Feed circuit of radio frequency power amplifier

Abstract

The embodiment of the invention discloses a feed circuit of a radio frequency power amplifier, which comprises a direct current power supply, a first microstrip line, a second microstrip line, a third microstrip line, a first capacitor, a second capacitor and a third capacitor, wherein the electrical length of the first microstrip line is lambda / 8 of N times, the electrical length of the third microstrip line is lambda / 4 of M times, lambda is the fundamental wave length, N is an odd number, and M is the odd number; the first end of the first microstrip line is connected with a drain or a gateof the radio frequency power amplifier, the second end of the first microstrip line is connected with the first end of the second microstrip line, and the second end of the second microstrip line is connected with the direct current power supply; the second end of the first microstrip line is connected with the first end of the third microstrip line, and the third capacitor is connected between the second of the third microstrip line and the ground; and the first capacitor and the second capacitor are connected between the second end of the second microstrip line and the ground in a parallel connection way. The embodiment of the invention is open for second harmonic, does not affect the fundamental wave matching and is conductive to realizing the matching of the second harmonic and improving the power amplification efficiency.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a radio frequency power amplifier feed circuit. Background technique [0002] In the wireless communication system, the RF power amplifier is a key component to realize the wireless transmission of RF signals. Its function is to convert the DC power provided by the DC power supply into RF power and transmit it. Power amplifier efficiency is one of the important indicators to measure the performance of RF power amplifier, which is defined as: the output power P of RF power amplifier out and the DC power supplied by the DC power supply P dc ratio. High-efficiency power amplifiers have the advantages of reducing energy consumption during operation, lowering the operating temperature of the power amplifier, improving reliability, and reducing requirements for cooling systems. [0003] There are many ways to achieve high-efficiency power amplifiers, such as ClassD, ClassE, and ...

AI Technical Summary

Problems solved by technology

[0008] However, the disadvantage of this is that the fundamental wave of the feeder appears as a reactance element and participates in the fundamental wave matching. In order to achieve the best fundamental wave matching, the reactance value often needs to be changed, and the change of this reactance value will affect the fundamental wave and the fundamental wave at the same time. Second harmonic matching brings difficulties to the design of high-efficiency power amplifiers

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