CN2922290Y - Radio-frequency device protecting circuit - Google Patents
Radio-frequency device protecting circuit Download PDFInfo
- Publication number
- CN2922290Y CN2922290Y CN 200620122253 CN200620122253U CN2922290Y CN 2922290 Y CN2922290 Y CN 2922290Y CN 200620122253 CN200620122253 CN 200620122253 CN 200620122253 U CN200620122253 U CN 200620122253U CN 2922290 Y CN2922290 Y CN 2922290Y
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- diode
- radio
- frequency devices
- protection circuit
- circuit
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Abstract
The utility model discloses a radio-frequency device protecting circuit which comprises a radio-frequency device (1), a mismatching circuit (3) that is connected with the radio-frequency device (1) in series, and a protective circuit (2) is a transient voltage restraint diode. The common end of the protective circuit is connected between the radio-frequency device (1) and the mismatching circuit (3), and the other end is earthing. The radio-frequency device protective circuit of the utility model avoids the damage of the device caused by the superposition of the reflected signal from load mismatching and the incident signal of the radio-frequency device, which improves the reliability of the radio-frequency board without sacrificing gains of the radio-frequency channel, and attenuates useful radio-frequency signals as less as possible when attenuating reflected signals.
Description
Technical field
The utility model relates to the radio circuit field, relates in particular to a kind of radio-frequency devices protection circuit.
Background technology
At present; for the guard technology of radio circuit; mainly be static discharge (Electrostatic Discharge to prevention at radio-frequency port; ESD) protect; but; in the inside of radio frequency veneer, the parasitic capacitance of protection circuit can impact radiofrequency signal, and does not have good protection circuit device to protect radio frequency veneer in the prior art.
Radio frequency veneer to a large amount of inefficacies is analyzed discovery, except static discharge can damage radio-frequency devices, the situation that also has another electric stress damage radio-frequency devices: for example, because the bad meeting of load matched causes the radiofrequency signal reflection in the radio circuit, the output signal stack of reflected signal and prime device, produce higher crest voltage, so that damage this prime device.Therefore, how to prevent that in radio frequency veneer inside too high crest voltage from damaging this radio frequency veneer and becoming the problem that the radio-frequency devices protection circuit need solve.
Fig. 1 is existing a kind of radio-frequency devices protection circuit schematic diagram.As shown in Figure 1, this circuit comprises, radio-frequency devices 1 ', circuit mismatching 3 ' and π shape resistance decrement network 2 '.Wherein, π shape resistance decrement network 2 ' is arranged between radio-frequency devices 1 ' and the circuit mismatching 3 ', is used for the reflected signal that produces because of circuit mismatching is decayed.
Concrete, the radiofrequency signal of sending when radio-frequency devices 1 ' is during through π shape resistance decrement network 2 ', π shape resistance decrement network 2 ' meeting decay part radiofrequency signal, and another part radiofrequency signal is incident to circuit mismatching 3 ', because load matched is bad (for example in the circuit mismatching 3 ', open circuit or short circuit), can cause part or all of radiofrequency signal reflection, reflected signal is attenuated during through π shape resistance decrement network 2 ', therefore, crest voltage after the output signal stack of reduction reflected signal and prime device is to reduce the damage to radio-frequency devices 1 '.
But this radio-frequency devices protection circuit has following shortcoming:
1. its protection effect and attenuation are proportional, that is, attenuation is big more, protection effect is good more, and generally to require attenuation be more than the 3dB, if attenuation during less than 3dB, the protection effect of this radio-frequency devices protection circuit is limited;
2. π shape resistance decrement network 2 ' also can be decayed to useful radiofrequency signal in the reflection attenuation signal, has sacrificed the gain of radio-frequency channel.
The utility model content
The purpose of this utility model is, a kind of radio-frequency devices protection circuit is provided.
Radio-frequency devices protection circuit of the present utility model, comprise radio-frequency devices 1, circuit mismatching 3, radio-frequency devices 1 and circuit mismatching 3 series connection, wherein, also comprise protection circuit 2, described protection circuit is that transient voltage suppresses diode, and the common port of described protection circuit is connected between described radio-frequency devices 1 and the circuit mismatching 3, its other end ground connection.
Wherein, described transient voltage inhibition diode is the bidirectional transient voltage diode.
