CN213693714U

CN213693714U - Radio frequency signal detection circuit

Info

Publication number: CN213693714U
Application number: CN202023280934.5U
Authority: CN
Inventors: 赵亚冬; 李夏琴
Original assignee: Chengdu Ningjinwei Communication Technology Co ltd
Current assignee: Chengdu Ningjinwei Communication Technology Co ltd
Priority date: 2020-12-29
Filing date: 2020-12-29
Publication date: 2021-07-13
Anticipated expiration: 2030-12-29

Abstract

The utility model discloses a radio frequency signal detection circuit, which comprises an RMS-DC converter, wherein the RMS-DC converter is used for detecting the radio frequency signal of a signal source and transmitting the radio frequency signal to an ADC chip, and the ADC chip is used for collecting the voltage of the radio frequency signal; the ADC chip is connected with the MCU, the acquired voltage data are transmitted to the MCU, and the MCU processes the voltage data transmitted by the ADC chip and then transmits the processed voltage data to the display equipment for visual display; compared with the prior art, the monitoring result is displayed through the computer, so that people can know the working state of the equipment more, the equipment can be used better, meanwhile, the amplifier and other accessory equipment are protected from overload work for a long time, the design of the radio frequency signal level monitoring circuit based on the single chip microcomputer is realized, and more convenience is provided for production and life of people.

Description

Radio frequency signal detection circuit

Technical Field

The utility model belongs to radio frequency signal detection area specifically is a radio frequency signal detection circuitry.

Background

With the development of modern science and technology, the application of radio frequency signals is deep into all aspects of our production and life, and the monitoring of radio frequency signals is a very important link, for example, in the development process of a magnetic levitation train, the radio frequency signals are monitored accurately; the method has great significance for monitoring the radio frequency signal level in measurement, and accurate monitoring of the radio frequency signal level can enable people to know the current working state of the equipment better, so that the equipment can be used better. In the aspect of control, monitoring of the level of the radio frequency signal is also significant, and monitoring of the power level of the radio frequency signal is very significant in power control, particularly in the role of protecting an amplifier and other accessory equipment from long-time overload work; the link of monitoring the radio frequency signals is important for better applying the radio frequency signals to daily life and work; more understanding and research on the monitoring of the radio frequency signal are needed, so that the radio frequency signal can be better mastered, and more convenience is provided for work and life of people.

SUMMERY OF THE UTILITY MODEL

To the weak point that exists among the above-mentioned technique, the utility model provides a radio frequency signal detection circuitry utilizes singlechip, AD chip, radio frequency detection chip and RS232 interface chip, designs radio frequency signal level monitoring module, recycles computer serial ports programming and singlechip programming, through computer display monitoring result to can directly solve the operating condition of equipment, so that use equipment better, protect amplifier and other accessory equipment not overload work for a long time simultaneously.

In order to achieve the above object, the present invention provides a radio frequency signal level monitoring circuit, which includes an RMS-DC converter, wherein the RMS-DC converter is used to detect a radio frequency signal of a signal source and transmit the radio frequency signal to an ADC chip, and the ADC chip is used to collect a voltage of the radio frequency signal; the ADC chip is connected with the MCU, the acquired voltage data are transmitted to the MCU, and the MCU processes the voltage data transmitted by the ADC chip and then transmits the processed voltage data to the display equipment for visual display.

In a specific scheme, the RMS-DC converter comprises an AD8363 chip, the AD8363 chip comprises a radio-frequency signal input end and a radio-frequency signal output end, the radio-frequency signal input end is used for being connected with an external signal source, and the radio-frequency signal output end is used for being connected with the ADC chip.

According to the specific scheme, the AD8363 chip further comprises a loop filter integrating capacitor connecting end, and the loop filter integrating capacitor connecting end is connected with the ground through a capacitor and a resistor which are connected in series.

In a specific scheme, the AD8363 chip further comprises a voltage input end, and the power measurement port is connected with the radio-frequency signal output end through a current-limiting resistor.

According to the specific scheme, the AD8363 chip further comprises a dormancy control end, the dormancy control end is used for being connected with an external power supply, and when the external power supply inputs a high level, the AD8363 chip is controlled to enter dormancy.

In a specific scheme, the ADC chip is a successive approximation register analog-to-digital converter chip.

