CN211509042U - Terminal module based on NB-IoT technology - Google Patents
Terminal module based on NB-IoT technology Download PDFInfo
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- CN211509042U CN211509042U CN202020534645.4U CN202020534645U CN211509042U CN 211509042 U CN211509042 U CN 211509042U CN 202020534645 U CN202020534645 U CN 202020534645U CN 211509042 U CN211509042 U CN 211509042U
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Abstract
The utility model discloses a terminal module based on NB-IoT technique, terminal module including the inside XY1100 chip that has integrateed MCU and NB-IoT radio frequency chip, the radio frequency switch chip, second order LC impedance matching circuit, second order Gaussian type low pass filter, second order Bessel band-pass filter, pi type impedance matching circuit, crystal oscillator matching circuit and power filter circuit, when carrying out the encapsulation with NB-IoT chip and general MCU, overcome the heat dissipation and cross talk, with power amplifier, the low noise amplifier encapsulation is in the chip the inside, make the chip possess full frequency channel NB-IoT communication, can satisfy the removal, UNICOM, the thing that the three big operators of telecommunications allied oneself with the network. Meanwhile, the MCU is opened in the chip, so that a user can develop software according to own application requirements, and the defect that the existing NB-IoT module cannot meet the requirements of three operators at the same time is optimized.
Description
Technical Field
The utility model relates to a wireless communication technology field specifically is a terminal module based on NB-IoT technique.
Background
With the development of the 5G communication technology, the large-scale application of the Internet of things becomes possible, the NB-IoT technology replaces the existing GSM network technology, low-speed and long-distance Internet of things communication can be realized, and the networking technology can be quickly realized depending on the existing cellular network technology and the base station of an operator, so that the interconnection of everything becomes practical, and the technology has a great significance in the directions of smart cities, four watches, security protection, agriculture and the like.
The existing NB-IoT module has poor heat dissipation effect when in use and is easy to cause crosstalk, in addition, the NB-IoT module can not simultaneously meet the networking of the Internet of things of different operators when networking the Internet of things, and MCU of the existing module manufacturer is not completely opened, thereby limiting the application range of NB-IoT technology.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a terminal module based on NB-IoT technique to solve the current NB-IoT module that proposes in the above-mentioned background art and can not satisfy the thing networking of different operators simultaneously when carrying out the network deployment to the thing networking, current module producer MCU is incomplete open moreover, has restricted NB-IoT technique's application range's problem.
In order to solve the technical problem, the utility model provides a following technical scheme: a terminal module based on NB-IoT technology comprises an XY1100 chip, a radio frequency switch chip, a second-order LC impedance matching circuit, a second-order Gaussian low-pass filter, a second-order Bessel band-pass filter, a pi-shaped impedance matching circuit, a crystal oscillator matching circuit and a power supply filter circuit, wherein the MCU and the NB-IoT radio frequency chip are integrated in the terminal module;
the radio frequency switch chip can switch and connect the circuit of the radio frequency common path part to the independent branch circuits required by different working states of the module according to different working states of the module, thereby ensuring the stability and reliability of the working paths of the module in different modes;
the second-order LC impedance matching circuit is responsible for matching the impedance of the radio frequency output pin of the XY1100 chip to 50 ohms;
the second-order Gaussian low-pass filter is responsible for filtering radio-frequency signals, ensuring that low frequency passes and inhibiting partial high-frequency harmonic waves;
the second-order Bessel band-pass filter further inhibits high-frequency harmonics of signals output by the Gaussian filter under the condition of ensuring a frequency output passband, and achieves the purpose that higher harmonics meet the requirements of related industry indexes;
the pi-type impedance matching circuit is responsible for allocating the link impedance from the input pin of the XY1100 chip to the radio frequency switch to 50 ohms;
the crystal oscillator matching circuit comprises two specifications, namely 38.4MHz and 32.768KHz, wherein the 38.4MHz crystal oscillator is used for serving an NB-IoT chip integrated in an XY1100 chip and providing frequency multiplication basic frequency for transmitting and receiving work of the XY1100 chip, and the 32.768KHz is used for serving a general MCU in the XY1100 chip and providing frequency reference for the work of an MCU timer;
the power supply filter circuit supplies power to the XY1100 chip for filtering, so that lower ripple waves of power supply input are ensured, and the receiving state sensitivity of the power supply filter circuit is increased.
