CN201294514Y - Video digital modulation capable of restraining minor lobe and antenna drive circuit - Google Patents
Video digital modulation capable of restraining minor lobe and antenna drive circuit Download PDFInfo
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- CN201294514Y CN201294514Y CNU200820161709XU CN200820161709U CN201294514Y CN 201294514 Y CN201294514 Y CN 201294514Y CN U200820161709X U CNU200820161709X U CN U200820161709XU CN 200820161709 U CN200820161709 U CN 200820161709U CN 201294514 Y CN201294514 Y CN 201294514Y
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Abstract
The utility model relates to a video digital modulation and antenna driving circuit capable of suppressing side-lobe relating to a quadrature phase shift keying modulator of video frequency signals for the short distance ultra-short wave communication, and a radio frequency amplifying and antenna driving circuit, wherein the circuit adopts the quadrature phase shift keying modulation (QPSK), the automatic frequency control (automatic frequency control, AFC) and the automatic phase control (automatic phase control, APC), and an integral design of driving and amplifying the antenna and the realization proposal, the modulator comprises a quadrature phase shift keying modulator (1) which is formed from a programmable digital QPSK/16-QAM modulator (11) and a control processor (12), a coupling circuit, a 65 MHz filter (2), a 430 MHz up converter (3), a programmable antenna amplifier (4), and an automatic frequency control and automatic phase control mixing circuit (5). The utility model provides the solving proposal for the pitch design of a video frequency monitoring and controlling wireless sensor/actuator with low cost and limited resource, and also provides the solving proposal for the short distance visualization wireless loudspeaker microphone performance/ price ratio with low cost.
Description
Technical field
The utility model relates to a kind of vision signal orthogonal PSK modulator and radio frequency that is used for the short distance ultra short wave communication and amplifies and a day line drive circuit, this circuit has adopted orthogonal PSK modulation (QPSK), automatic frequency control (automaticfrequency control, AFC) and automatic phase control (automatic phase control, APC), and antenna driving amplification integrated design and implementation, belong to the twireless radio-frequency communication technical field.
Background technology
In the world, in recent years, multi-sensor information obtains and has developed a kind of brand-new information obtain manner---and wireless senser/actor network (wireless sensor and actor networks, WSAN).Wireless senser/actor network, it is the wireless network that is made of with the communication mode of self-organizing and multi-hop the transducer/actuator of many static or mobile low costs, resource-constrained, its objective is that perception collaboratively, acquisition process, control and transmission network cover the monitoring information of perceptive object in the geographic area, and give the user report information.Wireless sensers such as the monitoring/actor network node of monitoring in real time and law enforcement supervision, wetland birds behavior observation automatically, traffic monitoring, harbor such as the environmental emissions source time, these nodes need have that video image obtains and transfer function.
(the hand-hold type civil radio intercom application of hyperfrequency UHF300～3000MHZ), low-cost visual wireless tranceiver also has than the big market demand to be operated in the ultrashort wave frequency range.
At present, the low-cost monitoring wireless senser/actor network of above-mentioned field work environment, and the civilian low-cost wireless electricity of hand-hold type intercom, the video image that they generally do not have low-cost characteristic obtains and transfer function.
Have video capability and the monitoring sensor of video monitor cheaply/actor network node apparatus that have higher P/C ratio in order to design, and design visible wireless electricity intercom, except that video image obtains and the circuit design of transmission aspect needs the special consideration, the inhibition of visual modulator radio noise and independently antenna drive the amplifying circuit module, can directly influence video monitor monitoring sensor/actor network node apparatus, and the P/C ratio of visible wireless electricity intercom.
Being operated in frequency range at present is video monitor monitoring wireless senser/actor network node of 400～470MHZ (megahertz), with low-cost visible wireless electricity intercom, exist video image resolution low, the transmission image that receives is of low quality, there is serious " hangover " phenomenon, and radio frequency output serious interference.Its main cause mainly contains: the one,, emission spectrum purity is not high, and first secondary lobe of modulator radio frequency output can not be suppressed effectively, causes harmonic wave and noise jamming serious.The 2nd,, it is independent design separately that modulator, upconverter and antenna drive the amplifying circuit module, do not have degenerative automatic frequency control (automatic frequency control between them, AFC) and automatic phase control (automatic phase control, APC), cause the accuracy of tranmitting frequency and stability not high.
Summary of the invention
Technical problem: the purpose of this utility model is digital video modulation and day line drive circuit that proposes a kind of suppressed sidelobes, adopt programmable digital QPSK/16-QAM modulator chip, coupling and 65MHz filter circuit, 430 megahertz upconverter, automatic frequency control (AFC) and automatic phase control (APC) mixed circuit, devices such as able to programme and antenna driving amplifier, low-cost monitoring transducer/actor network node apparatus for the field work environment, reach the civilian low-cost visible wireless electricity intercom of hand-hold type and design, be used for the vision signal orthogonal PSK modulator of short distance 430 megahertz frequency ultra short wave communications and the ultrashort wave antenna of the direct 400～470MHZ of driving wave band.
Technical scheme: the utility model has adopted digital quadrature phase-shift keying modulation (QPSK) technology, having designed a kind of novel vision signal orthogonal PSK modulator and radio frequency amplifies and a day line drive circuit, the radio frequency operation frequency of this circuit is 430MHZ (megahertz), and adjustable frequency point ranges is 400～470MHZ (megahertz).The inhibition ability that this circuit is exported first secondary lobe to radio frequency can reach 35dB (decibel), has overcome the interference of radio frequency output.And adopted orthogonal PSK modulator and antenna to drive the amplifying circuit integrated design, and designed and had the control of degenerative automatic frequency and automatic phase is controlled (AFC/APC) mixed circuit, so, had higher P/C ratio, reduced cost again.
The digital video modulation of suppressed sidelobes of the present utility model and day line drive circuit comprise orthogonal PSK modulator, coupling circuit and 65MHz filter, 430MHZ upconverter, programmable antenna driving amplifier, automatic frequency control and the automatic phase control mixed circuit of being made up of programmable digital QPSK/16-QAM modulator and processor controls; Wherein, the QPSK/16-QAM modulator, coupling circuit and 65MHz filter, the 430MHZ upconverter, the programmable antenna driving amplifier is connected in series in proper order, the gain controlling bus of QPSK/16-QAM modulator directly connects the control input end of programmable antenna driving amplifier, the antenna duplexer of the output termination outside of programmable antenna driving amplifier, the feedback signal output termination automatic frequency control of programmable antenna driving amplifier and the input of automatic phase control mixed circuit, processor controls in the output termination orthogonal PSK modulator of automatic frequency control and automatic phase control mixed circuit, processor controls is connected with the QPSK/16-QAM modulator with the Serial Control bus by direct control line.
The model of programmable digital QPSK/16-QAM modulator chip is AD9853, on this single chip integrated high speed Direct Digital Frequency Synthesizers (DDS), high-performance high-speed digital-analog converter (DAC), digital filter and other DSP functions have constituted a complete and formula digital modulator device able to programme flexibly.New standard is adopted in the manufacturing of AD9853 modulator chip based on advanced CMOS technology and on the cmos digital modulator performance.The AD9853 modulator chip has programmable functions and directly exports digital programmable antenna driving amplifier to providing.
Coupling circuit and 65MHz filter circuit adopt the low-pass filter circuit of the oval 50 Ω impedances in seven rank.
The model of 430MHZ upconverter chip is LT5511, and this chip can satisfy the wireless transmitting system requirement of high linearity, and it comprises a differential local oscillator buffer amplifier and double balanced mixer.Its LO (local oscillator), RF (radio frequency) can mate with the different amplifiers of wide frequency range at an easy rate with IF (input intermediate frequency) port.This high performance local oscillation buffer allows to use this single-ended machine oscillator source, does not need to use balun.
Automatic frequency control and automatic phase control (AFC/APC) mixed circuit adopt 10～500MHz amplifier MAX2471, it is the SOT23-6 Plastic Package, 6 pins, its inside comprise input buffer amplifier, output homophase and rp-drive and bias control circuit.
Programmable antenna driving amplifier circuit design is made up of " the low noise radio frequency amplifier of 300MHz～1.0G " and " 200MHz～1.0G radio-frequency power driving amplifier ", be directly used in low-cost monitoring transducer/actor network node apparatus, and the low-power consumption antenna of visible wireless electricity intercom drives.
Beneficial effect: at present, the low-cost monitoring wireless senser/actor network node of field work environment does not have that video image obtains and transfer function.
Short distance visible wireless electricity intercom poor performance and unstable properties are of low quality as the picture transmission that receives cheaply, have serious " hangover " phenomenon, and radio frequency output serious interference.Its main cause comprises, is not with degenerative automatic frequency control and automatic phase control (AFC/APC), causes the accuracy of tranmitting frequency and stability not high.In addition, first secondary lobe of modulator radio frequency output can not be suppressed effectively, and emission spectrum purity is not high, causes harmonic wave and noise jamming serious.
The utility model both provided solution for video monitoring wireless senser/actor network design of node low-cost, resource-constrained, provided solution for the raising of short distance visible wireless intercom P/C ratio cheaply again.
The utility model: 1. adopted digital quadrature phase-shift keying modulation (QPSK) mode; 2. adopted orthogonal PSK modulator and antenna to drive the amplifying circuit integrated design; 3. adopted and be with degenerative automatic frequency control (AFC) and automatic phase control (APC) mixed circuit.So, realize the digital quadrature phase-shift keying modulation of vision signal, improved the accuracy and the stability of emission frequency, suppressed radio frequency effectively and exported first secondary lobe, overcome radio frequency interference, reduced cost simultaneously again.
The utility model can be realized input signal is done the orthogonal phase shift modulation, and automatic frequency control (AFC) and automatic phase control (APC) mixing control, by upconverter intermediate-freuqncy signal being promoted is the 430MHZ radio frequency, and the inhibition ability that makes radio frequency export first secondary lobe can reach 35dB, also can carry out power drive and amplify, directly connect the aerial radiation uhf electromagnetic wave it.
Description of drawings
Fig. 1 is a functional-block diagram of the present utility model.
Fig. 2 is the embodiment electrical schematic diagram of " orthogonal PSK modulator ".
Fig. 3 is the embodiment electrical schematic diagram of " coupling circuit and 65MHz low pass filter ".
Fig. 4 is the embodiment electrical schematic diagram of " 430MHZ upconverter ".
Fig. 5 is the embodiment electrical schematic diagram of " AFC/APC mixed circuit ".
Fig. 6 is the embodiment electrical schematic diagram of " programmable antenna driving amplifier ".
Embodiment
Fig. 1 is a functional-block diagram of the present utility model.It is made up of orthogonal PSK modulator, coupling circuit and 65MHz filter circuit, 430MHZ upconverter, automatic frequency control and automatic phase control (AFC/APC) mixed circuit, programmable antenna driving amplifier etc.
(1) orthogonal PSK modulator
Fig. 2 is the embodiment electrical schematic diagram of " orthogonal PSK modulator ".Orthogonal PSK modulation is to add a digital controlled signal at its input, and modulation sends the phase place of carrier wave, and the number of phases of modulation is not limited only to (in the phase shift keying PSK mode) two, and orthogonal phase shift modulation (QPSK) just is being based on this principle.Utilize QPSK, carrier wave can carry four kinds of different phase shifts (4 chips), and each chip is represented 2 binary system bytes again.This modulation system makes same carrier wave can transmit the information of 2 bits but not 1 original bit, thereby the band efficiency of carrier wave is doubled.
The orthogonal PSK modulator adopts digital QPSK/16-QAM modulator AD9853 chip, characteristic that it has and function: 1. adopt the MQFP-44 pin package; 2. 165MHz internal reference time clock feature; 3. formation pulse FIR filter able to programme and programmable interpolated filter; 4. FSK/QPSK/DQPSK/16-QAM/D16-QAM modulation format (DQPSK differential quadrature phase conversion modulation); 5. single supply 3.3～5V; 6. low-power consumption 750mW (in full clock speed, during the 3.3V power supply).
" REF CLK IN " end of reference clock input AD9853 chip.Video serial data signal to be sent inputs to " DATA IN " end of AD9853 chip as digital controlled signal, and is subjected to the signal controlling of " TX ENABLE ", constitutes the effective input traffic of pulse frame.Various emission parameters comprising input data transfer rate, modulation system, FEC and randomizer structural arrangements and some other modulation function parameters, are programmed into the AD9853 chip through the Serial Control bus.Also have the forward error correction mode direct control line of warp such as enable, reset to enter into the AD9853 chip.Direct Digital Frequency Synthesizers DDS in the AD9853 chip (direct digital synthesizer) has transmitted the digital modulation sine and cosine carrier signal through modulating coder I/Q data channel, and DDS is by the de-tuned AD9853 outgoing carrier of the control bus frequency (f in the chip
OUT).In the AD9853 chip, signal processing is all carried out with digital form, and the rear end part D/A converter in the AD9853 chip is that the modulated carrier signal that digital signal converts simulation to is delivered in the driver amplifier." 24 " of AD9853 chip, " 25 " pin provide the electric current output of modulated carrier signal.
(2) coupling circuit and 65MHz filter circuit
Fig. 3 is the embodiment electrical schematic diagram of " coupling circuit and 65MHz low pass filter ".Coupling circuit and 65MHz filter adopt the low-pass filter circuit of the oval 50 Ω impedances in seven rank.
(3) 430MHZ upconverter
Fig. 4 is the embodiment electrical schematic diagram of " 430MHZ upconverter ".Upconverter promotes intermediate-freuqncy signal and is the 430MHZ radio frequency, and the model of 430MHZ upconverter chip is LT5511, and its LO (local oscillator) buffer is made up of high speed differential amplifier and amplitude limiter, is used for driving the frequency mixer of high linearity.LO+ and LO-pin are designed to difference or single-ended drive.The IF intermediate frequency is input as 10～300MHz, and the local oscillator input power is-15～-5dBm, the local oscillation buffer drive level is-10dBm; Conversion gain-0.7～0dB, P1dB is 5.9dBm, and IIP3 is 17dBm, and monolateral band noise factor is 15dB, and supply voltage is 4.0～5.25V.The local oscillator incoming frequency is 400～2700MHz, and the radio frequency output frequency is 400～3000MHz, can finish the operation of broadband RF radio frequency and IF intermediate frequency.
(4) automatic frequency control and automatic phase control (AFC/APC) mixed circuit
Fig. 5 is the embodiment electrical schematic diagram of " AFC/APC mixed circuit ".Automatic frequency control and automatic phase control (AFC/APC) mixed circuit are considered design and development at following 2: 1. improve emission spectrum purity, effectively first secondary lobe of suppressed modulator radio frequency output.2. modulator and upconverter and antenna drive and have degenerative automatic frequency control and automatic phase control (AFC/APC) between the amplifying circuit, to improve the accuracy and the stability of tranmitting frequency.
The AFC/APC mixed circuit adopts 10～500MHz amplifier MAX2471, and Amplifier Gain is 9～14dB, and noise factor is 10dB, and has the anti-phase isolation of 64dB.MAX2471 is the SOT23-6 Plastic Package, 6 pins, and its inside comprises input buffer amplifier, output homophase and rp-drive and bias control circuit.
(5) programmable antenna driving amplifier
Fig. 6 is the embodiment electrical schematic diagram of " programmable antenna driving amplifier ".Programmable antenna driving amplifier circuit design is made up of " the low noise radio frequency amplifier of 300MHz～1.0G " and " 200MHz～1.0G radio-frequency power driving amplifier ".
The model of the low noise radio frequency amplifier of 300MHz～1.0G is MBC13720 (production of U.S. Freescale company), and the low noise radio frequency that can satisfy 300MHz～1.0G frequency range amplifies its operating voltage 2.5～3.0V.Chip adopts the SOT-363 encapsulation, and 6 pins, chip internal comprise an amplifier, a switch and a bias control circuit.
The model of 200MHz～1.0G radio-frequency power driving amplifier is AD8353 (ADI's production), adopt the CP-8 encapsulation, 8 pins, it is the linear amplifier of a kind of broadband, fixed gain, the scope of design work frequency is 200MHz～1.0G, the impedance of input/output terminal is 50 Ω, is used for low-cost monitoring transducer/actor network node apparatus, and the low-power consumption antenna of visible wireless electricity intercom drives.
