Protection circuit of power amplifier

A power amplifier and protection circuit technology, which is applied to the layout of amplifier protection circuits, power amplifiers, etc., to achieve the effect of harmonic suppression

Inactive Publication Date: 2008-08-06
UNIBAND ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem of complex circuit manufacturing cost, an embodiment of the present invention provides a protection circuit for a power amplifier

Method used

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  • Protection circuit of power amplifier
  • Protection circuit of power amplifier
  • Protection circuit of power amplifier

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Embodiment Construction

[0020] Fig. 1 illustrates the protective circuit of a power amplifier according to an embodiment of the present invention, and protective circuit 10 is connected with a power amplifier 20 and an antenna terminal element 30, and protective circuit 10 comprises an inductance 11, and its one end is connected with power amplifier 20, and the other end Connected to the antenna end element 30; a capacitor 15, one end of which is connected to the inductor 11 and the power amplifier 20, and the other end is connected to the ground wire; a capacitor 13, one end of which is connected to the inductor 11 and the antenna end element 30, and the other end is connected to the ground wire; And a resistor 17, one end of which is connected to the inductance 11 and the antenna end element 30 and is located between the capacitor 13 and the antenna end element 30; wherein the capacitor 13 and the capacitor 15 have the same capacitance characteristic, but the present invention is not limited to this ...

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PUM

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Abstract

The invention provides a protection circuit of a power amplifier, which is connected to the power amplifier and an antenna terminal element; the protection circuit comprises an inductor, a first capacitor, a second capacitor and a resistor, wherein, one end of the inductor is connected with the power amplifier; the other end of the inductor is connected to the antenna terminal element; one end of the first capacitor is connected to the inductor and the power amplifier; the other end of the first capacitor is grounded; one end of the second capacitor is connected to the inductor and the antenna terminal element; the other end of the second capacitor is grounded; one end of the resistor is connected to the inductor and the antenna terminal element and positioned between the second capacitor and the antenna terminal element. Through the invention, the provided protection circuit of the power amplifier has the function of restraining harmonic wave and protects the power amplifier when the antenna falls off or opens circuit.

Description

technical field [0001] The present invention relates to a protection circuit, in particular to a protection circuit capable of protecting a power amplifier in a wireless communication circuit. Background technique [0002] The rapid development of global wireless communication technology is the focus of industrial development in the 21st century. From 2G / 2.5G wireless communication technology to 3G and 3G Beyond network system technology, wireless data communication and wireless network technology are changing with each passing day, so that various electronic consumer products are equipped with Wireless communication devices satisfy people's desire to connect with the world. Therefore, it becomes very important for a radio frequency (RF) antenna capable of transmitting and receiving radio waves. [0003] Generally, an antenna switch and a low-pass filter are provided between the power amplifier and the RF front end to suppress harmonics and form a buffer The device protect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/52H03F3/20
Inventor 杨伯堂
Owner UNIBAND ELECTRONICS CORP
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