CN201666916U - Active antenna current detection and short circuit protection circuit of satellite positioning time service receiving machine - Google Patents
Active antenna current detection and short circuit protection circuit of satellite positioning time service receiving machine Download PDFInfo
- Publication number
- CN201666916U CN201666916U CN2010201080621U CN201020108062U CN201666916U CN 201666916 U CN201666916 U CN 201666916U CN 2010201080621 U CN2010201080621 U CN 2010201080621U CN 201020108062 U CN201020108062 U CN 201020108062U CN 201666916 U CN201666916 U CN 201666916U
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- CN
- China
- Prior art keywords
- receiving machine
- module
- active antenna
- time service
- satellite positioning
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model relates to a radio-frequency circuit of a satellite positioning receiving machine and a time service receiving machine, which adopts a structure of a unique and additional first module for completing a secondary frequency conversion. Concretely, an input socket, a signal amplifier, a first frequency mixer, a first intermediate-frequency amplifier, a sound surface filter and a second module are connected in series, the first module is connected with the first frequency mixer and the second module, and the second module is mutually connected with a crystal oscillator and a microcontroller. The utility model has the advantages of simple circuit structure and small size, and is favorable for meeting the miniaturization requirement of the receiving machine.
Description
Technical field
The present invention relates to the satellite navigation application, be specially satnav Timing Receiver active antenna current detecting and short-circuit protection circuit.
Background technology
The satnav Timing Receiver adopts the method for active antenna to increase the signal to noise ratio (S/N ratio) of signal usually.The interface of itself and antenna has feed output.Because the plug of active antenna easily causes overcurrent or short circuit.Corresponding current detecting and short-circuit protection method must be arranged.
Summary of the invention
The invention provides a kind of satnav Timing Receiver active antenna current detecting and short-circuit protection circuit.
This active antenna current detecting and short-circuit protection circuit structure are that current sense resistor 5, operational amplifier 1, serial AD chip 4, FPGA 3, Current limited Control switch 2 are in series.
This holding circuit can play a protective role to the satnav Timing Receiver.
Description of drawings
Fig. 1 is a theory diagram.
Embodiment
Its concrete workflow is as follows: when the antenna stream excess current, current sense resistor 5 produces voltages, and operational amplifier 1 is handled voltage, is converted to serial AD core 4 required voltages; FPGA 3 passes through CLK, DATA, and the CS signal reads the voltage transitions value, thereby obtains the voltage sensor value.
If antenna short circuit, FPGA 3 control output levels change, and Current limited Control switch 2 cuts off 5V output and 5V input, and voltage is output as 0, thereby reaches the purpose of protection.
Claims (1)
1. satnav Timing Receiver active antenna current detecting and short-circuit protection circuit; comprise current sense resistor (5), operational amplifier (1), serial AD chip (4), FPGA (3), Current limited Control switch (2), it is characterized in that: current sense resistor (5), operational amplifier (1), serial AD chip (4), FPGA (3), Current limited Control switch (2) series connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201080621U CN201666916U (en) | 2010-02-03 | 2010-02-03 | Active antenna current detection and short circuit protection circuit of satellite positioning time service receiving machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201080621U CN201666916U (en) | 2010-02-03 | 2010-02-03 | Active antenna current detection and short circuit protection circuit of satellite positioning time service receiving machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201666916U true CN201666916U (en) | 2010-12-08 |
Family
ID=43267875
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201080621U Expired - Fee Related CN201666916U (en) | 2010-02-03 | 2010-02-03 | Active antenna current detection and short circuit protection circuit of satellite positioning time service receiving machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201666916U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112367127A (en) * | 2020-10-26 | 2021-02-12 | 维沃移动通信有限公司 | Antenna detection circuit, electronic device, and antenna control method |
-
2010
- 2010-02-03 CN CN2010201080621U patent/CN201666916U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112367127A (en) * | 2020-10-26 | 2021-02-12 | 维沃移动通信有限公司 | Antenna detection circuit, electronic device, and antenna control method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101208 Termination date: 20150203 |
|
| EXPY | Termination of patent right or utility model |