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Biasing circuit of power amplifier

A power amplifier and circuit technology, applied in the direction of improving amplifiers to reduce temperature/power supply voltage changes, etc., can solve problems such as low bias current of Q4 and cannot be turned on normally

Inactive Publication Date: 2014-03-26
许文
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

but, figure 1 The circuit can only work properly in a small temperature range
Under extreme temperature conditions, sometimes the bias current of Q4 is too low and cannot be turned on normally

Method used

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Embodiment Construction

[0012] In order to solve the above technical problems, the present invention mainly relates to a constant voltage source circuit using a three-input operational amplifier for minimum output current protection.

[0013] When PM2, PM11 and RFI in the dotted box are omitted, figure 2 The circuit shown is a typical LDO regulated power supply. The bias current source and PM0, PM1, NM0, NM1, NM10, NM11, PM10 and PM11 form a typical two-stage operational amplifier. The PM12 driven by its output end generates VREF to supply power to the external circuit, and the resistor divider m*RFV and RFV generate a feedback voltage VFV and input signal V1 to jointly drive the input end of the operational amplifier. When the loop gain is high, the error between VFV and V1 is very small, and the output voltage Vref = (m+1)V1 is a constant voltage that does not change with temperature, such as image 3 As shown in A.

[0014] Since the turn-on voltage of the HBT decreases with the rise of the te...

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PUM

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Abstract

The invention relates to the technical field of power amplifiers, in particular to a temperature compensation circuit, playing a role in stabilizing gains, of a power amplifier. By means of the temperature compensation circuit of the power amplifier, on the basis that high linearity and high efficiency are achieved, the power amplifier has good temperature characteristic indexes within the whole temperature changing range.

Description

technical field [0001] The invention relates to the technical field of power amplifiers, in particular to a power amplifier temperature compensation circuit with a stable gain function. Background technique [0002] As a key component of transmitters in various wireless communication systems, power amplifiers have strict requirements for various indicators in various communication standards. With the increase of data transmission volume, the current 3G / 4G standards put forward more requirements Strict requirements, on the basis of high linearity and high efficiency, also require the power amplifier to have good temperature characteristic indicators in the entire temperature range. [0003] Gallium arsenide heterojunction device (GaAs HBT) is a radio frequency device with high linearity and high efficiency performance, which is widely used in the design of linear power amplifiers in mobile communication systems, but currently GaAs HBT devices are used to design The performan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/30
Inventor 许文吕全立
Owner 许文