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CN-122017349-A - Impedance detection circuit and electronic device

CN122017349ACN 122017349 ACN122017349 ACN 122017349ACN-122017349-A

Abstract

The application discloses an impedance detection circuit and electronic equipment, wherein the impedance detection circuit comprises a transmission line, at least three voltage coupling detection probes, a voltage sampling circuit and a processing unit, wherein the transmission line comprises an antenna end and a radio frequency source end, the three voltage coupling detection probes are sequentially arranged along the extending direction of the transmission line and are used for coupling and collecting radio frequency signals transmitted by the transmission line, the voltage sampling circuit is connected with the voltage coupling detection probes and is used for obtaining the radio frequency signals collected by the voltage coupling detection probes and converting the radio frequency signals into corresponding direct current voltage information, and the processing unit is connected with the voltage sampling circuit and is used for receiving the direct current voltage information and determining the complex impedance of the transmission line according to the direct current voltage information.

Inventors

  • WANG YAO

Assignees

  • 艾酷软件技术(上海)有限公司

Dates

Publication Date
20260512
Application Date
20260309

Claims (14)

  1. 1. An impedance detection circuit, comprising: a transmission line comprising an antenna end and a radio frequency source end; The at least three voltage coupling detection probes are sequentially arranged along the extending direction of the transmission line and are used for coupling and collecting radio frequency signals transmitted by the transmission line; The voltage sampling circuit is connected with the voltage coupling detection probe and is used for acquiring the radio frequency signals acquired by the voltage coupling detection probe and converting the radio frequency signals into corresponding direct current voltage information; And the processing unit is connected with the voltage sampling circuit and is used for receiving the direct-current voltage information and determining the complex impedance of the transmission line according to the direct-current voltage information.
  2. 2. The impedance detection circuit of claim 1, wherein the length direction of the voltage coupling detection probe is disposed parallel to the extension direction of the transmission line.
  3. 3. The impedance detection circuit of claim 1 wherein the voltage coupling detection probe has a gap with the transmission line to form a coupling capacitance.
  4. 4. The impedance detection circuit of claim 1, wherein the radio frequency signal transmitted by the transmission line comprises at least one of a first frequency band signal, a second frequency band signal, and a third frequency band signal, the first frequency band signal having a frequency less than the frequency of the second frequency band signal, the second frequency band signal having a frequency less than the frequency of the third frequency band signal; in the case that the radio frequency signal includes the first frequency band signal, the voltage coupling detection probe includes a first probe, the width of the first probe is less than or equal to 0.4mm, and the length of the first probe is less than or equal to 1.3mm; in the case that the radio frequency signal includes the second frequency band signal, the voltage coupling detection probe includes a second probe, the width of the second probe is less than or equal to 0.4mm, and the length of the second probe is less than or equal to 1.0mm; And under the condition that the radio frequency signal comprises the third frequency band signal, the voltage coupling detection probe comprises a third probe, the width of the third probe is smaller than or equal to 0.4mm, and the length of the third probe is smaller than or equal to 0.7mm.
  5. 5. The impedance detection circuit of claim 4, further comprising: A switching circuit; The width and length of the first probe are matched with the first frequency band signal, the width and length of the second probe are matched with the second frequency band signal, and the width and length of the third probe are matched with the third frequency band signal; the voltage sampling circuit is connected with the first probe through the switch circuit under the condition that the radio frequency signal transmitted by the transmission line is the first frequency band signal; the voltage sampling circuit is connected with the second probe through the switch circuit under the condition that the radio frequency signal transmitted by the transmission line is the second frequency band signal; And under the condition that the radio frequency signal transmitted by the transmission line is the third frequency band signal, the voltage sampling circuit is connected with the third probe through the switch circuit.
  6. 6. The impedance detection circuit of any one of claims 1 to 5 wherein the distance between the voltage coupling detection probe and the transmission line is greater than the linewidth of the transmission line.
  7. 7. The impedance detection circuit of any one of claims 1 to 5, wherein a distance between two adjacent voltage-coupled detection probes is less than or equal to λ/20, where λ is a wavelength of a radio frequency signal transmitted by the transmission line.
  8. 8. The impedance detection circuit according to any one of claims 1 to 5, wherein, At least three of the voltage coupling detection probes are positioned on the same side of the transmission line, or at least three of the voltage coupling detection probes are respectively positioned on two opposite sides of the transmission line.
  9. 9. The impedance detection circuit according to any one of claims 1 to 5, further comprising: the test seat and the matching circuit are characterized in that the transmission line comprises a first transmission line, a second transmission line and a third transmission line, one end of the first transmission line comprises the antenna end, and one end of the third transmission line comprises the radio frequency source end; The other end of the first transmission line is connected with the test seat, the two ends of the second transmission line are respectively connected with the test seat and the matching circuit, and the other end of the third transmission line is connected with the matching circuit; At least one voltage coupling detection probe is arranged opposite to the first transmission line, at least one voltage coupling detection probe is arranged opposite to the second transmission line, and at least one voltage coupling detection probe is arranged opposite to the third transmission line; The matching circuit is connected with the processing unit, the processing unit determines a matching parameter according to the complex impedance and transmits the matching parameter to the matching circuit, and the matching circuit is used for adjusting the impedance of the matching circuit according to the matching parameter.
  10. 10. The impedance detection circuit according to any one of claims 1 to 5, wherein the voltage sampling circuit comprises: the voltage conversion module is connected with the voltage coupling detection probe and used for converting the radio frequency signal into a direct current voltage signal; and the voltage detection module is connected with the voltage conversion module and is used for converting the direct-current voltage signal into the direct-current voltage information.
  11. 11. The impedance detection circuit of claim 10 wherein the voltage conversion module comprises a radio frequency schottky diode, the voltage coupling detection probe being connected to the radio frequency schottky diode.
  12. 12. The impedance detection circuit according to any one of claims 1 to 5, wherein the voltage coupling detection probe and the transmission line are provided on a substrate, the substrate being provided with a plurality of ground holes, the plurality of ground holes being provided around at least part of the circumference of the voltage coupling detection probe.
  13. 13. An electronic device, comprising: an impedance detection circuit as claimed in any one of claims 1 to 12.
  14. 14. The electronic device of claim 13, further comprising: The power management integrated module comprises an analog-to-digital converter; the voltage sampling circuit of the impedance detection circuit comprises a voltage detection module, and the voltage detection module is the analog-to-digital converter.

