CN219643883U - Protection device of power amplification cascade circuit - Google Patents
Protection device of power amplification cascade circuit Download PDFInfo
- Publication number
- CN219643883U CN219643883U CN202320761554.8U CN202320761554U CN219643883U CN 219643883 U CN219643883 U CN 219643883U CN 202320761554 U CN202320761554 U CN 202320761554U CN 219643883 U CN219643883 U CN 219643883U
- Authority
- CN
- China
- Prior art keywords
- input end
- resistor
- output end
- operational amplifier
- protection device
- 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.)
- Active
Links
- 230000003321 amplification Effects 0.000 title claims abstract description 23
- 238000003199 nucleic acid amplification method Methods 0.000 title claims abstract description 23
- 238000001514 detection method Methods 0.000 claims abstract description 18
- 239000003990 capacitor Substances 0.000 claims description 18
- 238000010586 diagram Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 102100039435 C-X-C motif chemokine 17 Human genes 0.000 description 3
- 101000889048 Homo sapiens C-X-C motif chemokine 17 Proteins 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Amplifiers (AREA)
Abstract
The utility model relates to the technical field of radio frequency power amplification, in particular to a protection device of a power amplification cascade circuit, wherein the power amplification cascade circuit comprises a first-stage amplifier and a second-stage amplifier, and the protection device comprises: the detection circuit comprises a first input end, a first output end and a second output end; the control circuit comprises a first grid voltage control circuit and a second grid voltage control circuit, the first grid voltage control circuit comprises a first operational amplifier chip, the first operational amplifier chip comprises a first in-phase input end and a third output end, the second grid voltage control circuit comprises a second operational amplifier chip, the second operational amplifier chip comprises a second in-phase input end and a fourth output end, the first in-phase input end is connected with the first output end, the third output end is connected with the first stage amplifier, the second in-phase input end is connected with the second output end, the fourth output end is connected with the second stage amplifier, and the slew rate of the first operational amplifier chip is smaller than that of the second operational amplifier chip, so that the safety of the power amplifying cascade circuit is improved.
Description
Technical Field
The utility model relates to the technical field of radio frequency power amplification, in particular to a protection device of a power amplification cascade circuit.
Background
In the power amplification cascade circuit, damage of the power amplification tube occurs at a time, so that a certain program protection measure is necessary for the power amplification tube, and when a signal passing through the front-stage power amplification tube is amplified to generate larger energy in the circuit, if the rear-stage power amplification tube does not start to work at the moment, the risk that the rear-stage power amplification tube is broken down by a high-power signal can be caused, so that the damage is caused.
The prior art has the operation of controlling a circuit through software, but has higher complexity and great operation difficulty.
Therefore, how to protect the post-stage power amplifier tube is a technical problem to be solved at present.
Disclosure of Invention
In view of the above, the present utility model provides a protection device for a power amplifying cascode circuit that overcomes or at least partially solves the above-mentioned problems.
The utility model provides a protection device of a power amplification cascade circuit, which comprises a first-stage amplifier and a second-stage amplifier, wherein the energy generated by a signal of the first-stage amplifier is larger than a preset value, and the protection device comprises the following components:
the detection circuit comprises a first input end, a first output end and a second output end;
the control circuit comprises a first grid voltage control circuit and a second grid voltage control circuit, the first grid voltage control circuit comprises a first operational amplifier chip, the first operational amplifier chip comprises a first in-phase input end and a third output end, the second grid voltage control circuit comprises a second operational amplifier chip, and the second operational amplifier chip comprises a second in-phase input end and a fourth output end;
the first in-phase input end is connected with the first output end, the third output end is connected with the first-stage amplifier, the second in-phase input end is connected with the second output end, the fourth output end is connected with the second-stage amplifier, and the slew rate of the first operational amplifier chip is smaller than that of the second operational amplifier chip.
Further, the detection circuit includes a detection diode.
Further, the detection diode is of the model SMS7630-079 LF.
Further, the first operational amplifier chip further includes: the first inverting input end is connected with the first voltage threshold adjusting group;
the second operational amplifier chip further includes: the second inverting input terminal is connected with the second voltage threshold adjusting group.