Circuit connecting relation
Contrast Fig. 2, the pin " 1 " of orthogonal PSK modulator 1IC1 (adopting digital QPSK/16-QAM modulator AD9853 chip), " 5 ", " 6 ", " 7 ", " 9 ", " 10 ", " 12 ", " 13 ", " 16 ", " 19 ", " 23 ", " 28 ", " 36 ", " 39 ", " 44 " connect ground (GND).The DVDD pin " 2 " of 1IC1, " 8 ", " 37 ", " 40 ", " 43 " connect the DUT+V end, and the AVDD pin " 20 " of 1IC1, " 22 " connect the DUT+V end, and PLL VCC pin " 14 " connects the DUT+V end, and FECEN connects ground (GND).The FEC NE pin " 5 " of 1IC1 connects the positive 5V of power supply through the second pull-up resistor 1R2, PLL FILTER pin " 15 " is connected DUT+V through series resistance 1R3 with series capacitance 1C11, DAC REST pin " 18 " connects ground (GND) through the first earth resistance 1R4, DACBL pin " 21 " connects the DUT+V end through being communicated with electric capacity 1C3, and the DUT+V end connects ground (GND) through first～the 6th anti-tampering electric capacity 1C5～1C10.
Contrast Fig. 2, the IOUT pin " 24 " of 1IC1 connects the input " 1 " of electromagnetic coupled transformer 1T1, IOUTB pin " 25 " connects the input " 3 " of electromagnetic coupled transformer 1T1, " 3 " end of electromagnetic coupled transformer 1T1 is connected ground (GND), postemphasis the resistance 2R1 and the first filter inductance 2L1 in output " 4 " connection " coupling circuit and 65MHz filter circuit " of electromagnetic coupled transformer 1T1 with " 6 " end.
Contrast Fig. 2, the TSTDATAIN pin " 29 " of 1IC1 connects " 2 " end of switch 1SW1, " 1 " end of switch 1SW1 connects ground (GND), TSTDATA OUT pin " 31 " connects " 3 " end of switch 1SW1, the DATA IN pin " 41 " of 1IC1 receives serial data input sdi signal, and the serial data input sdi signal of reception connects the positive 5V of power supply through the first pull-up resistor 1R1.The DVDD pin " 43 " of 1IC1 connects the first isolation capacitance 1C1 and the second isolation capacitance 1C2.
Contrast Fig. 2,1IC2 are that (model: OSC05), its pin " 14 " connects the positive 5V of power supply to the crystal oscillator device, and pin " 7 " connects ground (GND), and clock oscillation signal output pin " 8 " connects the REF CLK IN pin " 38 " of orthogonal PSK modulator 1IC1.The pin of 1IC2 " 8 " connects the second earth resistance 1R5.
Contrast Fig. 3, the first filter inductance 2L1, the second filter inductance 2L2, the 3rd filter inductance 2L3 are connected in series, the first filter capacitor 2C1, the second filter capacitor 2C2, the 3rd filter capacitor 2C3 are connected in series, and with the first filter inductance 2L1, the second filter inductance 2L2, the 3rd filter inductance 2L3 corresponding connection mutually.The first shunt capacitance 2C4, the second shunt capacitance 2C5, the 3rd shunt capacitance 2C6 and the first filter inductance 2L1, the second filter inductance 2L2, the 3rd filter inductance 2L3 correspondence are connected.The resistance 2R1 ground connection of postemphasising.The other end of the 3rd filter inductance 2L3 connects the first coupling capacitance 3C1 in " 430MHZ upconverter ".
Contrast Fig. 4, " 4 " end of the first transformer 3T1 in " 430MHZ upconverter " connects the first coupling capacitance 3C1, " 5 " end ground connection." 3 " end of the first transformer 3T1 connects the 3rd earth resistance 3R2 through the second coupling capacitance 3C2, and (model: IF+ pin " 4 " LT5511) is connected with frequency mixer 3IC1." 1 " end of the first transformer 3T1 connects the 4th earth resistance 3R1 through the 3rd coupling capacitance 3C3, and is connected with the IF-pin " 5 " of frequency mixer 3IC1.
