal is covered to 100 MHz to 2200 MHz by the two circuits of PLL frequency combiners; and the complete signal covering is achieved; the signal produced by the voltage controlled oscillator is amplified by a two-stage broadband amplifier.

Description

A kind of easy device that realizes the broadband signal source

Technical field

The utility model belongs to the microcomputer and the communications field, particularly a kind of device of simple and easy broadband signal source of using in the engineering practice of repeater.

Background technology

Existing signal source usually adopts the common frequency synthesizer and the operation principle of voltage controlled oscillator to realize, frequency synthesizer provides required signal to late-class circuit behind the response single-chip microcomputer, thereby produces corresponding signal output.Because common frequencies synthesizer and voltage controlled oscillator are subjected to the restriction of frequency range, bandwidth has only tens megahertzes, to the hundreds of megahertz.Though can adopt professional signal source in engineering practice, because the volume ratio of professional signal source own is bigger, weight is heavier, costs an arm and a leg to popularize use, particularly should not promote in engineering practice.The simple signal volume source that the utility model provides is little hand-holdable, in light weight, and frequency coverage is wide, is particularly suitable in the repeater equipment engineering maintenance precision and the not high occasion of functional requirement being used.

Summary of the invention

The purpose of this utility model is exactly to be difficult for universal defective in order to overcome the inconvenience of carrying professional signal source in engineering practice and to cost an arm and a leg, a kind of easy device that realizes the broadband signal source is provided, it is little that this device has a volume, in light weight being easy to carry, with low cost, frequency coverage is wide, can satisfy advantages such as common communication standard frequency range.

The technical solution of the utility model is:

A kind of easy device that realizes the broadband signal source, mainly by microcontroller MCU, two of synthesizer chip TSA5059, loop filtering, voltage controlled oscillator chip TDA8060, voltage controlled oscillator chip TDA5737, chip MAX5028 boosts, the keyboard input, liquid crystal display, the high-precision crystal oscillator, voltage-controlled attenuator AV104-12, radiofrequency signal is amplified, radio-frequency signal detection, the numerical control decay, voltage-stabilized power supply circuit is formed, the connection signal of each several part is serial data line SDA, serial time clock line SCL, radiofrequency signal RF, radio-frequency (RF) signal switch control signal RFOn, radiofrequency signal output RF_OUT, voltage-controlled deamplification ATT, power detection signal DET, numerical control attenuation data signal Q0～Q9, read signal LCDRS, write signal LCDRW, enable signal EN, data-signal D0～D3, LCDD0～LCDD3, it is characterized in that: (1) is by two class frequency synthesizers, loop filtering, voltage controlled oscillator constitutes two-way PLL frequency synthesizer, and MCU links to each other with SCL by SDA with the data of TSA5059; (2) MAX5028 provides biasing to TDA8060; (3) TDA8060 links to each other by RF with AV104-12, and MCU links to each other with AV104-12 by ATT; (4) MCU links to each other with radio-frequency signal detection by DET; (5) MCU links to each other with numerical-control attenuator control pin respectively by Q0～Q9, obtains the respective attenuation value by Q0～Q9 position is provided with, and can obtain final signal RF_OUT; (6) MCU by to RFOn logic control whether select the opening signal switch, thereby control signal has a no-output; (7) MCU links to each other with liquid crystal with keyboard by LCDRS, LCDRW, EN, D0～D3, LCDD0～LCDD3, as the signal input and output.

Adopt the easy device in above-mentioned realization broadband signal source, carry out according to the following steps:

(1) frequency and amplitude are given MCU by a keyboard entry, and MCU preserves data;

(2) MCU carries out the transmission of data to the TSA5059 synthesizer chip by SDA and SCL, data are by 17bit N0～N16 program divider of TSA5059, the pre-minute mark device of 1-bit PE control bit, the parametric frequency divider frequency dividing ratio control bit of 4-bit R0～R3,4-bit P0～P3 output state, 2-bit charge pump current select position etc. to handle accordingly;

(3) the high-precision crystal oscillator of TSA5059 outside be connected on TSA5059 the XTAL pin as the reference frequency, simultaneously the frequency behind the XT/COMP pin output frequency division of TSA5059 gives down a slice frequency synthesizer as the reference frequency;

(4) TSA5059 output arrives voltage controlled oscillator behind the loop filtering circuit, produces correspondent frequency output;

(5) frequency that produces of voltage controlled oscillator is through " synthetic-voltage-controlled decay-radio frequency amplifications-power detection-numerical control decay-radio-frequency (RF) switch-signal, amplitude output " and " synthesize-voltage-controlled decay-radio frequency amplification-3dB electric bridge-power detection-MCU-〉voltage-controlled decay-radio frequency amplification-3dB electric bridge-numerical control decay-radio-frequency (RF) switch-signal, amplitude export ".

