CN2777901Y - Electrostatic protection circuit for RF circuit - Google Patents
Electrostatic protection circuit for RF circuit Download PDFInfo
- Publication number
- CN2777901Y CN2777901Y CN 200520053840 CN200520053840U CN2777901Y CN 2777901 Y CN2777901 Y CN 2777901Y CN 200520053840 CN200520053840 CN 200520053840 CN 200520053840 U CN200520053840 U CN 200520053840U CN 2777901 Y CN2777901 Y CN 2777901Y
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- electric capacity
- clamper
- circuit
- protection circuit
- electrostatic discharge
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Abstract
The utility model relates to an electrostatic protection circuit, particularly an electrostatic protection circuit for radio frequency circuits using diode clamps. The electrostatic protection circuit for radio frequency circuits comprises a clamper connected with a protected radio frequency circuit in parallel, a first virtual ground capacitor and a second virtual ground capacitor. The clamper comprises a positive clamper and a negative clamper, wherein the positive clamper is in contact with the ground through the first virtual ground capacitor and the negative clamper is in contact with the ground through the second virtual ground capacitor. The electrostatic protection circuit for radio frequency circuits adopts the clamper to be connected with the virtual ground capacitors, which is equivalent to the increase of the on-state voltage of a clamping diode, so that the electrostatic protection of radio frequency circuits can be realized under conditions of large power classes, and simultaneously, the characteristics of 1dB compression points, blockage, etc. of radio frequency circuits can not be reduced yet. The circuit is simple, positive and negative bias voltages don't need to provide additionally, so that the cost is also lowered.
Description
Technical field
The utility model relates to electrostatic discharge protective circuit, is specifically related to a kind of radio circuit electrostatic discharge protective circuit.
Background technology
Radio circuit comprises radio frequency microstrip line, radio frequency PCB and radio-frequency devices etc., the electrostatic defending grade of these circuit is all very low, protect bad, be easy to damage, electrostatic damage can cause the decreased performance of circuit, even forfeiture, for improving the reliability of radio frequency products, need take the electrostatic defending measure, particularly input/output port and electrostatic sensitivity device etc. be increased the electrostatic defending network.But owing to radio circuit frequency height, wavelength weak point, cause the electrostatic designs of radio circuit challenging, require not influence the performance of radio circuit on the one hand, as standing wave, stability, 1dB compression point, obstruction etc., on the other hand because electrostatic discharge protection circuit is an accessory circuit, should be too not complicated, should be simple more good more.A kind of circuit of using morely at present is the clamper protecting network, reduces transient energy (Transient Voltage Suppression is abbreviated as TVS) by the high speed clamper, thereby reaches the function of electrostatic protection.
In the technical scheme of the prior art shown in Fig. 1 one, on the circuit between radio circuit port and the internal radio frequency, be parallel with positive and negative two high speed clampers, be shorted to ground by the high speed clamper.During operate as normal, because the amplitude of radiofrequency signal is very low, diode is in open-circuit condition; When static discharge,, static short to ground, has been protected the device of back level because the high pressure of static makes the rapid conducting of diode.This circuit is simpler, need not to increase too many adjunct circuit, as long as increase double diode, but because the conducting voltage of diode is lower, when the power of radiofrequency signal was big, as big block signal, high peak signal etc., diode just may conducting, thereby reduce the energy of radiofrequency signal, influence the performances such as 1dB compression point, obstruction of radio circuit.This scheme can only be used in the radio frequency low-power circuit.
In the technical scheme of the prior art shown in Fig. 2 two, a high speed clamper is received positive supply, another high speed clamper is received negative supply, and when operate as normal, two diodes are in open-circuit condition; When static discharge, because the high pressure of static makes the rapid conducting of one of them diode, to power supply, power end is ac short circuit over the ground with static short, is equivalent to electrostatic leakage has been arrived on the ground, has protected the device of back level like this.This circuit is equivalent to the conducting voltage of diode has been raised; 1dB compression point and occlusive effects to radio circuit reduced like this; do not influence the performance of radiofrequency signal; but this circuit needs positive-negative power; for the radio circuit that does not have negative supply usually; this protective circuit need increase extra negative supply, thereby has increased the complexity and the cost of circuit.
The utility model content
The technical problems to be solved in the utility model is, at the above-mentioned defective of prior art, provides a kind of electrostatic discharge protection circuit of radio circuit, when reaching the antistatic purpose, neither influences the performance of radio circuit, can also simplified design, reduce cost.