Preferably, an output pin of the XY1100 chip is connected with a second-order LC impedance matching circuit, the second-order LC impedance matching circuit is connected with a second-order Gaussian low-pass filter, the second-order Gaussian low-pass filter is connected with a second-order Bessel band-pass filter, and the second-order Bessel band-pass filter is connected with an input pin at one end of the radio frequency switch chip to form a transmission radio frequency link; the other input pin of the radio frequency switch chip is connected with a pi-type impedance matching circuit, and the pi-type impedance matching circuit is connected with the input pin of the XY1100 chip to form a radio frequency receiving link; the crystal oscillator matching circuit is connected with the XY1100 chip; the power filter circuit is connected to XY 1100.
Preferably, the power supply and control pins of the radio frequency switch are connected into an XY1100 chip, and the XY1100 chip supplies power to the radio frequency switch and controls a circuit gating path of the radio frequency switch, so that the expected function of the module is achieved.
Preferably, the terminal module is designed by adopting a welding type metal shielding case, and the module sequence code SN and the network access permission number IMEI are printed on the metal shielding case by laser.
Compared with the prior art, the beneficial effects of the utility model are that:
the NB-IoT chip and the general MCU are packaged, meanwhile, heat dissipation and crosstalk are overcome, and the power amplifier and the low-noise amplifier are packaged in the chip, so that the chip has full-band NB-IoT communication, and the Internet of things networking of three operators, namely mobile operators, Unicom operators and telecom operators can be met. Meanwhile, the MCU is opened in the chip, so that a user can develop software according to own application requirements, the defect that the existing NB-IoT module cannot meet the requirements of three operators simultaneously is optimized, the defect that the existing module manufacturer does not completely open the MCU is broken, and the application range and the application scene of the NB-IoT technology are larger.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a block diagram of a communication link according to the present invention;
fig. 3 is a pin function table of the XY1100 chip of the present invention.
In the figure: 1. XY1100 chip; 2. a second-order LC impedance matching circuit; 3. a second order Gaussian low pass filter; 4. a second order bessel band-pass filter; 5. a radio frequency switch chip; 6. a pi-type impedance matching circuit; 7. a crystal oscillator matching circuit; 8. and a power supply filter circuit.
Detailed Description
The embodiment of the utility model provides a terminal module based on NB-IoT technique. The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Please refer to fig. 1-3, this embodiment provides the utility model a terminal module based on NB-IoT technology, the terminal module include XY1100 chip 1, radio frequency switch chip 5, second order LC impedance matching circuit 2, second order gaussian low pass filter 3, second order bessel type band pass filter 4, pi type impedance matching circuit 6, crystal oscillator matching circuit 7 and power filter circuit 8, XY1100 chip 1 has integrated general MCU and NB-IoT radio frequency chip inside, has carried out SIP encapsulation with general MCU chip and NB-IoT radio frequency chip, power amplifier, low noise amplifier. Compared with the traditional scheme of separating the power amplifier and the low noise amplifier into chips, the power amplifier has the advantages of extremely high volume and cost, and can ensure all network frequency bands and power output of the NB-IoT technology.
The model of the radio frequency switch chip 5 is CAN 1414; the second-order LC impedance matching circuit 2 is a common LC-second-order circuit as long as it can meet the use requirement.
An output pin of the XY1100 chip 1 is connected with a second-order LC impedance matching circuit 2, the second-order LC impedance matching circuit 2 is connected with a second-order Gaussian low-pass filter 3, the second-order Gaussian low-pass filter 3 is connected with a second-order Bessel-type band-pass filter 4, and an output end of the second-order Bessel-type band-pass filter 4 is connected with an input pin at one end of a radio frequency switch chip 5, so that a sending radio frequency link is formed; the other input pin of the radio frequency switch chip 5 is connected with a pi-type impedance matching circuit 6, and the pi-type impedance matching circuit 6 is connected with the input pin of the XY1100 chip 1 to form a receiving radio frequency link; the crystal oscillator matching circuit 7 is connected with the XY1100 chip 1; the power filter circuit 8 is connected to the power supply pins of XY 1100.