Main feature of the present utility model is to adopt the frequency synthesizer and the voltage controlled oscillator chip of the design of digital satellite receiver tuning system, forms two-way PLL frequency synthesizer and makes its operating frequency cover 100MHz to 2200MHz, amplitude is-and 10dBm～-60dBm.The utility model advantage is that volume is little, and signal covers wide, uses simple.Only need the needs of user according to oneself, by keyboard input correspondent frequency value and range value, just can see correspondent frequency and performance number intuitively by frequency spectrograph, in engineering, use extremely convenient and practically, avoided the phenomenon in a plurality of simple signal sources, arrowband that other use separately of signal demand band of different frequency range.

Description of drawings

Fig. 1 is the electric theory diagram of the utility model embodiment.

Fig. 2 is the hardware structure diagram of Fig. 1 embodiment.

Fig. 3 realizes the flow chart of broadband signal for the utility model.

Embodiment

Embodiment of the present utility model as shown in Figure 1 and Figure 2.Complete machine adopts the handhold portable design, realize the easy device in broadband signal source: mainly by microcontroller MCU, two synthesizer chip TSA5059, loop filtering, two of voltage controlled oscillator chips are respectively TDA8060 and TDA5737, chip MAX5028 boosts, the keyboard input, liquid crystal display, the high-precision crystal oscillator, voltage-controlled attenuator chip AV104-12, radiofrequency signal is amplified, radio-frequency signal detection, the numerical control decay, stabilized voltage power supply and external power source charging circuit are formed, and wherein the data of frequency synthesis chip connection signal is connected by two holding wires of SDA and SCL.The characteristic portion of whole design is made up of two groups of PLL frequency synthesizer circuits, one group of PLL frequency synthesizer has only drawn in Fig. 1 block diagram, change the VCO chip in another group PLL frequency synthesizer and be that TDA5737 sees hardware structure diagram for details is shown in Figure 2, its peripheral circuit changes slightly, and other circuit is the same with TDA8060.Introduce the operation principle of the utility model easy device below in detail:

(1) power supply is supplied with and is adopted the 7.2V rechargeable Ni-H 2 battery, joins charger outward.Offering devices at different levels by the LM2567 voltage stabilizing in the machine uses.The DC/DC booster circuit uses U.S. letter MAX5025 that 5V is promoted to 30V, uses for the pressure regulation transfiguration of variable capacitance diode;

(2) the MCU microcontroller is given TSA5059 frequency synthesis chip transfer of data by SDA and SCL, TSA5059 carries out data processing in strict accordance with Data Transport Protocol, then by accurate voltage of adjusting of the 16th pin output, the external transistor base of TSA5059 chip 16 pin, transistor collector is connected on the 30V divider resistance, the voltage of 16 pin output makes the triode two ends produce pressure drop, turn-on transistor, thereby change the reverse voltage of input loop filtering variable capacitance diode, when adding 0V～30V voltage at the variable capacitance diode negative pole, capacitance will change in certain scope, and the change of external capacitor value directly influences the output frequency of TDA8060;

(3) circuit theory of HFS employing is made up of VCO chip TDA8060 and two variable capacitance diodes.The output frequency scope of design of voltage controlled oscillator TDA8060 is 900MHZ～2200MHZ.Voltage controlled oscillator output signal is divided into two-way, and one the tunnel exports to mixer; Another road send the frequency synthesis chip for feedback division relatively, the frequency synthesis chip can receive predetermined frequency information by SDA and SCL holding wire and converse frequency division parameter, radiofrequency signal is carried out bit comparison mutually by frequency division and with the frequency division of benchmark crystal oscillator after entering the frequency synthesis chip, if do not meet the requirement of presetting in 900MHZ～2200MHZ scope, the frequency synthesis chip will be given two variable capacitance diodes by accurate voltage of adjusting of 16 pin output, meet up to the frequency that detects and preset requirement;

(4) circuit theory and the 900MHZ～2200MHZ frequency generating circuit of low side frequency part are basic identical.Different is that the TDA5737 peripheral circuit is made up of 3 lc circuits, can cover the frequency range of 100MHZ～900MHZ, different frequency ranges is carried out waveband selection by MCU, its waveband selection is by A band, respective frequencies scope 80MHZ～210MHZ, B band, respective frequencies scope 210MHZ～490MHZ and C band, respective frequencies scope 490MHZ～900MHZ forms, and control mode is with in (3);

(5) in conjunction with top (3) and (4), what frequency signal was complete covers to 100MHZ～2200MHZ;

(6) through the frequency of TDA8060 or TDA5737 output after mixer is synthetic with signal, export voltage-controlled attenuator to, signal is carried out intensity decays, through the signal strength signal intensity of TDA8060 or TDA5737 output-26dBm～-6dBm between about, can reach-50dBm by the signal minimum after the voltage-controlled attenuator decay;

(7) the radiofrequency signal RF through voltage-controlled attenuator output amplifies the signal that voltage controlled oscillator produces by the two-stage wide-band amplifier; Broadband amplifiers enters the 3dB electric bridge again, again signal is decayed, and behind the 3dB electric bridge, the gain of calculating whole link with weak signal can reach 2dBm, has designed test point simultaneously behind the 3dB electric bridge, sees the output of frequency intuitively by frequency spectrograph;

