Radio frequency linear power amplifier circuit

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...

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

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