CN213072711U

CN213072711U - Modulation circuit for transmitting data to gateway by Internet of things terminal

Info

Publication number: CN213072711U
Application number: CN202021848229.8U
Authority: CN
Inventors: 鲁力; 李松璠; 张翀; 宋一杭; 郑辉; 刘璐
Original assignee: University of Electronic Science and Technology of China
Current assignee: Chengdu Chenxin Iot Technology Co ltd
Priority date: 2020-08-28
Filing date: 2020-08-28
Publication date: 2021-04-27
Anticipated expiration: 2030-08-28

Abstract

The utility model discloses a modulation circuit of thing networking terminal to gateway sending data belongs to the signal modulation field in the thing networking terminal. The utility model discloses an envelope detection circuit, the clock acquisition circuit, a sensor, exclusive-or gate and reflection circuit, wherein, envelope detection circuit's input is used for being connected with the antenna receiving terminal at thing networking terminal, the input of clock acquisition circuit is connected to the output, the clock signal input of sensor is connected to the output of clock acquisition circuit, the data signal output of sensor is connected to an input of exclusive-or gate, another input is used for inserting the subcarrier, the antenna transmission end at thing networking terminal is connected through reflection circuit to the output of exclusive-or gate. Through the above technical scheme of the utility model, can regard as the carrier wave with the radio signal who contains the clock to the defeated data modulation of sensor is on the carrier wave, with two way signal transmission to gateways of clock and data simultaneously, is applicable to no thing networking terminal of treater.

Description

Modulation circuit for transmitting data to gateway by Internet of things terminal

Technical Field

The utility model relates to a signal modulation field especially relates to a modulation circuit that thing networking terminal sent data to gateway in the thing networking terminal.

Background

At present, a sensor chip in a physical network terminal can only output standard computer bus signals, when the bus signals are subjected to backscattering, because the bus signals are two paths of signals containing clocks and data, the traditional backscattering reflects one path of baseband signals, that is, the backscattering of one path of signals needs to transmit two paths of bus signals, and if a processor in the internet of things terminal is removed, how to simultaneously transmit two paths of signals in the standard computer bus signals to a gateway becomes a difficult problem to overcome.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a thing networking terminal is to gateway transmission data's modulation circuit, can be simultaneously with clock and data in the bus of sensor output together through backscatter transmission to gateway.

The utility model provides a its technical problem, the technical scheme of adoption is: the modulation circuit for transmitting data to the gateway by the Internet of things terminal comprises an envelope detection circuit, a clock acquisition circuit, a sensor, an exclusive-or gate and a reflection circuit, wherein the input end of the envelope detection circuit is used for being connected with the antenna receiving end of the Internet of things terminal, the output end of the envelope detection circuit is connected with the input end of the clock acquisition circuit, the output end of the clock acquisition circuit is connected with the clock signal input end of the sensor, one input end of the exclusive-or gate is connected with the data signal output end of the sensor, the other input end of the exclusive-or gate is used for accessing a subcarrier, and the output end of the exclusive.

Further, the clock acquisition circuit is an inverter.

Further, the subcarrier is generated by a subcarrier generator.

Further, the reflection circuit comprises a PMOS tube and a ground wire, the grid electrode of the PMOS tube is connected with the output end of the exclusive-OR gate, the source electrode of the PMOS tube is connected with the ground wire, and the drain electrode of the PMOS tube is connected with the antenna transmitting end of the terminal of the Internet of things.

The utility model has the advantages that the modulation circuit for sending data to the gateway through the terminal of the internet of things can extract the pulse width coding envelope signal from the wireless signal received by the terminal of the internet of things through the envelope detection circuit, the high amplitude part in the wireless signal is extracted as high level, the low amplitude part in the wireless signal is extracted as low level, the pulse width coding envelope signal is converted into a clock after being reversed through the clock acquisition circuit, the clock drives the sensor, the sensor outputs bus data under the drive of the clock and carries out XOR with the subcarrier under the action of the XOR gate to realize frequency shift, i.e., modulation, the frequency of its output signal is the sum of the bus data frequency and the subcarrier frequency, and, finally, the signal is modulated on the wireless signal through the reflection circuit and is sent to the gateway, and then the return of the wireless signal containing the clock and the bus data is realized.

