CN201393204Y - Low-noise amplifier protective circuit and wireless transmit-receive system applying same - Google Patents
Low-noise amplifier protective circuit and wireless transmit-receive system applying same Download PDFInfo
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- CN201393204Y CN201393204Y CN200920301250U CN200920301250U CN201393204Y CN 201393204 Y CN201393204 Y CN 201393204Y CN 200920301250 U CN200920301250 U CN 200920301250U CN 200920301250 U CN200920301250 U CN 200920301250U CN 201393204 Y CN201393204 Y CN 201393204Y
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- amplifier
- radiofrequency signal
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- signal
- switch
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Abstract
The utility model provides a low-noise amplifier protective circuit, which comprises a low-noise amplifier, a power detection device and a calculation amplifying circuit. The low-noise amplifier is used for receiving and enlarging a radio frequency signal, which comprises a magnifier and a switch, the magnifier is used for enlarging the radio frequency signal, the switch and the magnifier are connected in parallel, and used for switching the transmission path of the radio frequency signal. The power detection device is used for converting a radio frequency signal power into a voltage signal. The calculation amplifying circuit is connected between the power detection device and the switch, and used for outputting a driving voltage to control the switch to close or switch out according to the voltage signal so as to protect the magnifier. The utility model also provides a wireless transmit-receive system applying the low-noise amplifier protective circuit. The low-noise amplifier protective circuit and the wireless transmit-receive system applying the circuit input the radio frequency signal power to the low-noise amplifier through the automatic detection, thereby protecting the low-noise amplifier before the saturation.
Description
Technical field
The utility model relates to low noise amplifier, relates in particular to a kind of low noise amplifier protective circuit and uses its wireless transceiver system.
Background technology
Low noise amplifier is the vitals in the receiver rf front-end, is generally positioned at after the antenna circuit.Low noise amplifier in circuit, be mainly used in to antenna induction to weak radio-frequency signal carry out low noise and amplify, to satisfy the amplitude requirement of frequency mixer to input signal.The low noise amplifier that design performance is good can greatly improve communication system receiver sensitivity and communication quality.In actual use, need prevent the low noise amplifier state that reaches capacity, the state in case low noise amplifier will reach capacity just should be protected it.
Micro-wave access global inter communication WiMAX at low noise amplifier with decay path, (WorldwideInteroperability for Microwave Access, WiMAX) in the product, be designed to radiofrequency signal at present and arrive radio frequency integrated circuit (Radio Frequency Integrated Circuit through behind the low noise amplifier, RFIC), at last by fundamental frequency integrated circuit (Baseband Integrated Circuit, BBIC) the described radiofrequency signal power of judgement is controlled low noise amplifier, at this moment, just there is saturated risk in low noise amplifier, even can influence the normal operation of radio frequency integrated circuit.So, how can before low noise amplifier is saturated, it be carried out saturated protection, be a difficult problem of being badly in need of solution.
The utility model content
In view of this, be necessary to provide a kind of low noise amplifier protective circuit, can before low noise amplifier is saturated, protect automatically it.
Simultaneously, also need provide a kind of wireless transceiver system of using described low noise amplifier protective circuit, can before low noise amplifier is saturated, protect automatically it.
The low noise amplifier protective circuit that the utility model provides comprises low noise amplifier, power detector and operational amplification circuit.Low noise amplifier is used for receiving and amplifying radiofrequency signal, and described low noise amplifier comprises amplifier and switch.Amplifier is used to amplify described radiofrequency signal.Switch is in parallel with described amplifier; be used to switch the transmission path of described radiofrequency signal; wherein closure does not disconnect so that described amplifier operate as normal when the power of described radiofrequency signal reaches the saturated input power of described amplifier protecting described amplifier when the power of described radiofrequency signal reaches the saturated input power of described amplifier.Power detector is used to detect the power of described radiofrequency signal, and is voltage signal with described radiofrequency signal power transfer.Operational amplification circuit is connected between described power detector and the described switch; be used for controlling described switch closure or disconnection according to described voltage signal outputting drive voltage; wherein when the power of described radiofrequency signal reached the saturated input power of described amplifier, described operational amplification circuit outputting drive voltage was controlled described switch closure and is protected described amplifier.