Described bidirectional transient voltage suppresses diode, can comprise first diode, second diode, the 3rd diode and the 4th diode, wherein, the anode tap of the cathode terminal of first diode and second diode links to each other with described common port respectively, and the anode tap of the cathode terminal of the 3rd diode and the 4th diode links to each other with earth terminal respectively; The anode tap of the 3rd diode links to each other with the anode tap of first diode, and the cathode terminal of the 4th diode links to each other with the cathode terminal of second diode, makes the 3rd diode, first diode and the 4th diode, second diode form parallel connection.
Wherein, described first, second diode can be the high-speed switch diode;
Described the 3rd, the 4th diode can suppress diode for transient voltage.
Described first, second diode can be the high-speed switch diode of low junction capacitance.
Radio-frequency devices protection circuit of the present utility model can be the combination of diode and triode.
Wherein, the conducting voltage of described diode be higher than the normal radio frequency signal peak value, be lower than the damage voltage of radio-frequency devices.
The beneficial effects of the utility model are: according to radio-frequency devices protection circuit of the present utility model, by the combination etc. that transient voltage suppresses diode or other diode/triodes is set between radio-frequency devices and circuit mismatching, making the Overlay of the incoming signal of reflected signal that load mismatch produces and radio-frequency devices is that peak-to-peak value subtracts each other, radio-frequency devices can be damaged by the stack of the incoming signal of reflected signal that produces because of load mismatch and radio-frequency devices, improve the reliability of radio frequency veneer, do not sacrifice simultaneously the gain of radio-frequency channel, in the reflection attenuation signal, useful radiofrequency signal decays as far as possible less.
Description of drawings
Fig. 1 is the structural representation of the radio-frequency devices protection circuit of prior art;
Fig. 2 is the schematic diagram of prior art testing radio frequency device load mismatch circuit;
Fig. 3 is the structural representation of radio-frequency devices protection circuit of the present utility model.
Embodiment
Below, 1～3 pair of radio-frequency devices protection circuit of the present utility model is described in conjunction with the accompanying drawings.
The utility model is based on following principle and proposes, when radio circuit is analyzed, radio circuit is under the situation of load mismatch, and there is certain rules in the Overlay of the output signal of reflected signal and prime radio-frequency devices with impedance, the phasetophase of mismatch load:
Radio-frequency devices load mismatch circuit as shown in Figure 2, the output termination circuit mismatching of radio-frequency devices, microstrip line length between circuit mismatching and the radio-frequency devices is much smaller than the wavelength of test signal, this radio-frequency devices load mismatch circuit is tested, can obtain as drawing a conclusion: the open end of close Smith chart (promptly, right-hand member) test point, the crest voltage after the signal stack becomes big; (that is) test point, left end, the crest voltage after the signal stack diminishes near the short-circuit end of Smith chart.
Simultaneously, usually, in radio circuit, when open circuit, the phase invariantization of reflected signal superposes with the incoming signal peak-to-peak value; When short circuit, phase change 180 degree of reflected signal subtract each other with the incoming signal peak-to-peak value.
From the above-mentioned protection principle of time domain angle analysis; the utility model uses transient voltage to suppress (TransientVoltage Suppressor; TVS) the diode pair radio circuit is protected; when the peak value of radiofrequency signal reached the conducting voltage of transient voltage inhibition diode, transient voltage suppressed the diode current flow short circuit.
As shown in Figure 3, radio-frequency devices protection circuit of the present utility model, comprise radio-frequency devices 1, circuit mismatching 3, radio-frequency devices 1 and circuit mismatching 3 series connection, protection circuit 2 is arranged between radio-frequency devices 1 and the circuit mismatching 3, its common port is connected between radio-frequency devices 1 and the circuit mismatching 3, its other end ground connection (GND).Wherein, protection circuit 2 suppresses diode for bidirectional transient voltage, this bidirectional transient voltage suppresses diode and is made up of the first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4, the anode tap of the cathode terminal of the first diode D1 and the second diode D2 links to each other with common port respectively, and the anode tap of the cathode terminal of the 3rd diode D3 and the 4th diode D4 links to each other with earth terminal respectively; The anode tap of the 3rd diode D3 links to each other with the anode tap of the first diode D1, the cathode terminal of the 4th diode D4 links to each other with the cathode terminal of the second diode D2, the first diode D1 is connected with the 3rd diode D3, the second diode D2 connects with the 4th diode D4, makes the 3rd diode D3, the first diode D1 and the 4th diode D4, the second diode D2 form parallel connection.