The technical scheme that its technical problem that solves the utility model adopts is: construct a kind of radio circuit electrostatic discharge protection circuit; comprise the clamper that is connected in parallel on the protected radio circuit; the first virtual earth electric capacity and the second virtual earth electric capacity; described clamper comprises positive clamper and negative clamping device; described positive clamper is by the first virtual earth capacity earth, and described negative clamping device is by the second virtual earth capacity earth.
The above-mentioned first virtual earth electric capacity is single electric capacity, and the second virtual earth electric capacity also is single electric capacity.Perhaps the first virtual earth electric capacity is for comprising two or more shunt capacitances, and the second virtual earth electric capacity is the electric capacity that comprises two or more parallel connections.Can also for, the first virtual earth electric capacity comprises the shunt capacitance more than three, the second virtual earth electric capacity comprises the electric capacity of the parallel connection more than three.
Above-mentioned positive clamper and negative clamping device are connected in parallel between described radio circuit port and the ground, can also be connected in parallel between the periphery and ground of electrostatic sensitive radio-frequency devices.
Above-mentioned electric capacity is ceramic condenser, and the withstand voltage scope of electric capacity is 16V～50V, and the appearance value is 100pF, 0.022uF or 0.47uF, 1uF.
Above-mentioned clamper is that transient voltage suppresses diode or high speed double diode, high speed diode, high speed triode.
Because radio circuit electrostatic discharge protection circuit of the present utility model adopts clamper to link to each other with virtual earth electric capacity, be equivalent to raise the conducting voltage of clamping diode, therefore can under more high-power grade condition, realize the electrostatic defending of radio circuit, also can not reduce the characteristics such as 1dB compression point, obstruction of radio circuit simultaneously; Because circuit is simple, do not need to add positive negative bias voltage in addition simultaneously, make cost lower yet.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the circuit diagram of the radio circuit electrostatic discharge protection circuit of one of prior art;
Fig. 2 is the circuit diagram of two radio circuit electrostatic discharge protection circuit of prior art;
Fig. 3 is the circuit diagram of the radio circuit electrostatic discharge protection circuit of a kind of preferred embodiment of the present utility model.
Embodiment
Below in conjunction with accompanying drawing radio circuit electrostatic discharge protection circuit of the present utility model is further described.
As shown in Figure 3, electrostatic discharge protection circuit figure for a kind of preferred embodiment of the present utility model, in the present embodiment, on the circuit between prevention at radio-frequency port and the internal radio frequency circuit, be parallel with positive clamper and negative clamping device, positive clamper is by two capacity earths that are connected in parallel, and the negative clamping device is also by two capacity earths that are connected in parallel, and promptly clamper is connected to virtual earth (virtual earth also can be described as floating ground, be the not direct ground connection of clamper, but by being connected to ground behind the electric capacity).
When operate as normal, because the input radio frequency signal is given the charging of virtual earth electric capacity by the leakage current of clamper, therefore can fill certain electric charge with on the electric capacity, certain voltage is arranged over the ground, make diode current flow, radio-frequency power need be raised certain voltage, with regard to being equivalent to the conducting voltage of diode has been raised, 1dB compression point and occlusive effects to radio circuit reduced like this, do not influence the performance of radiofrequency signal; When static discharge, because the high pressure of static makes the rapid conducting of one of them diode, electrostatic energy is absorbed by electric capacity, because electric capacity has bigger internal resistance, final electrostatic energy has been released on the ground by the electric capacity internal resistance, has protected radio circuit like this.
Normal conditions, the ground connection shunt capacitance that positive clamper is connected with the negative clamping device are symmetry normally, and promptly just the number of the ground connection shunt capacitance that is connected with the negative clamping device of clamper is identical with capacity.
The utility model can also have other execution modes, and positive clamper is by a capacity earth, and the negative clamping device is also by a capacity earth.The cost of this mode is relatively low, but effect is not passed through the effective of two shunt capacitances.
The utility model can also have other execution modes, and positive clamper is by the capacity earth that is connected in parallel more than three or three, and the negative clamping device is also by three or three capacity earths that are connected in parallel.The effect of this mode is also relatively good, and cost is higher relatively.
Adopt clamper virtual earth mode antistatic of the present utility model, its antistatic effect depends on the size of virtual earth electric capacity, and virtual earth electric capacity can be selected withstand voltage suitable different several big or small electric capacity parallel connections according to the difference of rf frequency.For radio-frequency power-10dBm～+ 20dBm between the time, specifically can adopt withstand voltage scope is 16V～50V, the appearance value is the electric capacity of 100pF, 0.022uF, 0.47uF or 1uF.Rf frequency is low, selects bigger electric capacity for use, and the rf frequency height is selected less electric capacity for use.
The clamper that uses in the radio circuit electrostatic discharge protection circuit of the present utility model requires response speed fast, clamper can be managed (Transient Voltage Suppression, Chinese are that transient voltage suppresses), high speed double diode and other high speed diodes and triode etc. for TVS.
