A protection circuit and protection method for a power amplifier
A power amplifier and protection circuit technology, which is applied in the field of power amplifier protection, can solve problems such as power amplifier burnout, power amplifier bias establishment process uncertainty, etc.
Active Publication Date: 2022-02-15
GUANGZHOU HUIZHI MICROELECTRONICS
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Problems solved by technology
[0002] In the related art, the overcurrent protection circuit and the overvoltage protection circuit of the power amplifier reduce the gain of the power amplifier or turn off the power amplifier by reducing or shutting off the bias current of the power amplifier after the protection is activated; In the case of canceling, the process of establishing the bias of the power amplifier is uncertain, and the input has a large input power signal. At the moment when the path is restored and established, the power amplifier will be burned out due to the large input power.
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[0036] The present application will be described in further detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments provided here are only used to explain the present application, and are not intended to limit the present application. In addition, the embodiments provided below are some embodiments for implementing the application, rather than providing all the embodiments for implementing the application. In the case of no conflict, the technical solutions described in the embodiments of the application can be combined in any manner implement.
[0037] It should be noted that, in the embodiments of the present application, the terms "comprising", "comprising" or any other variant thereof are intended to cover non-exclusive inclusion, so that a method or device comprising a series of elements not only includes the explicitly stated elements, but also include other elements not explicitly listed, or also include ...
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The embodiment of the present application proposes a protection circuit and a protection method of a power amplifier. The protection circuit of the power amplifier includes: a detection circuit, a controller, and an input impedance adjustment circuit; the input end of the detection circuit is connected to the power tube of the power amplifier; the detection circuit The output terminal is connected to the input terminal of the controller; the detection circuit is used to detect the working electrical signal of the power amplifier, and generates a triggering electrical signal based on the working electrical signal; the controller is used to generate the first control signal and the second based on the triggering electrical signal. Control signal; the first control signal is used to control the bias current of the power tube of the power amplifier to reduce or restore the gain of the power amplifier; the second control signal is used to adjust the characteristic parameters of the input impedance adjustment circuit; the input impedance adjustment circuit uses The input power of the power amplifier is decreased or increased in response to the second control signal.
Description
technical field [0001] The present application relates to power amplifier protection technology, in particular to a power amplifier protection circuit and protection method. Background technique [0002] In the related art, the overcurrent protection circuit and the overvoltage protection circuit of the power amplifier reduce the gain of the power amplifier or turn off the power amplifier by reducing or shutting off the bias current of the power amplifier after the protection is activated; In the case of release, the process of establishing the bias of the power amplifier is uncertain. When a large input power signal enters the input, the power amplifier will be burned out due to the large input power at the moment when the path is restored and established. Contents of the invention [0003] Embodiments of the present application are expected to provide a protection circuit and a protection method for a power amplifier. [0004] In the first aspect, the embodiment of the ...
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IPC IPC(8): H03F1/52
CPCH03F1/52H03F1/56H03F3/245H03F2200/471H03F2200/462
Inventor 彭洋洋侯阳
Owner GUANGZHOU HUIZHI MICROELECTRONICS