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Radio frequency linear power amplifier circuit

A technology for amplifier circuits and radio frequency power, applied in power amplifiers, amplifiers, improved amplifiers to reduce nonlinear distortion, etc., can solve problems such as power amplifier linearity degradation, improve efficiency, and shorten the time for repeatedly adjusting current limiting resistors , good linearity effect

Active Publication Date: 2020-01-10
广州穗源微电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing technologies cannot simultaneously optimize amplitude distortion (AM-AM) and phase distortion (AM-PM). When one of the optimal indicators is met, the other will inevitably deteriorate greatly
[0006] In addition, the existing ballast resistor R2 designed to enhance the thermal stability of the power amplifier tube is connected in series between the bias circuit and the base of the QRF tube. When the current passes, it will bring a certain power consumption, and the bias circuit presents The problem that the input impedance change of the power amplifier causes the linearity of the power amplifier to deteriorate

Method used

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Embodiment Construction

[0033] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.

[0034] 1. In the two-port network, S 21 Derivation of parameters

[0035] like Figure 5 As shown, the two characteristic impedances are Z 0 At the junction of the transmission line, there is a load impedance Z L , the voltage drops at the left and right ends of the transmission line are V 1 and V 2 , the corresponding port currents are I 1 and I 2 ; The incident voltage wave for forward transmission is set to V i + (i=1,2), the corresponding current is The reflected voltage wave is set to V i -(i=1,2), the corresponding current is From the above, we can list the equation relationship (Note: Admittance Y L =1 / Z L ):

[0036]

[0037] I 1 +I 2 =Y L V 2

[0038] first order to find S 11 , then the above formula can be changed to:

[0039]

[0040]

[0041] Organized: ...

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Abstract

The invention provides a radio frequency linear power amplifier circuit which comprises a radio frequency drive tube (Q1) and a radio frequency power amplifier tube (Q2). The base electrode of the radio frequency drive tube (Q1) is connected with the input end (RF IN) of the amplifier circuit, the collector electrode of the radio frequency drive tube (Q1) is connected with the base electrode of the radio frequency power amplifier tube (Q2), and the collector electrode of the radio frequency power amplifier tube (Q2) is connected with the output end (RF out) of the amplifier circuit; a pre-distortion circuit and a bias circuit (1) are connected in parallel between the base electrode of the radio frequency drive tube (Q1) and the input end (IN) of the amplifier circuit, and a ballast resistor (R10) is connected in series between the base electrode of the radio frequency drive tube (Q1) and the input end (IN) of the amplifier circuit, and the ballast resistor (R10) is connected in parallel with a capacitor (C10); a bias circuit (2) is connected in parallel between the base electrode of the radio frequency power amplifier tube (Q2) and the radio frequency drive tube (Q1), and a ballastresistor (R20) is connected in series between the base electrode of the radio frequency power amplifier tube (Q2) and the radio frequency drive tube (Q1), and the ballast resistor (R20) is connectedin parallel with a capacitor (C20); the radio frequency linear power amplifier not only can improve the design efficiency of the power amplifier, but also can realize good linearity.

Description

technical field [0001] The invention relates to the technical field of radio frequency power amplifiers, in particular to a radio frequency linear power amplifier circuit. Background technique [0002] RF power amplifier is a key component of wireless transmitters, and its application frequency range covers a very wide range, from hundreds of MHz in civil mobile communication to hundreds of GHz in electronic warfare, radar and other military fields. The basic working principle of the RF power amplifier is to amplify the modulated frequency band signal to the required power value, and send it to the antenna for transmission, so as to ensure that the receiver in a certain area can receive a satisfactory signal level. [0003] Since the function of the RF power amplifier is to output sufficient signal power to the load, it needs to consume a large amount of power supply energy. The ratio of the AC power obtained on the load to the DC power provided by the power supply is called...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/32H03F3/24
CPCH03F1/3282H03F3/245
Inventor 刘祖华彭林章国豪
Owner 广州穗源微电子科技有限公司
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