The wireless transceiver system of the described low noise amplifier protective circuit of the application that the utility model provides comprises radio frequency integrated circuit, antenna, signal transmitting unit, signal receiving unit and single-pole double-throw switch (SPDT).Radio frequency integrated circuit is used to control the transmitting-receiving of radiofrequency signal.Antenna is used to receive and dispatch radiofrequency signal.The signal that signal receiving unit is used for that described antenna is received is sent to described radio frequency integrated circuit.The radiofrequency signal that signal transmitting unit is used for that described radio frequency integrated circuit is sent is sent to described antenna.Described signal receiving unit comprises first filter, low noise amplifier, power detector and operational amplification circuit.First filter is connected in radio frequency integrated circuit.Low noise amplifier is connected in described first filter, is used for receiving and amplifying radiofrequency signal, and described low noise amplifier comprises amplifier and switch.Amplifier is used to amplify described radiofrequency signal.Switch is in parallel with described amplifier; be used to switch the transmission path of described radiofrequency signal; wherein closure does not disconnect so that described amplifier operate as normal when the power of described radiofrequency signal reaches the saturated input power of described amplifier protecting described amplifier when the power of described radiofrequency signal reaches the saturated input power of described amplifier.Power detector is used to detect the power of described radiofrequency signal, and is voltage signal with described radiofrequency signal power transfer.Operational amplification circuit is connected between described power detector and the described switch; be used for controlling described switch closure or disconnection according to described voltage signal outputting drive voltage; wherein when the power of described radiofrequency signal reached the saturated input power of described amplifier, described operational amplification circuit outputting drive voltage was controlled described switch closure and is protected described amplifier.The common port of single-pole double-throw switch (SPDT) is connected in described antenna, and first throws the position is connected in described signal receiving unit, and second throws the position is connected in described signal transmitting unit, is used for selecting connection described common port and first to throw position or second and throws the position.
The radiofrequency signal power that low noise amplifier protective circuit provided by the utility model and the wireless transceiver system of using it input to low noise amplifier by Auto-Sensing is implemented in low noise amplifier and it is protected before saturated, and then the protection radio frequency integrated circuit.
Description of drawings
Fig. 1 is the circuit diagram of the utility model wireless transceiver system one execution mode.
Embodiment
Fig. 1 is the circuit diagram of the utility model wireless transceiver system 10 1 execution modes.
In the present embodiment, wireless transceiver system 10 comprises radio frequency integrated circuit 12, antenna 14, single-pole double-throw switch (SPDT) 16, signal receiving unit 18 and signal transmitting unit 20.
Radio frequency integrated circuit 12 is used to control the transmitting-receiving of radiofrequency signal.
The common port of single-pole double-throw switch (SPDT) 16 is connected in antenna 14, it first is thrown the position and is connected in signal receiving unit 18, second throws the position is connected in signal transmitting unit 20, be used for selecting connection described common port and first to throw position or second and throw the position, promptly select to connect antenna 14 and signal receiving unit 18 or signal transmitting unit 20.
The input of amplifier A1 is connected in described antenna 14 by single-pole double-throw switch (SPDT) 16, and its output is connected in first filter 180, is used to amplify the radiofrequency signal that antenna 14 receives.Amplifier A1 has the parameter of a saturated input power, when the signal power of importing it surpasses this saturated input power, amplifier A1 just damages easily, even has influence on radio frequency integrated circuit 12, surpasses this saturated input power so need prevent the signal power of input amplifier A1.
Switch S 1 is in parallel with amplifier A1; be used to switch the path of low noise amplifier 184 transmitting radio frequency signals; closure is with guard amplifier A1 when the power of radiofrequency signal reaches the saturated input power of amplifier A1, and disconnects so that amplifier A1 operate as normal when the power of radiofrequency signal does not reach the saturated input power of amplifier A1.In the present embodiment; low noise amplifier 184 has a predetermined voltage parameter; when the driving voltage on being added in switch S 1 surpasses this predetermined voltage; switch S 1 will be closure state; at this moment; low noise amplifier 184 can switch to switch S 1 this paths and come transmitting radio frequency signal, makes saturation voltage value significantly promote, thereby protects amplifier A1.Otherwise the driving voltage on being added in switch S 1 is during less than this predetermined voltage, and switch S 1 will be off-state, and at this moment, low noise amplifier 184 can switch back to that this paths of amplifier A1 amplifies and transmitting radio frequency signal, makes amplifier A1 operate as normal.
Particularly; the radiofrequency signal of being imported when antenna 14 increases; make low noise amplifier 184 when saturated; the voltage signal that operational amplification circuit 187 is just exported power detector 186 is converted to the driving voltage that equates with the closed required predetermined voltage of switch S 1; control switch S1 closure, thereby guard amplifier A1.Otherwise the radiofrequency signal of being imported when antenna 14 reduces, and makes low noise amplifier 184 become unsaturation, because gain immobilizes, then the driving voltage exported of operational amplification circuit 187 will be lower than predetermined voltage, thereby makes switch S 1 disconnect, and then makes amplifier A1 operate as normal.In the present embodiment, operational amplification circuit 187 can adopt the noninverting amplifying circuit of operational amplifier, and the see-saw circuit, not gate that also can adopt operational amplifier are in conjunction with composition.
Power amplifier A2 is connected in second filter 200.
The 3rd filter 202 is connected in second of power amplifier A2 and single-pole double-throw switch (SPDT) 16 and throws between the position.In the present embodiment, the 3rd filter 202 is a low pass filter.
Create among the embodiment at this, when wireless transceiver system 10 sent radiofrequency signal, single-pole double-throw switch (SPDT) 16 connected signal transmitting unit 20 and antenna 14.At this moment, radio frequency integrated circuit 12 sends radiofrequency signal earlier to signal transmitting unit 20, then, second filter 200 in the signal transmitting unit 20, power amplifier A2 and the 3rd filter 202 carry out balance filtering, amplification and low-pass filtering treatment to radiofrequency signal respectively, and the radiofrequency signal after the processing is transferred into antenna 14 via single-pole double-throw switch (SPDT) 16.At last, the emission of radio frequency signals after antenna 14 will be handled is gone out.
Low noise amplifier protective circuit 182 that present embodiment provided and the wireless transceiver system 10 of using it are realized the saturated automatic protection functions of low noise amplifiers 184 by power detector 186, operational amplification circuit 187; can prevent effectively that low noise amplifier 184 is in saturation condition, and further protect radio frequency integrated circuit 12.
Claims (10)
1. a low noise amplifier protective circuit is characterized in that, comprising:
Low noise amplifier is used for received RF signal, and described radiofrequency signal is amplified, and described low noise amplifier comprises:
Amplifier is used to amplify described radiofrequency signal; And
Switch, in parallel with described amplifier, be used to switch the transmission path of described radiofrequency signal, wherein closure does not disconnect so that described amplifier operate as normal when the power of described radiofrequency signal reaches the saturated input power of described amplifier protecting described amplifier when the power of described radiofrequency signal reaches the saturated input power of described amplifier;
Power detector is used to detect the power of described radiofrequency signal, and is voltage signal with described radiofrequency signal power transfer; And
Operational amplification circuit; be connected between described power detector and the described switch; be used for controlling described switch closure or disconnection according to described voltage signal outputting drive voltage; wherein when the power of described radiofrequency signal reached the saturated input power of described amplifier, described operational amplification circuit outputting drive voltage was controlled described switch closure and is protected described amplifier.
2. low noise amplifier protective circuit as claimed in claim 1; it is characterized in that; wherein when the power of described radiofrequency signal did not reach the saturated input power of described amplifier, described operational amplification circuit outputting drive voltage was controlled described switch and is kept disconnecting so that described amplifier operate as normal.
3. low noise amplifier protective circuit as claimed in claim 2 is characterized in that, described operational amplification circuit is used for calculating described driving voltage according to the gain of described voltage signal and described operational amplification circuit.
4. low noise amplifier protective circuit as claimed in claim 1 is characterized in that, also comprises directional coupler, is coupled to the input of described amplifier, and the described radiofrequency signal that is used to be coupled is to described power detector.
5. a wireless transceiver system is characterized in that, comprising:
Radio frequency integrated circuit is used to control the transmitting-receiving of radiofrequency signal;
Antenna is used to receive and dispatch radiofrequency signal;
Signal transmitting unit, the radiofrequency signal that is used for that described radio frequency integrated circuit is sent is sent to described antenna;
Signal receiving unit, the radiofrequency signal that is used for that described antenna is received is sent to described radio frequency integrated circuit, and described signal receiving unit comprises:
First filter is connected in described radio frequency integrated circuit, is used for radiofrequency signal is carried out filtering;
Low noise amplifier is connected in described first filter, is used for receiving and amplifying radiofrequency signal, and described low noise amplifier comprises:
Amplifier is used to amplify described radiofrequency signal; And
Switch, in parallel with described amplifier, be used to switch the transmission path of described radiofrequency signal, wherein closure does not disconnect so that described amplifier operate as normal when the power of described radiofrequency signal reaches the saturated input power of described amplifier protecting described amplifier when the power of described radiofrequency signal reaches the saturated input power of described amplifier;
Power detector is used to detect the power of described radiofrequency signal, and is voltage signal with the power transfer of described radiofrequency signal; And
Operational amplification circuit, be connected between described power detector and the described switch, be used for controlling described switch closure or disconnection according to described voltage signal outputting drive voltage, wherein when the power of described radiofrequency signal reached the saturated input power of described amplifier, described operational amplification circuit outputting drive voltage was controlled described switch closure and is protected described amplifier; And
Single-pole double-throw switch (SPDT), its common port is connected in described antenna, and it first is thrown the position and is connected in described signal receiving unit, and it second is thrown the position and is connected in described signal transmitting unit, is used for selecting to connect that described common port and first is thrown or second throw the position.
6. wireless transceiver system as claimed in claim 5, it is characterized in that, when the power of described radiofrequency signal did not reach the saturated input power of described amplifier, described operational amplification circuit outputting drive voltage was controlled described switch and is disconnected so that described amplifier operate as normal.
7. wireless transceiver system as claimed in claim 6 is characterized in that, described operational amplification circuit is used for calculating described driving voltage according to the gain of described voltage signal and described operational amplification circuit.
8. wireless transceiver system as claimed in claim 5 is characterized in that described wireless transceiver system also comprises directional coupler, is coupled to the input of described low noise amplifier, and the described radiofrequency signal that is used to be coupled is to described power detector.
9. wireless transceiver system as claimed in claim 5 is characterized in that, described signal transmitting unit comprises:
Second filter is connected in described radio frequency integrated circuit, is used for radiofrequency signal is carried out filtering;
Power amplifier is connected in described second filter, is used for radiofrequency signal is amplified; And
The 3rd filter is connected in second of described power amplifier and described single-pole double-throw switch (SPDT) and throws between the position, is used for radiofrequency signal is carried out filtering.
10. wireless transceiver system as claimed in claim 9 is characterized in that, described first filter and described second filter are all balance filter, and described the 3rd filter is a low pass filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920301250U CN201393204Y (en) | 2009-03-13 | 2009-03-13 | Low-noise amplifier protective circuit and wireless transmit-receive system applying same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920301250U CN201393204Y (en) | 2009-03-13 | 2009-03-13 | Low-noise amplifier protective circuit and wireless transmit-receive system applying same |
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| Publication Number | Publication Date |
|---|---|
| CN201393204Y true CN201393204Y (en) | 2010-01-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920301250U Expired - Lifetime CN201393204Y (en) | 2009-03-13 | 2009-03-13 | Low-noise amplifier protective circuit and wireless transmit-receive system applying same |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105988110A (en) * | 2015-03-19 | 2016-10-05 | 飞思卡尔半导体公司 | Radar system and method with saturation detection and reset |
| CN105991147A (en) * | 2015-02-13 | 2016-10-05 | 展讯通信（上海）有限公司 | Communication receiving access and control method thereof |
| CN112180352A (en) * | 2020-08-24 | 2021-01-05 | 西安空间无线电技术研究所 | High-integration-level comprehensive radio frequency sensing array system |
| CN113315536A (en) * | 2021-05-28 | 2021-08-27 | 维沃移动通信有限公司 | Radio frequency circuit and electronic device |
| WO2023185307A1 (en) * | 2022-03-30 | 2023-10-05 | 华为技术有限公司 | Radio-frequency front-end device and signal processing method |
-
2009
- 2009-03-13 CN CN200920301250U patent/CN201393204Y/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105991147A (en) * | 2015-02-13 | 2016-10-05 | 展讯通信（上海）有限公司 | Communication receiving access and control method thereof |
| CN105988110A (en) * | 2015-03-19 | 2016-10-05 | 飞思卡尔半导体公司 | Radar system and method with saturation detection and reset |
| CN112180352A (en) * | 2020-08-24 | 2021-01-05 | 西安空间无线电技术研究所 | High-integration-level comprehensive radio frequency sensing array system |
| CN112180352B (en) * | 2020-08-24 | 2024-06-11 | 西安空间无线电技术研究所 | High-integration comprehensive radio frequency sensing array system |
| CN113315536A (en) * | 2021-05-28 | 2021-08-27 | 维沃移动通信有限公司 | Radio frequency circuit and electronic device |
| CN113315536B (en) * | 2021-05-28 | 2022-04-29 | 维沃移动通信有限公司 | Radio frequency circuit and electronic device |
| WO2023185307A1 (en) * | 2022-03-30 | 2023-10-05 | 华为技术有限公司 | Radio-frequency front-end device and signal processing method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180411 Address after: The Guangxi Zhuang Autonomous Region Nanning hi tech Zone headquarters Road No. 18, China ASEAN enterprise headquarters base three 5# workshop Patentee after: NANNING FUGUI PRECISION INDUSTRIAL CO., LTD. Address before: 518109 Guangdong city of Shenzhen province Baoan District Longhua Town Industrial Zone tabulaeformis tenth East Ring Road No. 2 two Co-patentee before: Hon Hai Precision Industry Co., Ltd. Patentee before: Hongfujin Precise Industry (Shenzhen) Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100127 |