CN202737863U - Radio communication circuit - Google Patents
Radio communication circuit Download PDFInfo
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- CN202737863U CN202737863U CN2012204489564U CN201220448956U CN202737863U CN 202737863 U CN202737863 U CN 202737863U CN 2012204489564 U CN2012204489564 U CN 2012204489564U CN 201220448956 U CN201220448956 U CN 201220448956U CN 202737863 U CN202737863 U CN 202737863U
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Abstract
The utility model discloses a radio communication circuit. The radio communication circuit comprises a single-chip wireless MCU, an RF power transmitting unit, an antenna impedance match unit, an RF difference receiving unit and a data storing unit, wherein the single-chip wireless MCU transmits a signal to the RF power transmitting unit, the RF power transmitting unit filters the signal and then sends the signal to the antenna impedance match unit, and the signal is emitted by connecting the antenna impedance match unit with an antenna. External terminal equipment transmits a signal to the antenna impedance match unit via the antenna, the antenna impedance match unit carries out filtration and de-noising on the signal and then sends the signal to the RF difference receiving unit, and the RF difference receiving unit converts the signal into a difference signal and then transmits the difference signal to the single-chip wireless MCU. The radio communication circuit can effectively control radio frequency noises, improves signal reception sensitivity, and solves the problem of signal emission impedance match, wherein the amount of peripheral devices in the whole circuit is relatively small so that low power consumption of the circuit is realized.
Description
Technical field
The utility model relates to a kind of telecommunication circuit, particularly a kind of radio communication circuit.
Background technology
Existing micro power radio communication circuit all is to adopt a radio frequency chip and a MCU chip to form, MCU is sent to radio frequency chip with information, by radio frequency chip this information exchange is crossed communication and transfer to external equipment, external equipment is sent to radio frequency chip with control information, and being communicated by letter with MCU by radio frequency chip transfers to MCU with control information again.Its peripheral components is more, and circuit structure is complicated, and circuit power consumption is higher, is unfavorable for the radiofrequency signal modulation.Simultaneously, the technological problems during owing to the pcb board welding production causes its signal receiving sensitivity relatively poor.
The utility model content
The purpose of this utility model provides the higher radio communication circuit of a kind of signal receiving sensitivity.
This radio communication circuit that the utility model provides, comprise the wireless MCU of single-chip, RF power transmitting element, Antenna Impedance Matching unit, RF differential received unit and data storage cell, the wireless MCU of described single-chip reaches RF power transmitting element with signal, by it signal is carried out being sent to the Antenna Impedance Matching unit after filtering is processed, connect antenna by it signal is sent; Exterior terminal equipment reaches described Antenna Impedance Matching unit by antenna with signal, is sent to the wireless MCU of described single-chip after via this unit signal being carried out behind the filtering and noise reduction converting signal to differential signal by described RF differential received unit; The wireless MCU of described single-chip and data storage cell carry out data communication.
The wireless MCU of described single-chip is the wireless MCU of super low-power consumption single-chip that adopts Silicon Labs company to produce, and its model is Si1000.
The utility model has adopted the wireless MCU of single-chip, by its to the control of each functional unit with communicate by letter, can effectively control radio noise, improve signal receiving sensitivity; By the Antenna Impedance Matching unit signal is sent the PA impedance and carry out the design of 50 Ω coupling, efficiently solve the problem of signal emission impedance matching.Whole circuit peripheral components is less, and its typical quiescent current has realized the low-power consumption of circuit less than 0.1uA.
Description of drawings
Fig. 1 is functional block diagram of the present utility model.
Fig. 2 is the circuit diagram of Antenna Impedance Matching of the present utility model unit.
Fig. 3 is the circuit diagram of RF differential received of the present utility model unit.
Fig. 4 is the circuit diagram of RF power transmitting element of the present utility model.
Fig. 5 is the wireless MCU control circuit of single-chip of the present utility model figure.
Fig. 6 is data storage cell circuit diagram of the present utility model.