Further, the first voltage threshold adjustment group includes: the first voltage input end, the first resistor, the second resistor and the first capacitor;
the first voltage input end is sequentially connected with the first resistor, the second resistor and the grounding end, a first connection point is formed between the first resistor and the second resistor, one end of the first capacitor is connected with the first voltage input end, the other end of the first capacitor is connected with the grounding end, and the first connection point is connected with the first inverting input end;
the second voltage threshold adjustment group includes: the second voltage input end, the third resistor, the fourth resistor and the second capacitor;
the second voltage input end is connected with the third resistor, the fourth resistor and the grounding end in sequence, a second connection point is formed between the third resistor and the fourth resistor, one end of the second capacitor is connected with the second voltage input end, the other end of the second capacitor is connected with the grounding end, and the second connection point is connected with the second inverting input end.
Further, the first operational amplifier chip adopts an OPA347 model.
Further, the second operational amplifier chip adopts OPA356 model.
One or more technical solutions in the embodiments of the present utility model at least have the following technical effects or advantages:
the utility model provides a protection device of a power amplification cascade circuit, wherein the power amplification cascade circuit comprises a first-stage amplifier and a second-stage amplifier, and the energy generated by a signal of the first-stage amplifier is larger than a preset value, and the protection device comprises: the detection circuit comprises a first input end, a first output end and a second output end; the control circuit comprises a first grid voltage control circuit and a second grid voltage control circuit, the first grid voltage control circuit comprises a first operational amplifier chip, the first operational amplifier chip comprises a first in-phase input end and a third output end, the second grid voltage control circuit comprises a second operational amplifier chip, the second operational amplifier chip comprises a second in-phase input end and a fourth output end, wherein the first in-phase input end is connected with the first output end, the third output end is connected with the first stage amplifier, the second in-phase input end is connected with the second output end, the fourth output end is connected with the second stage amplifier, the slew rate of the first operational amplifier chip is smaller than that of the second operational amplifier chip, and therefore the turn-on rate of the second stage amplifier connected with the fourth output end of the second operational amplifier chip is larger than that of the first stage amplifier connected with the third output end of the first operational amplifier chip, when a high-power signal reaches the second stage amplifier, the second stage amplifier is in a state of being in which the second stage amplifier has been in an on state, the risk of the power amplifier is effectively prevented from being turned on by the cascade connection.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. Also throughout the drawings, like reference numerals are used to designate like parts. In the drawings:
FIG. 1 shows a schematic diagram of a power amplification cascade circuit in an embodiment of the utility model;
fig. 2 is a schematic diagram of a protection device of a power amplifying cascade circuit according to an embodiment of the present utility model;
FIG. 3 is a schematic diagram of a detection circuit in an embodiment of the utility model;
FIG. 4 is a schematic diagram of a first voltage threshold adjustment group of a first operational amplifier chip according to an embodiment of the present utility model;
fig. 5 is a schematic diagram of a second voltage threshold adjustment group of a second op-amp chip according to an embodiment of the present utility model.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present utility model, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance.
The embodiment of the utility model provides a protection device for a power amplification cascade circuit, wherein the power amplification cascade circuit comprises a first-stage amplifier 101 and a second-stage amplifier 102, as shown in fig. 1, and the energy generated by a signal of the first-stage amplifier is larger than a preset value. Of course, the power amplifying cascade circuit further comprises other amplifiers, and the protection device of the present utility model is only used between two stages of amplifiers with energy generated by signals greater than a preset value, and only one set of cascades is used as an example for description below.
As shown in fig. 2, 4 and 5, the protection device includes: the detection circuit 201 includes a first input terminal 2011, a first output terminal, and a second output terminal. Wherein, the output signal of the first output end is consistent with that of the second output end.
A control circuit 202, the control circuit 202 comprising: a first gate voltage control circuit 2021 and a second gate voltage control circuit 2022; the first gate voltage control circuit 2021 includes a first op-amp chip U4, the first op-amp chip U4 includes a first in-phase input terminal V1 and a third output terminal VGS1, the second gate voltage control circuit 2022 includes a second op-amp chip U5, and the second op-amp chip U5 includes a second in-phase input terminal V2 and a fourth output terminal VGS2.
One end of each of the first and second gate voltage control circuits 2021 and 2022 is connected to the detection circuit 201, and the other end is connected to the first and second stage amplifiers 101 and 102, respectively.
Specifically, the first in-phase input terminal V1 is connected to the first output terminal, the third output terminal VGS1 is connected to the first stage amplifier 101, the second in-phase input terminal V2 is connected to the second output terminal, and the fourth output terminal VGS2 is connected to the second stage amplifier 102. The slew rate of the first operational amplifier chip U4 is smaller than that of the second operational amplifier chip U5.