Drawings

Fig. 1 is a schematic diagram of an overall structure of a modulation circuit for transmitting data to a gateway by an internet of things terminal according to an embodiment of the present invention;

the system comprises a phase inverter, an antenna receiving end, an antenna transmitting end, an XOR gate, a PMOS tube, a GND ground wire, and a PIE, wherein A represents the phase inverter, RX represents the antenna receiving end of the Internet of things terminal, TX represents the antenna transmitting end of the Internet of things terminal, XOR represents the XOR gate, Q represents the PMOS tube, GND represents the ground wire, and PIE is called Pulse interval encoding for all and represents Pulse width encoding.

Detailed Description

The technical solution of the present invention will be described in detail with reference to the accompanying drawings and embodiments.

Examples

The utility model provides a modulation circuit of thing networking terminal to gateway sending data, including envelope detection circuit, the clock acquisition circuit, a sensor, exclusive-or gate and reflection circuit, wherein, envelope detection circuit's input is used for being connected with the antenna receiving terminal at thing networking terminal, the input of clock acquisition circuit is connected to the output, the clock signal input of sensor is connected to the output of clock acquisition circuit, the data signal output part of sensor is connected to an input of exclusive-or gate, another input is used for inserting the subcarrier, the antenna transmitting terminal at thing networking terminal is connected through reflection circuit to the output of exclusive-or gate.

In the circuit, in order to acquire the clock in the PIE envelope signal and save the cost of the clock acquisition circuit, the clock acquisition circuit is preferably an inverter a; in a general application process, subcarriers are generated by a subcarrier generator; in order to send out the modulated signal, the reflection circuit may include a PMOS transistor and a ground GND, wherein a gate of the PMOS transistor is connected to an output terminal of the xor gate, a source of the PMOS transistor is connected to the ground GND, and a drain of the PMOS transistor is connected to an antenna transmitting terminal of the internet of things terminal.

The general structure of the circuit is schematically shown in fig. 1, wherein:

firstly, receiving a wireless signal through an antenna receiving end RX of an Internet of things terminal, and extracting a PIE envelope signal from the wireless signal through an envelope detection circuit, wherein the wireless signal specifically comprises a high-amplitude part and a low-amplitude part, the high-amplitude part is extracted as a high level, and the low-amplitude part is extracted as a low level.

Secondly, the extracted PIE envelope signal is converted into a bus clock signal after being inverted through an inverter A, the sensor is driven through the bus clock signal, the sensor outputs standard computer bus data under the driving of a clock, the output bus data passes through an XOR gate, and is subjected to XOR with a subcarrier under the action of the XOR gate to realize frequency shift, namely modulation is realized, wherein the frequency of the XOR gate output signal is the sum of the frequency of the bus data and the subcarrier frequency, and the subcarrier is used for providing a signal required by frequency shift.

And finally, inputting the modulated modulation signal into a reflection circuit, namely a PMOS (P-channel metal oxide semiconductor) tube Q, wherein when the modulation signal is at a low level, the PMOS tube Q is cut off, at the moment, no signal can pass through the PMOS tube Q, when the modulation signal is at a high level, the PMOS tube Q is switched on, and at the moment, the modulation signal is sent to a gateway through an antenna transmitting end of the Internet of things terminal, so that the return of the wireless signal containing the clock and bus data is realized.

Claims

1. The modulation circuit for transmitting data to the gateway by the Internet of things terminal is characterized by comprising an envelope detection circuit, a clock acquisition circuit, a sensor, an exclusive-or gate and a reflection circuit, wherein the input end of the envelope detection circuit is used for being connected with the antenna receiving end of the Internet of things terminal, the output end of the envelope detection circuit is connected with the input end of the clock acquisition circuit, the output end of the clock acquisition circuit is connected with the clock signal input end of the sensor, one input end of the exclusive-or gate is connected with the data signal output end of the sensor, the other input end of the exclusive-or gate is used for accessing a subcarrier, and the output end of the exclusive-or gate.

2. The modulation circuit for transmitting data to the gateway through the terminal of the internet of things according to claim 1, wherein the clock acquisition circuit is an inverter.

3. The internet of things terminal data modulation circuit of claim 1, wherein the subcarrier is generated by a subcarrier generator.

4. The modulation circuit for transmitting data to the gateway by the terminal of the internet of things according to any one of claims 1 to 3, wherein the reflection circuit comprises a PMOS tube and a ground wire, the grid electrode of the PMOS tube is connected with the output end of the XOR gate, the source electrode of the PMOS tube is connected with the ground wire, and the drain electrode of the PMOS tube is connected with the antenna transmitting end of the terminal of the internet of things.