(8) signal is sent into the radio-frequency power detection chip behind the 3dB electric bridge, magnitude of voltage after the radio-frequency power detection chip detects DET returns MCU, MCU detects the gained magnitude of voltage according to radio-frequency power and judges that the range value of signal is again by the detection to the ATT voltage-controlled attenuator, if the amplitude information by the reflection of 3dB bridge voltage is not 2dBm, then MCU finely tunes through voltage-controlled attenuator by the ATT output voltage, is 2dBm up to amplitude.Because amplifier can cause the different and then influence output detection voltage of output amplitude to the response difference of different frequency, has added side-play amount control output in voltage-controlled attenuator control.

Referring to Fig. 3.The flow process of the utility model realization broadband signal as shown in Figure 3.

(1) the complete machine keyboard is set to 16 buttons, wherein numerical key 0,1,2,3,4,5,6,7,8,9, frequency FreqIn and the MHz of unit are set, amplitude A mplitude value and the dBm of unit are set, radio-frequency (RF) switch button Switch, but the amplitude calibration value setup menu page accesses Input Offset Value or according to the form below negative sign Menu once more under the current frequency, and amplitude increases "+", and amplitude reduces "-";

(2) keyboard incoming frequency value, MCU preserves data, by the liquid crystal display frequency values, after MCU obtains incoming frequency, carry out corresponding data processing after, the determination frequency scope belongs to that PLL frequency synthesizer passage, select corresponding PLL frequency synthesizer then, obtain mutually deserved frequency output.Getting PLL 1 passage among the figure is by frequency synthesis chip TSA5059, loop filtering, and voltage controlled oscillator TDA5737 forms; PLL 2 is by frequency synthesis chip TSA5059, loop filtering, and voltage controlled oscillator TDA8060 forms;

(3) keyboard input range value, MCU preserves data, size by the liquid crystal display range value, detect the input value of signal amplitude as MCU, MCU according to the 3dB electric bridge after the level power output detect to use a calibration information that dispatches from the factory to come the FEEDBACK CONTROL voltage-controlled attenuator, the level power output is stablized in the scope of control setting after finally making the 3dB electric bridge, and amplitude information is given two-stage numerical-control attenuator processing back and exported the amplitude that is provided with;

(4) also can remember in MCU as fine setting in the amplitude calibration information of different frequency range the two-stage numerical-control attenuator.Generally need calibration power output when the 100MHZ frequency range.Like this, secondary calibration power is guaranteed the signal amplitude output accuracy of complete machine;

(5) the continuous keyboard scan input of MCU, each operation of response shows PLL ERR when frequency anomaly, show Amp ERR when amplitude is unusual;

(6) in the block diagram VAP to represent DET to detect the gained voltage transition be corresponding amplitude, amplitude by judging input and the relation of VAP are carried out feedback adjusting;

(7) MCU links to each other with the output of power detection chip by DET, mainly be for the power detection of detection power detection chip behind the 3dB electric bridge converts magnitude of voltage to, come the magnitude of voltage realization closed loop feedback that signal ATT adjusts voltage-controlled attenuator that is connected with AV104-12 according to the size of magnitude of voltage then by MCU.

Claims (1)

1, a kind of easy device that realizes the broadband signal source, mainly by microcontroller MCU, two of synthesizer chip TSA5059, loop filtering, voltage controlled oscillator chip TDA8060, voltage controlled oscillator chip TDA5737, chip MAX5028 boosts, the high-precision crystal oscillator, voltage-controlled decay AV104-12, radiofrequency signal is amplified, radio-frequency signal detection, the numerical control decay, voltage-stabilized power supply circuit is formed, the connection signal of each several part is serial data line SDA, serial time clock line SCL, radiofrequency signal RF, radio-frequency (RF) signal switch control signal RFOn, radiofrequency signal output RF_OUT, voltage-controlled deamplification ATT, power detection signal DET, numerical control attenuation data signal Q0～Q9, read signal LCDRS, write signal LCDRW, enable signal EN, data-signal D0～D3, LCDD0～LCDD3 is characterized in that:

1., constitute two-way PLL frequency synthesizer, MCU links to each other with SCL by SDA with the data of TSA5059 by two class frequency synthesizers, loop filtering, voltage controlled oscillator;

2., MAX5028 provides biasing to TDA8060;

3., TDA8060 links to each other by RF with AV104-12, MCU links to each other with AV104-12 by ATT; 4., MCU links to each other with the power detection signal by DET;

5., MCU links to each other with numerical-control attenuator control pin respectively by Q0～Q9, by Q0～Q9 position setting is obtained the respective attenuation value, can obtain final signal RF_OUT;

6., MCU by to RFOn logic control whether select the opening signal switch, thereby control signal has a no-output;

7., MCU links to each other with liquid crystal with keyboard by LCDRS, LCDRW, EN, D0～D3, LCDD0～LCDD3, as the signal input and output.

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