Embodiment
As shown in Figure 1, the utility model comprises the wireless MCU of single-chip, RF power transmitting element, Antenna Impedance Matching unit, RF differential received unit and data storage cell.The wireless MCU of single-chip transmits a signal to the Antenna Impedance Matching unit by RF power transmitting element, and this unit connects antenna and just signal sent.When receiving signal, aerial signal enters the Antenna Impedance Matching unit by antenna, receives through RF differential received unit again, reaches the wireless MCU of single-chip again.This wireless MCU and data storage cell carry out data communication, and critical data information is carried out storage backup.
The utility model adopts the wireless MCU of single-chip of an integrated radio frequency chip and 8051 single-chip microcomputers, and its model is Si1000.By internal software register, radio frequency initialization etc. is carried out code and write, simple peripheral Analog Circuit Design just can realize the micropower wireless data transmission function in addition.
The wireless MCU of this piece single-chip that adopts is the wireless MCU of a super low-power consumption, package size 5mm * 7mm, integrated 8 C8051F9xx kernels of high-performance, and the intrinsic RF transceiver that comprises inner low noise amplifier (LNA) and power amplifier (PA), high transmit power can reach+20dBm@85mA, and receiving sensitivity can reach-121dBm.
Transfer of data of the present utility model is used semiduplex communication pattern, circuit work frequency 490-505MHz, and the RF signal adopts FSK, GFSK and three kinds of compound modulations of OOK, carries out RFDC, and the RF effective speed can reach 256kbps.
As shown in Figure 2, the Antenna Impedance Matching unit comprises ANT antenna hardware interface, antenna static lightning strike protection pipe D3, pi type filter and radio-frequency (RF) switch pipe D2.Capacitor C 1, inductance L 1 and capacitor C 2 have formed pi type filter, are the Butterworth LPF of a N=3, and its passband insertion loss is minimum to be 0.25dB.Wireless signal enters the Antenna Impedance Matching unit by ANT antenna hardware interface, reaches coupling capacitance C3 via pi type filter again and carries out the high-frequency signal coupling, then accesses 5 pin of radio-frequency (RF) switch pipe D2.1 pin of radio-frequency (RF) switch pipe D2 is connected to RF differential received unit, its 2 pin ground connection, and its 3 pin is connected to RF power transmitting element by capacitor C 6; Its 4 pin is by capacitor C 4 ground connection, and simultaneously, its 4 pin links to each other with 26 pin of wireless MCU; Its 6 pin is by capacitor C 5 rear ground connection, and its 6 pin links to each other with 25 pin of wireless MCU simultaneously.
This partial circuit improves the EMC except being used for, and one group of designed low pass filter also is used for improving the RF signal.Simultaneously, in order to improve the frequency characteristic of low-pass first order filter, adopt the above higher order filter of second order.Antenna low pass filter (pi type filter among the figure) is used for filtering the external noises such as high-frequency signal, high order harmonic component.
Simultaneously, in order to improve the receiving sensitivity of micro power radio module, the utility model has adopted the 50 Ω coupling antenna in the antenna match design, thereby can well be with circuit criteria.This partial circuit parameter satisfies antenna impedance 50 Ω match circuit networks foremost.
As shown in Figure 3, RF reception difference unit is comprised of capacitor C 10, inductance L 5 and capacitor C 11.The signal that is transmitted by the Antenna Impedance Matching unit passes through capacitor C 10 series inductance L5, again ground connection behind the series capacitance C11; Signal is connected to 18 pin of the wireless MCU of single-chip from 1 pin of inductance L 5,2 pin of inductance L 5 are connected to 19 pin of this MCU, forms thus RF and receives differential signal.Wherein, the condensance of capacitor C 10 and capacitor C 11 has consisted of the inside conversion scale relation of differential signal.Therefore, wireless signal does not rely on signal ground, and the design of RF differential signal line is stronger to outside EMI immunocompetence than the design of single-ended signal line.
