Power amplifier external interface circuit

A technology of external interface and circuit, applied in the direction of logic circuit connection/interface layout, etc., can solve the problem of low reliability

Inactive Publication Date: 2014-04-02
COMBA TELECOM SYST CHINA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on this, it is necessary to provide a power amplifier external interface circuit that can effectively prevent external interference and have high reliability in order to solve the problem that the external interface of the power amplifier is easily subject to external interference in the power amplifier circuit and cause low reliability.

Method used

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  • Power amplifier external interface circuit
  • Power amplifier external interface circuit

Examples

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Embodiment Construction

[0012] Such as figure 1 As shown, a power amplifier external interface circuit includes a triode Q2, a resistor R1, a resistor R2, a resistor R3 and a resistor R4;

[0013] One end of the resistor R1 is connected to the base of the transistor Q2, the other end of the resistor R1 is connected to one end of the resistor R3, and one end of the resistor R2 is connected to the base of the transistor Q2. One end of the resistor R1 is connected, the other end of the resistor R2 is connected to the emitter of the transistor Q2, one end of the resistor R4 is connected to the collector of the transistor Q2, and the other end of the resistor R4 is connected to the actual An input port requiring a power supply voltage, the other end of the resistor R3 is connected to a predetermined rated power supply voltage port, and the connection point of the resistor R1 and the resistor R3 is connected to an input signal port.

[0014] In this embodiment, the series voltage division of R1 and R2 is ...

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PUM

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Abstract

The invention discloses a power amplifier external interface circuit. A triode Q2, a resistor R1, a resistor R2, a resistor R3 and a resistor R4 are connected, and an internal circuit and an external output port of the power amplifier external interface circuit are effectively isolated by using the breakover characteristic of the triode, so that the interface internal circuit is well protected, reverse threshold voltage is improved through the triode and an input divider resistor, the security of the power amplifier external interface circuit can be effectively protected, external disturbance is effectively prevented, the reliability of the power amplifier external interface circuit can be improved, and circuit security is ensured.

Description

technical field [0001] The invention relates to the technical field of interface circuits, in particular to an external interface circuit of a power amplifier. Background technique [0002] In mobile communication power amplifier products, the power amplifier has a variety of external interface circuits, including enabling circuits, alarm indicator circuits, alarm output circuits, address input control circuits, and presence detection circuits. In the production debugging and engineering application of power amplifiers, its ports are easily affected by static electricity, unsatisfactory levels and various external interferences. This puts higher requirements on the reliability of the power amplifier port. [0003] There are two types of input circuits currently used in power amplifiers: a single CMOS (Complementary Metal Oxide Semiconductor, Complementary Metal Oxide Semiconductor) tube or a single BJT (Bipolar Junction Transistor, bipolar transistor) tube. Due to the inhe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K19/0175
Inventor 张世杰李合理黄健安查文清
Owner COMBA TELECOM SYST CHINA LTD
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