The slew rate is an average value of the time change rate of the output voltage of the closed-loop amplifier when the input is a step signal, and the larger the slew rate is, the faster the corresponding response speed is. It can be seen that the rate of transfer from the second op amp chip V5 to the second stage amplifier 102 is faster. And further, the turn-on rates of the two amplifiers can be controlled by selecting the operational amplifier chip.
The detection circuit 201 comprises a detection diode U3 with a detection function, specifically adopting the model SMS7630-079LF, and the schematic diagram of the detection circuit 201 is shown in fig. 3, and the main function is to detect an input signal, output a detection V, and divide the input signal into two paths, namely a first output end and a second output end, for inputting two gate voltage control circuits.
The first op-amp chip U4 further includes: the first inverting input terminal IN1-, the first inverting input terminal IN 1-is connected with the first voltage threshold adjustment group; the second op-amp chip U5 further includes: the second inverting input terminal IN2-, the second inverting input terminal IN 2-is connected to the second voltage threshold adjustment group.
As shown in fig. 4, the first voltage threshold adjustment group includes: the first voltage input terminal VCC1, the first resistor R2, the second resistor R5 and the first capacitor C17;
the first voltage input end VCC1 is sequentially connected with the first resistor R2, the second resistor R5 and the grounding end GND, a first connection point P1 is formed between the first resistor R2 and the second resistor R5, one end of the first capacitor C17 is connected with the first voltage input end VCC1, the other end of the first capacitor C17 is connected with the grounding end GND, and the first connection point P1 is connected with the first inverting input end IN1-.
As shown in fig. 5, the second voltage threshold adjustment group includes: the second voltage input end VCC2, the third resistor R3, the fourth resistor R5 and the second capacitor C18;
the second voltage input end VCC2 is connected with the third resistor R3, the fourth resistor R6 and the grounding end GND IN sequence, a second connection point P2 is formed between the third resistor R3 and the fourth resistor R6, one end of the second capacitor R18 is connected with the second voltage input end VCC2, the other end of the second capacitor R18 is connected with the grounding end GND, and the second connection point P2 is connected with the second inverting input end IN2-.
The first resistor R2, the second resistor R5, the third resistor R3 and the fourth resistor R6 can be used for voltage division and adjustment of the threshold voltage of the gate voltage output.
In an alternative embodiment, the first op-amp chip U4 is model OPA 347. The second operational amplifier chip adopts OPA356 model.
One or more technical solutions in the embodiments of the present utility model at least have the following technical effects or advantages:
the utility model provides a protection device of a power amplification cascade circuit, wherein the power amplification cascade circuit comprises a first-stage amplifier and a second-stage amplifier, and the energy generated by a signal of the first-stage amplifier is larger than a preset value, and the protection device comprises: the detection circuit comprises a first input end, a first output end and a second output end; the control circuit comprises a first grid voltage control circuit and a second grid voltage control circuit, the first grid voltage control circuit comprises a first operational amplifier chip, the first operational amplifier chip comprises a first in-phase input end and a third output end, the second grid voltage control circuit comprises a second operational amplifier chip, the second operational amplifier chip comprises a second in-phase input end and a fourth output end, wherein the first in-phase input end is connected with the first output end, the third output end is connected with the first stage amplifier, the second in-phase input end is connected with the second output end, the fourth output end is connected with the second stage amplifier, the slew rate of the first operational amplifier chip is smaller than that of the second operational amplifier chip, and therefore the turn-on rate of the second stage amplifier connected with the fourth output end of the second operational amplifier chip is larger than that of the first stage amplifier connected with the third output end of the first operational amplifier chip, when a high-power signal reaches the second stage amplifier, the second stage amplifier is in a state of being in which the second stage amplifier has been in an on state, the risk of the power amplifier is effectively prevented from being turned on by the cascade connection.
While preferred embodiments of the present utility model have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the utility model.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present utility model without departing from the spirit or scope of the utility model. Thus, it is intended that the present utility model also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (7)
1. A protection device for a power amplification cascade circuit, the power amplification cascade circuit including a first stage amplifier and a second stage amplifier, the power generated by a signal from the first stage amplifier being greater than a predetermined value, the protection device comprising:
the detection circuit comprises a first input end, a first output end and a second output end;
the control circuit comprises a first grid voltage control circuit and a second grid voltage control circuit, the first grid voltage control circuit comprises a first operational amplifier chip, the first operational amplifier chip comprises a first in-phase input end and a third output end, the second grid voltage control circuit comprises a second operational amplifier chip, and the second operational amplifier chip comprises a second in-phase input end and a fourth output end;
the first in-phase input end is connected with the first output end, the third output end is connected with the first-stage amplifier, the second in-phase input end is connected with the second output end, the fourth output end is connected with the second-stage amplifier, and the slew rate of the first operational amplifier chip is smaller than that of the second operational amplifier chip.