Claims (10)
1, a kind of radio circuit electrostatic discharge protection circuit; comprise the clamper that is connected in parallel on the protected radio circuit; described clamper comprises positive clamper and negative clamping device; it is characterized in that; described electrostatic discharge protection circuit (1) also comprises the first virtual earth electric capacity and the second virtual earth electric capacity; described positive clamper is by the first virtual earth capacity earth, and described negative clamping device is by the second virtual earth capacity earth.
2, radio circuit electrostatic discharge protection circuit according to claim 1 is characterized in that, the described first virtual earth electric capacity is single electric capacity, and the described second virtual earth electric capacity is single electric capacity.
3, radio circuit electrostatic discharge protection circuit according to claim 1 is characterized in that, the described first virtual earth electric capacity comprises the electric capacity of two parallel connections, and the described second virtual earth electric capacity comprises the electric capacity of two parallel connections.
4, radio circuit electrostatic discharge protection circuit according to claim 1 is characterized in that, the described first virtual earth electric capacity comprises the shunt capacitance more than three, and the described second virtual earth electric capacity comprises the electric capacity of the parallel connection more than three.
5, radio circuit electrostatic discharge protection circuit according to claim 1 is characterized in that, described positive clamper and negative clamping device are connected in parallel between the periphery and ground of described radio circuit port or electrostatic sensitive radio-frequency devices.
6, according to any one described radio circuit electrostatic discharge protection circuit among the claim 1-5, it is characterized in that described electric capacity is ceramic condenser.
7, radio circuit electrostatic discharge protection circuit according to claim 6 is characterized in that, the withstand voltage scope of described electric capacity is 16V～50V, and the appearance value is 100pF, 0.022uF or 0.47uF, 1uF.
According to any one described radio circuit electrostatic discharge protection circuit among the claim 1-5, it is characterized in that 8, described clamper is that transient voltage suppresses diode.
9, according to any one described radio circuit electrostatic discharge protection circuit among the claim 1-5, it is characterized in that described clamper is the high speed double diode.
According to any one described radio circuit electrostatic discharge protection circuit among the claim 1-5, it is characterized in that 10, described clamper is high speed diode or high speed triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520053840 CN2777901Y (en) | 2005-01-11 | 2005-01-11 | Electrostatic protection circuit for RF circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520053840 CN2777901Y (en) | 2005-01-11 | 2005-01-11 | Electrostatic protection circuit for RF circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2777901Y true CN2777901Y (en) | 2006-05-03 |
Family
ID=36745275
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520053840 Expired - Lifetime CN2777901Y (en) | 2005-01-11 | 2005-01-11 | Electrostatic protection circuit for RF circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2777901Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101374027B (en) * | 2008-10-22 | 2011-07-27 | 武汉虹信通信技术有限责任公司 | Automatic test system and method for 1dB compressing point of high-power radio frequency power-amplifying module |
| CN102456671A (en) * | 2010-10-25 | 2012-05-16 | 上海华虹Nec电子有限公司 | Shielding ring structure for radio frequency system on chip |
| CN104332468A (en) * | 2014-10-08 | 2015-02-04 | 中国电子科技集团公司第四十一研究所 | Electrostatic protection circuit used for radio frequency circuit |
| CN105188243A (en) * | 2014-02-14 | 2015-12-23 | 普罗艾尔机械制造有限公司 | Vacuum Cleaner And Device For Discharging Static Charge, Particularly For Use In Vacuum Cleaners |
-
2005
- 2005-01-11 CN CN 200520053840 patent/CN2777901Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101374027B (en) * | 2008-10-22 | 2011-07-27 | 武汉虹信通信技术有限责任公司 | Automatic test system and method for 1dB compressing point of high-power radio frequency power-amplifying module |
| CN102456671A (en) * | 2010-10-25 | 2012-05-16 | 上海华虹Nec电子有限公司 | Shielding ring structure for radio frequency system on chip |
| CN105188243A (en) * | 2014-02-14 | 2015-12-23 | 普罗艾尔机械制造有限公司 | Vacuum Cleaner And Device For Discharging Static Charge, Particularly For Use In Vacuum Cleaners |
| CN104332468A (en) * | 2014-10-08 | 2015-02-04 | 中国电子科技集团公司第四十一研究所 | Electrostatic protection circuit used for radio frequency circuit |
| CN104332468B (en) * | 2014-10-08 | 2017-01-25 | 中国电子科技集团公司第四十一研究所 | Electrostatic protection circuit used for radio frequency circuit |
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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 | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20150111 Granted publication date: 20060503 |