As shown in Figure 4, RF power transmitting element comprises the T-shaped low-pass filter network of chebyshev low-pass filter and 3 rank.Power vd D3V3 is connected to 16 pin of the wireless MCU of single-chip, and this power supply is connected between power vd D3V3 and the ground after capacitor C 12, capacitor C 13, capacitor C 14 and capacitor C 15 parallel connections by 17 pin of this MCU of access behind the resistance R 2 series inductance L6 simultaneously.The signal that is spread out of by the Antenna Impedance Matching unit by chebyshev low-pass filter of a T-shaped low-pass filter network series connection in 3 rank after, be connected to 17 pin of this MCU after the Low ESR signal coupling capacitor C 9 of connecting again.Wherein, inductance L 2, inductance L 3 and capacitor C 7 form the T-shaped low-pass filter network in 3 rank; Capacitor C 8, inductance L 4 and resistance R 1 form chebyshev low-pass filter.
The utility model has used MCU chip internal PA, simulates 50 Ω impedance matchings by software code realization, and simultaneously, the peripheral resistance R 1 of MCU is designed to 50 Ω antenna match as the outside build-out resistor of its inner PA, i.e. resistance R 1=50 Ω, thereby optimizing power transmission.Whole transtation mission circuit partial design has guaranteed that radiofrequency signal can distortionless emission be coupled to antenna, thereby signal has been transmitted in the air.
As shown in Figure 5, single-chip is wireless, and the MCU control unit mainly is the design of power pack, and its peripheral components seldom.1 pin of the wireless MCU of single-chip is connected to its 42 pin by crystal oscillator XL2; Its 12 pin connects 2 pin of passive crystal oscillator XL1, and its 13 pin connects 1 pin of passive crystal oscillator XL1,3 pin of passive crystal oscillator XL1 and the equal ground connection of 4 pin; 23 pin of this wireless MCU and the equal ground connection of 44 pin.Its 24 pin connects the GPIO0 signal, and its 25 pin connects the GPIO1 signal, and its 26 pin connects the GPIO2 signal; Its 27 pin is by capacitor C 16 ground connection, is connected between its 27 pin and the ground after capacitor C 17 and capacitor C 16 are in parallel, and its 28 pin passes through capacitor C 18(0.1 μ F) ground connection, reference power source VDD_REF links to each other with 28 pin of this wireless MCU.The 31 pin access reception of data signal RX0 of this MCU, its 32 pin receives and sends data-signal TX0, its 35 pin meets simulation earth signal AGND, its 43 pin ground connection, capacitor C 19 and capacitor C 20(0.1 μ F) be connected between its 38 pin and 37 pin after the parallel connection, chip power VDD_MCU is by capacitor C 20 rear ground connection, and 39 pin of this wireless MCU meet signal DC, its 40 pin meets signal DD, namely is connected to 2 pin of the memory D9 of data storage cell.Chip power VDD_MCU and reference power source VDD_REF are obtained by the filtering of power vd D3V3 dividing potential drop, that is: power vd D3V3 obtains chip power VDD_MCU after by resistance R 3, and 2 pin of resistance R 3 are by capacitor C 21 ground connection; Power vd D3V3 obtains reference power source VDD_REF after by resistance R 4, and 2 pin of resistance R 4 are by capacitor C 22 ground connection.
Except the design of said chip power pack, the utility model adopts 4 layers of PCB design, digitally DGND in the circuit design, digital power voltage DVCC, reference voltage AFE simulates ground AGND and digitally adds the magnetic bead inductance between the DGND, so that rated current is not less than 2A, dc impedance is as far as possible little, thereby can stop noise crosstalk interference between the printed board network.
As shown in Figure 6, data storage cell comprises a memory D9, chip power VDD_MCU by on draw 1 pin of controlling resistance R6 incoming memory D9, simultaneously its by on draw 41 pin of the wireless MCU of access behind the controlling resistance R6; This power supply signal by on draw 3 pin of controlling resistance R28 incoming memory D9; This power vd D_MCU by on draw 5 pin of controlling resistance R5 incoming memory D9, simultaneously its by on draw 2 pin of the wireless MCU of access behind the controlling resistance R5; This power supply signal is connected to 4 pin of memory D9, and capacitor C 23 is connected between 4 pin and ground of memory D9; The 2 pin ground connection of memory D9 are connected to 40 pin of wireless MCU simultaneously.