In a specific scheme, the MCU is connected with the display equipment through an IO port through an SP3232E chip; the SP3232E chip is used for converting the TTL level of the single chip microcomputer into the RS232 level of the universal serial port level.

The utility model has the advantages that: the utility model provides a radio frequency signal detection circuitry, including the RMS-DC converter, the RMS-DC converter is used for detecting the radio frequency signal of signal source to transmit radio frequency signal to the ADC chip, the ADC chip is used for gathering the voltage of radio frequency signal; the ADC chip is connected with the MCU, the acquired voltage data are transmitted to the MCU, and the MCU processes the voltage data transmitted by the ADC chip and then transmits the processed voltage data to the display equipment for visual display; compared with the prior art, the monitoring result is displayed through the computer, so that people can know the working state of the equipment more, the equipment can be used better, meanwhile, the amplifier and other accessory equipment are protected from overload work for a long time, the design of the radio frequency signal level monitoring circuit based on the single chip microcomputer is realized, and more convenience is provided for production and life of people.

Drawings

FIG. 1 is a block diagram of the structure relationship of the present invention;

fig. 2 is an internal circuit diagram of the AD8363 chip of the present invention;

fig. 3 is a circuit diagram of the AD8363 chip detector of the present invention.

The main element symbols are as follows:

1. a signal source; 2. an RMS-DC converter; 3. an ADC chip; 4. a display device;

Detailed Description

In order to make the present invention clearer, the present invention will be further described with reference to the accompanying drawings.

As described in the background art, the monitoring of rf signals is crucial to better application of rf signals to our daily life and work; based on this, the utility model provides a radio frequency signal detection circuit, please refer to fig. 1, which includes an RMS-DC converter 2, the RMS-DC converter 2 is used for detecting the radio frequency signal of the signal source 1 and transmitting the radio frequency signal to an ADC chip 3, the ADC chip 3 is used for collecting the voltage of the radio frequency signal; ADC chip 3 is connected with MCU to voltage data transmission to MCU with gathering, MCU sends display device 4 after handling the voltage data of ADC chip 3 transmission and carries out visual display.

Compared with the prior art, the monitoring result is displayed through the computer, so that people can know the working state of the equipment more, the equipment can be used better, meanwhile, the amplifier and other accessory equipment are protected from overload work for a long time, the design of the radio frequency signal level monitoring circuit based on the single chip microcomputer is realized, and more convenience is provided for production and life of people.

In this embodiment, the MCU performs data processing by using a 32-bit single chip microcomputer, the ADC sampling precision is not less than 8bit, and the RMD-DC converter is used to detect the rf signal; the design of a system is completed mainly by utilizing the Altium Designer software, and the design and manufacture of a hardware part are completed by utilizing a minimum system module of a single chip microcomputer; the software design mainly comprises four parts of a clock timer design, a data receiver design, a UART transmitting module design and a data display module. The compiling of a clock timer and a data receiving algorithm processing part is realized by Keil software, the processing of detection data is realized by using an MCU, and the visualization of the processed data is realized by using a UART transmitting module design and a data display module.

In this embodiment, the RMS-DC conversion detector circuit is well suited for power detection of signals with varying crest factors, such as CDMA and WCDMA signals.

In this embodiment, the RMS-DC converter 2 includes an AD8363 chip, the AD8363 chip includes a radio frequency signal input terminal and a radio frequency signal output terminal, the radio frequency signal input terminals INLO and INHI are used for connecting with the external signal source 1, and the radio frequency signal output terminal VOUT is used for connecting with the ADC chip 3; the AD8363 chip also comprises a loop filter integrating capacitor connecting end CLPF, and the loop filter integrating capacitor connecting end CLPF is connected with the ground through a capacitor and a resistor which are connected in series; the capacitor is used for reducing high-pass angular frequency generated by an offset zero calibration loop inside the chip.

Referring to fig. 1, the AD8363 chip includes the following ports: COMM: common ground, CLPF: loop filter integrating capacitor connecting end, CHPF: the input end of the high-pass filter, the size of the capacitance between the pin and the ground determines the 3dB frequency of the input high-pass filter; INHI: the "+" terminal of the signal differential input port, INLO: the "-" end of the signal differential input port, DECL: the decoupling terminals of "INHI" and "INLO" should be connected to ground through a large capacitor to form the complete input circuit, VOUT: an error amplifier voltage output, typically connected directly to the "VSET" terminal in a measurement mode; VREF: the 1.25V universal reference voltage output can be directly provided to the sleep control end of the VTGT and TCM1, and the device is turned off when the voltage is high.