Contrast Fig. 4, the LO-pin " 1 " of frequency mixer 3IC1 connects the 6th coupling capacitance 3C6, the pin of 3IC1 " 2 ", " 3 ", " 6 ", " 8 ", " 9 ", " 11 ", " 14 " ground connection.The pin of 3IC1 " 7 " connects the 4th coupling capacitance 3C4, pin " 10 " connects controlling resistance 3R4, and the RF-pin " 12 " of 3IC1 connects the second coupling inductance 3L2, and RF+ (pin " 1 ") connects the first coupling inductance 3L1, the pin of 3IC1 " 15 " connects the 8th coupling capacitance 3C8, and meets V
CCPower supply, the 8th coupling capacitance 3C8 and the corresponding connection of the 9th coupling capacitance 3C9.The pin of 3IC1 " 16 " connects the 7th coupling capacitance 3C7, the 7th coupling capacitance 3C7 and the corresponding connection of the 5th earth resistance 3R3.
Contrast Fig. 4, the end of the first coupling inductance 3L1 connects " 3 " end of the second transformer 3T2, the end of the second coupling inductance 3L2 connects " 1 " end of the second transformer 3T2, and " 2 " end of 3T2 is through the tenth coupling capacitance 3C10 ground connection, and 3T2 " 2 " end connects V simultaneously
CCPower supply." 4 " end of 3T2 is through the 11 coupling capacitance 3C11 ground connection, " 5 " end of 3T2 is through the 12 coupling capacitance 3C12 ground connection, simultaneously, 3T2 " 5 " end exports the connection of first in " programmable antenna driving amplifier " electric capacity 5C1 to by the 13 coupling capacitance 3C13.
Fig. 5 is " an AFC/APC mixed circuit ".Contrast Fig. 5, the 4IC1 chip adopts 10～500MHz amplifier, and model is MAX2471.The OUT1 pin " 1 " of 4IC1 exports the pin " 42 " of orthogonal PSK modulator 1IC1 to through the first electric capacity 4C1, and the OUT1 pin " 3 " of 4IC1 exports the pin " 11 " of 1IC1 to through the second electric capacity 4C2.The pin of 4IC1 " 2 " connects ground.
Contrast Fig. 5, second two ends that connect inductance 5L2 from " programmable antenna driving amplifier " connect the 5th electric capacity 4C5 and the 6th electric capacity 4C6 respectively, and through the 5th electric capacity 4C5, the 6th electric capacity 4C6, input is connected to the IN1 pin " 5 " of 4IC1 and the IN2 pin " 4 " of 4IC1.The other end of the 5th electric capacity 4C5 and the first resistance 4R1, the 7th electric capacity 4C7 interconnect.The 3rd resistance 4R3, the 4th resistance 4R4 and the 8th electric capacity 4C8 interconnect.
Contrast Fig. 5, the pin of 4IC1 " 6 " connection+5V power supply, and interconnect with the 3rd electric capacity 4C3 and the 4th electric capacity 4C4.
Contrast Fig. 6, first in " programmable antenna driving amplifier " connect electric capacity 5C1 and first and connect corresponding connection of RFIN pin " 6 " that inductance 5L1, the 3rd connects electric capacity 5C3 and 5IC2 chip.The 5IC2 chip is the low noise radio frequency amplifier, and frequency range is 300MHz～1.0G, and model is MBC13720.The pin of 5IC2 " 5 " connects ground, and the EN1 pin " 4 " of 5IC2 is connected the corresponding connection of resistance 5R3 with pin " 1 ", the 3rd.The pin of 5IC2 " 2 " connects resistance 5R2 through second and connects electric capacity 5C6, the 7th connection electric capacity 5C7 and the corresponding connection of the second connection inductance 5L2 with the 6th respectively.The pin of 5IC2 " 1 " connects resistance 5R1 with first respectively, the 5th connection electric capacity 5C5, the 4th connects the corresponding connection of electric capacity 5C4.Second connects inductance 5L2 connects electric capacity 5C7 and is connected the corresponding connection of resistance 5R2 with second with the first connection resistance 5R1, the 8th connection electric capacity 5C8, the 6th connection electric capacity 5C6, the 7th respectively.The 8th an other end that connects electric capacity 5C8 is connected electric capacity 5C9 and interconnects with the 9th.