The control of memory can only be used the P2 port of wireless MCU, can not use its P0 port.This partial circuit mainly is to realize storing based on 8051 I2C bus data by software, thereby some glue file that guarantees communication module can not lost when system power failure.These files comprise firmware, network node address, subnet interstitial content and address etc.
Claims (2)
1. radio communication circuit, it is characterized in that, comprise the wireless MCU of single-chip, RF power transmitting element, Antenna Impedance Matching unit, RF differential received unit and data storage cell, the wireless MCU of described single-chip reaches RF power transmitting element with signal, by it signal is carried out being sent to the Antenna Impedance Matching unit after filtering is processed, connect antenna by it signal is sent; Exterior terminal equipment reaches described Antenna Impedance Matching unit by antenna with signal, is sent to the wireless MCU of described single-chip after via this unit signal being carried out behind the filtering and noise reduction converting signal to differential signal by described RF differential received unit; The wireless MCU of described single-chip and data storage cell carry out data communication.
2. radio communication circuit according to claim 1 is characterized in that, the wireless MCU of described single-chip is the wireless MCU of super low-power consumption single-chip that adopts Silicon Labs company to produce, and its model is Si1000.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012204489564U CN202737863U (en) | 2012-09-05 | 2012-09-05 | Radio communication circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012204489564U CN202737863U (en) | 2012-09-05 | 2012-09-05 | Radio communication circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202737863U true CN202737863U (en) | 2013-02-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012204489564U Expired - Lifetime CN202737863U (en) | 2012-09-05 | 2012-09-05 | Radio communication circuit |
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| Country | Link |
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| CN (1) | CN202737863U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105099487A (en) * | 2015-07-10 | 2015-11-25 | 成都弘毅天承科技有限公司 | Radio frequency module with power detection for smart homes |
| CN106411353A (en) * | 2016-11-22 | 2017-02-15 | 宁夏计算机软件与技术服务有限公司 | Low-power spread-spectrum wireless communication module and method thereof |
| CN110855304A (en) * | 2018-07-27 | 2020-02-28 | 珠海格力电器股份有限公司 | Signal transmission circuit and device |
-
2012
- 2012-09-05 CN CN2012204489564U patent/CN202737863U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105099487A (en) * | 2015-07-10 | 2015-11-25 | 成都弘毅天承科技有限公司 | Radio frequency module with power detection for smart homes |
| CN106411353A (en) * | 2016-11-22 | 2017-02-15 | 宁夏计算机软件与技术服务有限公司 | Low-power spread-spectrum wireless communication module and method thereof |
| CN110855304A (en) * | 2018-07-27 | 2020-02-28 | 珠海格力电器股份有限公司 | Signal transmission circuit and device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 410205 No. 468 west slope, Changsha hi tech Industrial Development Zone, Changsha, Hunan, Yuelu District, Tongzi Patentee after: HUNAN WEISHENG INFORMATION TECHNOLOGY CO.,LTD. Address before: 410205 No. 468 west slope, Changsha hi tech Industrial Development Zone, Changsha, Hunan, Yuelu District, Tongzi Patentee before: CHANGSHA WASION INFORMATION TECHNOLOGY Co.,Ltd. Address after: 410205 No. 468 west slope, Changsha hi tech Industrial Development Zone, Changsha, Hunan, Yuelu District, Tongzi Patentee after: WILLFAR INFORMATION TECHNOLOGY Co.,Ltd. Address before: 410205 No. 468 west slope, Changsha hi tech Industrial Development Zone, Changsha, Hunan, Yuelu District, Tongzi Patentee before: HUNAN WEISHENG INFORMATION TECHNOLOGY CO.,LTD. |
|
| CP01 | Change in the name or title of a patent holder | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130213 |
|
| CX01 | Expiry of patent term |