Description

Impedance detection circuit and electronic device Technical Field The application belongs to the technical field of electronic equipment, and particularly relates to an impedance detection circuit and electronic equipment. Background At present, the mismatch between the radio frequency and the antenna refers to the mismatch between a transmission system of the radio frequency signal and the antenna, and the mismatch problem can cause the consequences of reduced communication performance, failure of a power amplifier and the like. In the related art, some mismatch detection methods are obtained by calculating antenna efficiency, and in the whole test process, an Over-the-Air (OTA) index, antenna efficiency and the like need to be tested, so that the time is long, and the consistency requirements on a radio frequency conduction test instrument and an antenna test instrument are high. And after the electronic equipment is shipped, the mismatch condition can not be monitored, the subsequent mismatch phenomenon can only test the after-sales analysis reason, and if large-scale mismatch occurs, the mismatch amount can not be determined to take measures. In addition, the existing scheme of integrated detection by adopting devices such as a directional coupler and a circulator can only acquire single-point power scalar information and can not accurately reflect the impedance state of a transmission line, so that follow-up tuning is dependent on inefficient exhaustive traversal, and tuning difficulty is increased. Disclosure of Invention The application aims to provide an impedance detection circuit and electronic equipment, which at least solve the problems that impedance detection is difficult and tuning difficulty is increased in the related technology. In order to solve the technical problems, the application is realized as follows: In a first aspect, an embodiment of the application provides an impedance detection circuit, which comprises a transmission line, at least three voltage coupling detection probes, a voltage sampling circuit and a processing unit, wherein the transmission line comprises an antenna end and a radio frequency source end, the three voltage coupling detection probes are sequentially arranged along the extending direction of the transmission line and are used for coupling and collecting radio frequency signals transmitted by the transmission line, the voltage sampling circuit is connected with the voltage coupling detection probes and is used for obtaining the radio frequency signals collected by the voltage coupling detection probes and converting the radio frequency signals into corresponding direct current voltage information, and the processing unit is connected with the voltage sampling circuit and is used for receiving the direct current voltage information and determining complex impedance of the transmission line according to the direct current voltage information. In a second aspect, an embodiment of the application proposes an electronic device comprising an impedance detection circuit as set forth in any one of the first aspects. In the embodiment of the application, the impedance detection circuit comprises a transmission line, at least three voltage coupling detection probes, a voltage sampling circuit and a processing unit, wherein the transmission line comprises an antenna end and a radio frequency source end and is used for carrying radio frequency signal transmission, the at least three voltage coupling detection probes are arranged at different positions of the transmission line along the extending direction of the transmission line in a non-contact mode, the voltage coupling detection probes collect radio frequency signals transmitted by the transmission line, the voltage sampling circuit is electrically connected with all the voltage coupling detection probes to obtain radio frequency signals collected by each voltage coupling detection probe and convert the radio frequency signals into corresponding direct current voltage information, and the processing unit is connected with the voltage sampling circuit to receive the direct current voltage information output by the voltage sampling circuit and can effectively and accurately detect complex impedance values on the transmission line according to the direct current voltage information of a plurality of positions. In the embodiment provided by the application, reliable detection of complex impedance is realized by arranging the voltage coupling detection probe, the cost is reduced, the response time is faster, the detection accuracy is higher, and the influence on a transmission line is smaller. Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application. Drawings The foregoing and/or additional aspects and advantages of the application will become apparent and may be better