2. The protection device of claim 1, wherein the detection circuit comprises a detection diode.
3. The protection device of claim 2, wherein the detector diode is of the SMS7630-079LF type.
4. The protection device of claim 1, wherein the first op-amp chip further comprises: the first inverting input end is connected with the first voltage threshold adjusting group;
the second operational amplifier chip further includes: the second inverting input terminal is connected with the second voltage threshold adjusting group.
5. The protection device of claim 4, wherein the first voltage threshold adjustment group comprises: the first voltage input end, the first resistor, the second resistor and the first capacitor;
the first voltage input end is sequentially connected with the first resistor, the second resistor and the grounding end, a first connection point is formed between the first resistor and the second resistor, one end of the first capacitor is connected with the first voltage input end, the other end of the first capacitor is connected with the grounding end, and the first connection point is connected with the first inverting input end;
the second voltage threshold adjustment group includes: the second voltage input end, the third resistor, the fourth resistor and the second capacitor;
the second voltage input end is connected with the third resistor, the fourth resistor and the grounding end in sequence, a second connection point is formed between the third resistor and the fourth resistor, one end of the second capacitor is connected with the second voltage input end, the other end of the second capacitor is connected with the grounding end, and the second connection point is connected with the second inverting input end.
6. The protection device of claim 1, wherein the first op-amp chip is OPA 347.
7. The protection device of claim 1, wherein the second op-amp chip is OPA 356.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320761554.8U CN219643883U (en) | 2023-04-07 | 2023-04-07 | Protection device of power amplification cascade circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320761554.8U CN219643883U (en) | 2023-04-07 | 2023-04-07 | Protection device of power amplification cascade circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219643883U true CN219643883U (en) | 2023-09-05 |
Family
ID=87817190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320761554.8U Active CN219643883U (en) | 2023-04-07 | 2023-04-07 | Protection device of power amplification cascade circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219643883U (en) |
-
2023
- 2023-04-07 CN CN202320761554.8U patent/CN219643883U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| TW503345B (en) | Power controller | |
| CN102075148B (en) | Over-temperature protection circuit for radio frequency power amplifier | |
| WO2002019519A1 (en) | Power amplifier module | |
| JP2008005160A (en) | Cascode-connected amplifier circuit, semiconductor integrated circuit using the same, and receiving device | |
| US9705452B2 (en) | Protection circuit for power amplifier | |
| CN101375499A (en) | Current mirror circuit | |
| CN111162510A (en) | Load driving circuit with quick protection function and protection method thereof | |
| CN110212507B (en) | Surge protection circuit | |
| CN219643883U (en) | Protection device of power amplification cascade circuit | |
| KR102000759B1 (en) | Adaptive bias circuit and power amplifier | |
| CN114070212A (en) | Radio frequency front-end module with current protection function and corresponding electronic equipment | |
| US8018280B2 (en) | Thermal regulation of a class-D audio amplifier | |
| CN207442795U (en) | Suitable for low noise, the high bandwidth trans-impedance amplifier of wide dynamic range | |
| US3462697A (en) | Stabilized amplifier having improved overload recovery | |
| CN113331493A (en) | Short-circuit protection circuit and electron cigarette | |
| EP1872979A2 (en) | Amplifier and control method thereof | |
| CN105897177A (en) | Amplifier Circuit Applied To Display Apparatus | |
| KR100379590B1 (en) | Arrangement for protecting the output transistors in a power amplifier | |
| US10622956B2 (en) | Signal level detection and overrange signal limiter and clamp for electronic circuits | |
| CN109375687B (en) | Anti-irradiation bipolar temperature monitoring circuit | |
| KR100775942B1 (en) | Amplifier having class-d chain structure | |
| CN203590236U (en) | Automatic optical power control device | |
| CN110932678A (en) | Adjustable microwave power amplifier | |
| GB1033704A (en) | Improvements in or relating to transistor amplifiers | |
| CN219611336U (en) | Current protection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |