CN210380778U - Broadband overdrive power amplifier protection circuit - Google Patents
Broadband overdrive power amplifier protection circuit Download PDFInfo
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- CN210380778U CN210380778U CN201921513276.4U CN201921513276U CN210380778U CN 210380778 U CN210380778 U CN 210380778U CN 201921513276 U CN201921513276 U CN 201921513276U CN 210380778 U CN210380778 U CN 210380778U
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- power amplifier
- input end
- circuit
- radio frequency
- feedback circuit
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Abstract
The utility model discloses a broadband overdrive power amplifier protection circuit, which comprises a radio frequency input, a sampling feedback circuit, a first power amplifier, a switch comparison circuit, a second power amplifier and a radio frequency output; the radio frequency input is connected with the input end of the first power amplifier; the input end of the sampling feedback circuit is connected with the input end of the first power amplifier, and the output end of the sampling feedback circuit is connected with the input end of the switch comparison circuit; the output end of the first power amplifier is connected with the input end of the switch comparison circuit; the input end of the second power amplifier is connected with the output end of the switch comparison circuit; the output end of the second power amplifier is connected with the radio frequency output. The utility model has the characteristics of work bandwidth is wide, the loss is little, the isolation is high, the reliability is high, simple structure easily realizes, product upgrading convenience etc.
Description
Technical Field
The utility model relates to a broadband overdrive power amplifier protection circuit belongs to power amplifier system protection technical field.
Background
With the deep development of 4G mobile communication and the coming of the age of 5G mobile communication, a Power Amplifier is a radio frequency front end device in a wireless communication system, and it has become a trend for a mobile terminal to implement multi-mode operation by using the same Power Amplifier (PA). The different operating modes require different gains of the power amplifier, so that the input of the power amplifier needs to be adjusted correspondingly while the operating mode of the mobile terminal is switched. In the actual production process, it is found that the rear stage of the power amplifier is often damaged due to the fact that the radio frequency input is too large, so how to effectively control the amplitude of the input signal is a key related to whether the power amplifier operates reliably, and therefore, a broadband overdrive power amplifier protection circuit is needed to be designed.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: problem and not enough to prior art existence, the utility model provides a simple structure, easily upgrading a broadband overdrive power amplifier protection circuit.
The technical scheme is as follows: a broadband overdrive power amplifier protection circuit comprises a radio frequency input, a sampling feedback circuit, a first power amplifier, a switch comparison circuit, a second power amplifier and a radio frequency output; the radio frequency input is connected with the input end of the first power amplifier; the input end of the sampling feedback circuit is connected with the input end of the first power amplifier, and the output end of the sampling feedback circuit is connected with the input end of the switch comparison circuit; the output end of the first power amplifier is connected with the input end of the switch comparison circuit; the input end of the second power amplifier is connected with the output end of the switch comparison circuit; the output end of the second power amplifier is connected with the radio frequency output.
The switch comparison circuit judges and processes the signal of the sampling feedback circuit through the RFSA2033, so as to realize the protection of the radio frequency power amplifier. The switch comparison circuit is controlled by using an integrated chip RFSA2033, and compared with the traditional scheme, the scheme has the characteristics of convenience in product upgrade and high reliability.
As a further improvement of the utility model; the sampling feedback circuit uses an integrated chip AD8318 with a negative slope for sampling, and compared with the traditional sampling, the scheme omits a subtracter algorithm part, improves the performance and increases the isolation.
As a further improvement of the utility model; the input end of the sampling feedback circuit is connected with the input end of the first power amplifier through the sampling resistor, and compared with the traditional method of sampling by using a coupler, the sampling feedback circuit saves cost and reduces volume.
Has the advantages that: compared with the prior art, the utility model provides a broadband overdrive power amplifier protection circuit has that the working bandwidth is wide, the loss is little, the isolation is high, the reliability is high, simple structure easily realizes, characteristics such as product upgrading convenience.
Drawings
FIG. 1 is an integrated circuit diagram of a sampling feedback circuit and a switch comparison circuit;
fig. 2 is a circuit block diagram of an embodiment of the present invention.
Detailed Description
The present invention will be further clarified by the following detailed description, which is to be understood as being given by way of illustration only, and not by way of limitation, after reading the present invention, and modifications of various equivalent forms of the present invention which fall within the limits of the appended claims.
As shown in fig. 2, the broadband overdrive power amplifier protection circuit includes a radio frequency input, a sampling feedback circuit, a power amplifier 1, a switch comparison circuit, a power amplifier 2 and a radio frequency output, wherein the radio frequency input is connected with an input end of the power amplifier 1, an input end of the sampling feedback circuit is connected with an input end of the power amplifier 1, and an output end of the sampling feedback circuit is connected with an input end of the switch comparison circuit; the output end of the power amplifier 1 is connected with the input end of the switch comparison circuit; the input end of the power amplifier 2 is connected with the output end of the switch comparison circuit; the output end of the power amplifier 2 is connected with the radio frequency output.
The switch comparison circuit judges and processes the signal of the sampling feedback circuit through the RFSA2033 to realize the protection of the radio frequency power amplifier. Wherein, the sampling feedback circuit is connected with the radio frequency input through a sampling resistor R1. The switch comparison circuit is independently operated by an integrated module RFSA2033, and if the input is too large, the attenuation value of the RFSA2033 is larger, so that the power amplifier is protected.
The input end of the sampling feedback circuit is connected with the input end of the power amplifier 1 through a sampling resistor R1.
The sampling feedback circuit is connected with matching capacitors C1, C2 and C3 and resistors R2, R3 and R4 through an integrated module AD 8318.
As shown in FIG. 1, the sampling feedback circuit is formed by connecting a resistor R1 with pin 2 of an AD8313, connecting an input voltage 5V with pin 1 of the AD8313 through a resistor R2 and two capacitors C1 and C2 to ground, and outputting the output voltage after connecting a resistor R3 and a resistor R4 to ground and a capacitor C3 in series with pin 7 and pin 8 of the AD 8313.
Claims (4)
1. The utility model provides a broadband overdrive power amplifier protection circuit which characterized in that: the sampling feedback circuit comprises a radio frequency input, a sampling feedback circuit, a first power amplifier, a switch comparison circuit, a second power amplifier and a radio frequency output; the radio frequency input is connected with the input end of the first power amplifier; the input end of the sampling feedback circuit is connected with the input end of the first power amplifier, and the output end of the sampling feedback circuit is connected with the input end of the switch comparison circuit; the output end of the first power amplifier is connected with the input end of the switch comparison circuit; the input end of the second power amplifier is connected with the output end of the switch comparison circuit; the output end of the second power amplifier is connected with the radio frequency output.
2. The broadband overdrive power amplifier protection circuit of claim 1, wherein: the switch comparison circuit judges and processes the signal of the sampling feedback circuit through RFSA 2033.
3. The broadband overdrive power amplifier protection circuit of claim 1, wherein: the sampling feedback circuit uses an integrated chip AD8318 with a negative slope for sampling.
4. The broadband overdrive power amplifier protection circuit of claim 1, wherein: the input end of the sampling feedback circuit is connected with the input end of the first power amplifier through a sampling resistor; the sampling feedback circuit is connected with the radio frequency input through a sampling resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921513276.4U CN210380778U (en) | 2019-09-11 | 2019-09-11 | Broadband overdrive power amplifier protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921513276.4U CN210380778U (en) | 2019-09-11 | 2019-09-11 | Broadband overdrive power amplifier protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210380778U true CN210380778U (en) | 2020-04-21 |
Family
ID=70254746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921513276.4U Active CN210380778U (en) | 2019-09-11 | 2019-09-11 | Broadband overdrive power amplifier protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210380778U (en) |
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2019
- 2019-09-11 CN CN201921513276.4U patent/CN210380778U/en active Active
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