In protection circuit 2, the first diode D1 and the second diode D2 are the high-speed switch diode, are used to reduce junction capacitance, prevent the 3rd diode D3 and the 4th diode D4 forward conduction; The 3rd diode D3 and the 4th diode D4 are that transient voltage suppresses diode, be used to control the conducting voltage of protection circuit, that is, the conducting voltage of protection circuit realizes by selecting the 3rd diode D3 and the 4th diode D4 with suitable puncture voltage.
Here, need the purpose of reduction junction capacitance to be: to reduce influence to the radio frequency working signal.
In addition, in radio-frequency devices protection circuit of the present utility model, the conducting voltage of the 3rd diode D3 and the 4th diode D4 will be higher than the peak value of normal radio frequency signal, less than the damage voltage of radio-frequency devices 1, just can play the effect of protection radio-frequency devices 1.
Concrete, after the reflected signal stack that output signal that radio-frequency devices 1 sends and circuit mismatching 3 return, when if this superposed signal enters protection circuit 2 with the forward peak value, this superposed signal is at first ended by the first diode D1, first diode and the 3rd diode D3 are open circuit, when the voltage of this superposed signal reaches the conducting voltage of the second diode D2, the second diode D2 is switched on, when the voltage of this superposed signal surpasses the 4th diode D4, the 4th diode D4 is breakdown, make that the second diode D2 and the 4th diode D4 are short circuit, the load impedance of radio frequency amplifier output has become short circuit (Smith chart left end) by open circuit (Smith chart right-hand member), so the Overlay of reflected signal and radio frequency amplifier output signal becomes peak-to-peak value by the peak-to-peak value addition and subtracts each other, and can not damage amplifier;
In contrast, when the peak-inverse voltage of signal surpasses the conducting voltage of the 3rd diode D3, the 3rd diode D3 punctures, the 3rd diode D3 and the first diode D1 form short circuit, the load impedance of radio frequency amplifier output has become short circuit by open circuit, the Overlay of reflected signal and radio frequency amplifier output signal becomes peak-to-peak value by the peak-to-peak value addition and subtracts each other, and can not damage amplifier.
Preferably, radio-frequency devices 1 of the present utility model is a radio frequency amplifier, and the first diode D1 and the second diode D2 are the high-speed switch diode of low junction capacitance, and the 3rd diode D3 and the 4th diode D4 are that transient voltage suppresses diode.
In addition, in order to make radio-frequency devices protection circuit of the present utility model really play the effect of protection radio-frequency devices, need control the conducting voltage that transient voltage in the protection circuit suppresses diode, the conducting voltage of promptly described transient voltage diode should be higher than the peak value of normal radio frequency signal, less than the damage voltage of radio-frequency devices.For example, certain radio frequency amplifier is under the situation of the normal coupling of output, and maximum is exported the radiofrequency signal of 20dBm, and signal peak voltage is 3.2V, is 5.2V if record the damage voltage of this radio frequency amplifier.
Therefore, preferably, the conducting voltage (Von) that transient voltage of the present utility model suppresses diode is 3.2～5.2V, and for after bound stays certain surplus, the best conducting voltage of choosing is 4～4.5V.In order to reduce the influence of junction capacitance to the radio frequency working signal, when radio frequency signal frequency was high more, the junction capacitance that needs was more little.
Be understandable that, it is that example is described that the utility model only suppresses diode with bidirectional transient voltage, but, the utility model is not limited in this, according to protection principle of the present utility model, can also adopt diode that unidirectional transient voltage suppresses diode or other types (for example, the voltage stabilizing didoes of high-speed switch diode, low parasitic capacitance etc.), diode combinations (for example, the high-speed switch diode of low parasitic capacitance and the combination of voltage stabilizing didoe, the high-speed switch diode of low parasitic capacitance is used to reduce parasitic capacitance; Voltage stabilizing didoe, be used to control conducting voltage) etc., perhaps combination of diode and triode etc., and the requirements of type selecting that be combined on the type selecting and the transient voltage of described all kinds diode or diode combinations or diode and triode suppress diode is identical substantially, at present a lot of device producers all can provide the protective device of integrated diode combinations, as the SLVU series of SEMTECH etc.,, can realize the utility model as long as satisfy requirements of type selecting to each diode.
In sum, according to radio-frequency devices protection circuit of the present utility model, by the combination etc. that transient voltage suppresses diode or other diode/triodes is set between radio-frequency devices and circuit mismatching, making the Overlay of the incoming signal of reflected signal that load mismatch produces and radio-frequency devices is that peak-to-peak value subtracts each other, therefore can not damage radio-frequency devices, improve the reliability of radio frequency veneer, do not sacrifice the gain of radio-frequency channel simultaneously.
More than describing is to make things convenient for those of ordinary skills to understand the utility model; to the detailed description that the utility model carried out; but can expect; in the scope that does not break away from claim of the present utility model and contained, can also make other variation and modification, these variations and revising all in protection range of the present utility model.
Claims (8)
1. a radio-frequency devices protection circuit comprises radio-frequency devices (1), circuit mismatching (3); Described radio-frequency devices (1) and circuit mismatching (3) series connection is characterized in that, also comprise protection circuit (2),
Described protection circuit is that transient voltage suppresses diode, and the common port of described protection circuit is connected between described radio-frequency devices (1) and the circuit mismatching (3), its other end ground connection.
2. radio-frequency devices protection circuit as claimed in claim 1 is characterized in that, it is the bidirectional transient voltage diode that described transient voltage suppresses diode.
3. radio-frequency devices protection circuit as claimed in claim 2 is characterized in that, described bidirectional transient voltage suppresses diode, comprises first diode, second diode, the 3rd diode and the 4th diode, wherein,
The anode tap of the cathode terminal of first diode and second diode links to each other with described common port respectively, and the anode tap of the cathode terminal of the 3rd diode and the 4th diode links to each other with earth terminal respectively; The anode tap of the 3rd diode links to each other with the anode tap of first diode, and the cathode terminal of the 4th diode links to each other with the cathode terminal of second diode, makes the 3rd diode, first diode and the 4th diode, second diode form parallel connection.
4. radio-frequency devices protection circuit as claimed in claim 3 is characterized in that, described first, second diode is the high-speed switch diode.
5. radio-frequency devices protection circuit as claimed in claim 3 is characterized in that, described the 3rd, the 4th diode is that transient voltage suppresses diode.
6. radio-frequency devices protection circuit as claimed in claim 4 is characterized in that, described first, second diode is the high-speed switch diode of low junction capacitance.
7. radio-frequency devices protection circuit as claimed in claim 1 is characterized in that, described protection circuit is the combination of diode and triode.
8. as each described radio-frequency devices protection circuit in the claim 3 to 7, it is characterized in that, the conducting voltage of described diode be higher than the normal radio frequency signal peak value, be lower than the damage voltage of radio-frequency devices.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620122253 CN2922290Y (en) | 2006-07-12 | 2006-07-12 | Radio-frequency device protecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620122253 CN2922290Y (en) | 2006-07-12 | 2006-07-12 | Radio-frequency device protecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2922290Y true CN2922290Y (en) | 2007-07-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620122253 Expired - Fee Related CN2922290Y (en) | 2006-07-12 | 2006-07-12 | Radio-frequency device protecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2922290Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105262546A (en) * | 2015-09-23 | 2016-01-20 | 青岛海信宽带多媒体技术有限公司 | Optical module |
| CN105652091A (en) * | 2015-12-29 | 2016-06-08 | 重庆微标科技股份有限公司 | RFID product standing-wave ratio automatic testing system |
| CN108430153A (en) * | 2018-03-09 | 2018-08-21 | 京东方科技集团股份有限公司 | A kind of data transmission link plate, display module and electronic equipment |
-
2006
- 2006-07-12 CN CN 200620122253 patent/CN2922290Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105262546A (en) * | 2015-09-23 | 2016-01-20 | 青岛海信宽带多媒体技术有限公司 | Optical module |
| CN105262546B (en) * | 2015-09-23 | 2018-08-24 | 青岛海信宽带多媒体技术有限公司 | A kind of optical module |
| CN105652091A (en) * | 2015-12-29 | 2016-06-08 | 重庆微标科技股份有限公司 | RFID product standing-wave ratio automatic testing system |
| CN105652091B (en) * | 2015-12-29 | 2018-12-04 | 重庆微标科技股份有限公司 | RFID product standing-wave ratio Auto-Test System |
| CN108430153A (en) * | 2018-03-09 | 2018-08-21 | 京东方科技集团股份有限公司 | A kind of data transmission link plate, display module and electronic equipment |
| US11357100B2 (en) | 2018-03-09 | 2022-06-07 | Beijing Boe Optoelectronics Technology Co., Ltd. | Data transmission circuit board, mobile industry processor interface and device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070711 Termination date: 20100712 |