Referring to fig. 3, the AD8363 chip further includes a voltage input terminal, and the power measurement port is connected to the rf signal output terminal through a current-limiting resistor; at this point, the output is proportional to the logarithm of the input root mean square value; the readings are expressed directly in decibels;

according to the specific scheme, the AD8363 chip further comprises a dormancy control end, the dormancy control end is used for being connected with an external power supply, and when the external power supply inputs a high level, the AD8363 chip is controlled to enter dormancy; the power consumption of the AD8363 chip is 1.5mW when the AD chip is in the sleep state.

In a specific scheme, the ADC chip 3 is a successive approximation register analog-to-digital converter chip; since the ADC module employs a Successive Approximation Register (SAR) analog-to-digital converter (ADC), to implement a binary search algorithm, the N-bit register is first set at the middle scale (i.e., 100.. 00, MSB set to 1). Thus, the DAC output (VDAC) is set to VREF/2, which is the reference voltage provided to the ADC. The comparison then determines whether VIN is less than or greater than VDAC. If VIN is greater than VDAC, the comparator outputs a logic high level or 1 and the MSB of the N-bit register remains at 1. Conversely, if VIN is less than VDAC, the comparator outputs a logic low, MSB of the N-bit register clear 0. The SAR control logic then moves to the next bit and sets that bit high for the next comparison. This process continues until the LSB. After the operation is finished, the conversion is also finished, the N-bit conversion result is stored in the register, and the MCU needs to perform time sequence control and data reading on the SAR ADC to realize 8-bit data sampling.

In this embodiment, the MCU is connected to the display device 4 through the SP3232E chip via the IO port; the SP3232E chip is used for converting the TTL level of the single chip microcomputer into the RS232 level of the universal serial port level.

The utility model has the advantages that:

1. the monitoring result is displayed through the computer, so that people can know the working state of the equipment more, the equipment can be used better, meanwhile, the amplifier and other accessory equipment are protected from overload work for a long time, the design of the radio frequency signal level monitoring circuit based on the single chip microcomputer is realized, and more convenience is provided for production and life of people.

2. The AD8363 chip also comprises a dormancy control end which is used for being connected with an external power supply and controlling the AD8363 chip to enter dormancy when the external power supply inputs a high level; the power consumption of the AD8363 chip is 1.5mW during sleep; and the undetected power consumption is reduced.

The above disclosure is only for the specific embodiments of the present invention, but the present invention is not limited thereto, and any changes that can be made by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. The radio frequency signal detection circuit is characterized by comprising an RMS-DC converter, wherein the RMS-DC converter is used for detecting a radio frequency signal of a signal source and transmitting the radio frequency signal to an ADC chip, and the ADC chip is used for collecting the voltage of the radio frequency signal; the ADC chip is connected with the MCU, the acquired voltage data are transmitted to the MCU, and the MCU processes the voltage data transmitted by the ADC chip and then transmits the processed voltage data to the display equipment for visual display.

2. The RF signal detecting circuit of claim 1, wherein the RMS-DC converter includes an AD8363 chip, the AD8363 chip includes an RF signal input terminal for connecting to an external signal source and an RF signal output terminal for connecting to the ADC chip.

3. The radio frequency signal detection circuit according to claim 2, wherein the AD8363 chip further includes a loop filter integrating capacitor connection terminal, and the loop filter integrating capacitor connection terminal is connected to ground through a capacitor and a resistor connected in series.

4. The RF signal detecting circuit according to claim 3, wherein the AD8363 chip further includes a voltage input terminal, and the power measuring port is connected to the RF signal output terminal through a current limiting resistor.

5. The RF signal detecting circuit according to claim 4, wherein the AD8363 chip further includes a sleep control terminal, the sleep control terminal is used for connecting with an external power supply, and when the external power supply inputs a high level, the AD8363 chip is controlled to enter a sleep mode.

6. The radio frequency signal detection circuit according to claim 1, wherein the ADC chip is a successive approximation register analog-to-digital converter chip.

7. The radio frequency signal detection circuit according to claim 1, wherein the MCU is connected to the display device through the SP3232E chip via the IO port; the SP3232E chip is used for converting the TTL level of the single chip microcomputer into the RS232 level of the universal serial port level.