An output pin of the XY1100 chip 1 is connected with the second-order LC matching circuit 2 in series, and in order to achieve the optimal output of the radio frequency circuit, the second-order LC matching circuit 2 matches the characteristic impedance parameters of the radio frequency output pin of the XY1100 to radio frequency general 50-ohm impedance; the second-order LC matching circuit is connected with the second-order Gaussian low-pass filter 3 in series, when a radio-frequency signal is sent out, harmful higher harmonics still exist except for a desired frequency, and the second-order Gaussian low-pass filter 3 is designed into a 50-ohm characteristic impedance low-pass filter, so that the harmful higher harmonics can be reduced to a certain extent under the condition that a pass band is ensured; the second-order Gaussian low-pass filter is connected with the second-order Bessel-type band-pass filter 4 in series, and the signal output from the second-order Gaussian low-pass filter is slowly attenuated in a stop band and is not enough to reduce harmful higher harmonics to a desired value only by the Gaussian filter, so that the harmful higher harmonics are further reduced to reach the desired value while the pass band is ensured by the first-order 50-ohm characteristic impedance second-order Bessel-type band-pass filter; the output end of the second-order Bessel type band-pass filter 4 is connected with the radio frequency switch chip 5, and the radio frequency switch chip 5 can gate the XY1100 chip 1 → the second-order LC matching circuit 2 → the second-order Gaussian type low-pass filter 3 → the second-order Bessel type band-pass filter 4 → the radio frequency switch chip 5 in a sending state under the control of the XY1100 chip to send out a radio frequency signal; the other input pin of the radio frequency switch chip is connected with the pi-type impedance matching circuit 6 in series, the pi-type impedance matching circuit 6 is connected with the input pin of the XY1100 chip 1, and the radio frequency switch can gate a channel of the radio frequency switch chip 5 → the pi-type impedance matching circuit 6 → the XY1100 chip 1 in a receiving state under the control of the XY1100 chip and transmit a received signal to the XY1100 for modulation and demodulation; the XY1100 chip is connected with a crystal oscillator matching circuit 7, the crystal oscillator matching circuit comprises two specifications, namely 38.4MHz and 32.768KHz, wherein the 38.4MHz crystal oscillator serves an NB-IoT chip integrated in the XY1100 chip and provides frequency multiplication basic frequency for transmitting and receiving work of the XY1100 chip, and the 32.768KHz serves a general MCU service in the XY1100 chip and provides frequency reference for working of an MCU timer; the XY1100 chip is connected with the power supply filter circuit 8 and supplies power to the XY1100 chip 1 for filtering, so that the power supply input of the XY1100 chip 1 has lower ripple waves, and the receiving state sensitivity of the XY1100 chip is increased.
Preferably, the NB-IoT radio frequency module adopts a stamp half-hole LCC package which is more beneficial to machine SMT processing than the traditional paster mode; for reducing the work influence of module radio frequency circuit to external spurious radiation and external environment spurious radiation module, adopt the design of welded metal shield cover to the module to carry out laser printing to module sequence code SN, income net permit number IMEI on metal shield cover, increased the pleasing to the eye practicality of module when guaranteeing module operational reliability.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. A terminal module based on NB-IoT technology, characterized in that: the terminal module comprises an XY1100 chip (1) with an MCU and an NB-IoT radio frequency chip integrated therein, a radio frequency switch chip (5), a second-order LC impedance matching circuit (2), a second-order Gaussian low-pass filter (3), a second-order Bessel band-pass filter (4), a pi-type impedance matching circuit (6), a crystal oscillator matching circuit (7) and a power supply filtering circuit (8);
the radio frequency switch chip (5) can switch and connect a part of circuits of the radio frequency common path to independent branches required by different working states of the module according to different working states of the module, so that the stability and reliability of the working path of the module in different modes are ensured;
the second-order LC impedance matching circuit (2) is responsible for impedance matching of an XY1100 radio frequency output pin to 50 ohms;
the second-order Gaussian low-pass filter (3) is responsible for filtering radio-frequency signals, ensuring that low frequency passes and inhibiting partial high-frequency harmonic;
the second-order Bessel-type band-pass filter (4) further inhibits high-frequency harmonics of signals output by the Gaussian filter under the condition of ensuring the frequency output passband, and achieves the purpose that higher harmonics meet the requirements of related industry indexes;
the pi-type impedance matching circuit (6) is responsible for adjusting the link impedance from the input pin of the XY1100 to the radio frequency switch to 50 ohms;
the crystal oscillator matching circuit (7) comprises two specifications, namely 38.4MHz and 32.768KHz, wherein the 38.4MHz crystal oscillator is used for serving an NB-IoT chip integrated in the XY1100 chip (1) and providing frequency multiplication basic frequency for transmitting and receiving work of the XY1100 chip (1), and the 32.768KHz is used for serving a general MCU in the XY1100 chip (1) and providing frequency reference for the work of an MCU timer;
the power supply filter circuit (8) is used for supplying power to the XY1100 chip (1) for filtering, so that lower ripples of power supply input are ensured, and the receiving state sensitivity of the power supply filter circuit is increased.
2. The NB-IoT technology-based terminal module according to claim 1, wherein: an output pin of the XY1100 chip (1) is connected with a second-order LC impedance matching circuit (2), the second-order LC impedance matching circuit (2) is connected with a second-order Gaussian low-pass filter (3), the second-order Gaussian low-pass filter (3) is connected with a second-order Bessel-type band-pass filter (4), and the second-order Bessel-type band-pass filter (4) is connected with an input pin at one end of a radio frequency switch chip (5) to form a sending radio frequency link; the other input pin of the radio frequency switch chip (5) is connected with a pi-type impedance matching circuit (6), and the pi-type impedance matching circuit (6) is connected with the input pin of the XY1100 chip (1) to form a receiving radio frequency link; the crystal oscillator matching circuit (7) is connected with the XY1100 chip (1); the power supply filter circuit (8) is connected with XY 1100.
3. The NB-IoT technology-based terminal module according to claim 2, wherein: the power supply and control pins of the radio frequency switch are connected into the XY1100 chip (1), the XY1100 chip (1) supplies power to the radio frequency switch, and the XY1100 chip (1) controls a circuit gating path of the radio frequency switch, so that the expected function of the module is achieved.
4. The NB-IoT technology-based terminal module according to claim 1, wherein: the terminal module is designed by adopting a welding type metal shielding case, and the module sequence code SN and the network access permission number IMEI are printed on the metal shielding case by laser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020534645.4U CN211509042U (en) | 2020-04-13 | 2020-04-13 | Terminal module based on NB-IoT technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020534645.4U CN211509042U (en) | 2020-04-13 | 2020-04-13 | Terminal module based on NB-IoT technology |
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| CN211509042U true CN211509042U (en) | 2020-09-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020534645.4U Active CN211509042U (en) | 2020-04-13 | 2020-04-13 | Terminal module based on NB-IoT technology |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114696862A (en) * | 2021-09-22 | 2022-07-01 | 浙江利尔达物联网技术有限公司 | TDD's Cat.1bis circuit and circuit module |
| CN115149973A (en) * | 2021-11-09 | 2022-10-04 | 浙江利尔达物联网技术有限公司 | NB-Iot module |
-
2020
- 2020-04-13 CN CN202020534645.4U patent/CN211509042U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114696862A (en) * | 2021-09-22 | 2022-07-01 | 浙江利尔达物联网技术有限公司 | TDD's Cat.1bis circuit and circuit module |
| CN114696862B (en) * | 2021-09-22 | 2023-12-19 | 浙江利尔达物联网技术有限公司 | TDD Cat.1bis circuit and circuit module |
| CN115149973A (en) * | 2021-11-09 | 2022-10-04 | 浙江利尔达物联网技术有限公司 | NB-Iot module |
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