Contrast Fig. 6, the 5IC1 chip is the radio-frequency power driving amplifier, and frequency range is 200MHz～1.0G, and model is AD8353.The INPUT pin " 3 " of 5IC1 connects the 9th and connects electric capacity 5C9." 1 " of 5IC1, " 4 ", " 5 ", " 8 " connect ground.The V of 5IC1
POSPin " 6 " is connected electric capacity 5C11, the 12 with+5V power supply respectively and connects electric capacity 5C12, the 3rd and connect the corresponding connection of inductance 5L3 with the 11.The V of 5IC1
OUTPin " 7 " connects electric capacity 5C10 through the tenth and is connected to antenna duplexer, and radiofrequency signal is launched through antenna then.
Claims (6)
1. modulation of the digital video of a suppressed sidelobes and day line drive circuit is characterized in that this modulator comprises orthogonal PSK modulator (1), coupling circuit and 65MHz filter (2), 430MHZ upconverter (3), programmable antenna driving amplifier (4), automatic frequency control and the automatic phase control mixed circuit of being made up of programmable digital QPSK/16-QAM modulator (11) and processor controls (12) (5); Wherein, QPSK/16-QAM modulator (11), coupling circuit and 65MHz filter (2), 430MHZ upconverter (3), programmable antenna driving amplifier (4) order is connected in series, the gain controlling bus of QPSK/16-QAM modulator (11) directly connects the control input end of programmable antenna driving amplifier (4), the antenna duplexer of the output termination outside of programmable antenna driving amplifier (4), the feedback signal output termination automatic frequency control of programmable antenna driving amplifier (4) and the input of automatic phase control mixed circuit (5), processor controls (12) in the output termination orthogonal PSK modulator (1) of automatic frequency control and automatic phase control mixed circuit (5), processor controls (12) is connected with QPSK/16-QAM modulator (11) with the Serial Control bus by direct control line.
2. modulation of the digital video of suppressed sidelobes according to claim 1 and day line drive circuit is characterized in that the model of described programmable digital QPSK/16-QAM modulator (11) is AD9853.
3. modulation of the digital video of suppressed sidelobes according to claim 1 and day line drive circuit is characterized in that described coupling circuit and 65MHz filter (2) adopt the low-pass filter circuit of the oval 50 Ω impedances in seven rank.
4. modulation of the digital video of suppressed sidelobes according to claim 1 and day line drive circuit is characterized in that the model of described 430MHZ upconverter (3) is LT5511, and this chip comprises a differential local oscillator buffer amplifier and double balanced mixer.
5. a modulation of the digital video of suppressed sidelobes according to claim 1 and a day line drive circuit, it is characterized in that described automatic frequency control and automatic phase control mixed circuit (5) adopt 10～500MHz amplifier MAX2471, it is the SOT23-6 Plastic Package, 6 pins, its inside comprise input buffer amplifier, output homophase and rp-drive and bias control circuit.
6. the digital video of a suppressed sidelobes according to claim 1 modulation and a day line drive circuit is characterized in that described programmable antenna driving amplifier (4) design is made up of " the low noise radio frequency amplifier of 300MHz～1.0G " and " 200MHz～1.0G radio-frequency power driving amplifier ".
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNU200820161709XU CN201294514Y (en) | 2008-09-25 | 2008-09-25 | Video digital modulation capable of restraining minor lobe and antenna drive circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820161709XU CN201294514Y (en) | 2008-09-25 | 2008-09-25 | Video digital modulation capable of restraining minor lobe and antenna drive circuit |
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| CN201294514Y true CN201294514Y (en) | 2009-08-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106207397A (en) * | 2016-09-26 | 2016-12-07 | 江苏天安智联科技股份有限公司 | Vehicle-mounted 4G has resource integrated gain antenna |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106207397A (en) * | 2016-09-26 | 2016-12-07 | 江苏天安智联科技股份有限公司 | Vehicle-mounted 4G has resource integrated gain antenna |
| CN106207397B (en) * | 2016-09-26 | 2021-07-09 | 江苏天安智联科技股份有限公司 | Vehicle-mounted 4G active integrated gain antenna |
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