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Power amplifier

An amplifier, amplifier stage technology, applied in the direction of amplifier, RF amplifier, amplifier type, etc., can solve the problem of shape independent of power level, etc.

Inactive Publication Date: 2011-08-03
AMPLEON NETHERLANDS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The main problem in achieving inverse Class F operation over a wide dynamic range of the input signal is maintaining the required shape of the input signal voltage / current wave independent of the power level

Method used

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Embodiment Construction

[0028] figure 1 A radio frequency (RF) power amplifier 10 in 0 RF input signals such as AM signals. The RF coupler 12 senses the input signal, feeding a signal proportional to the input signal to the envelope detector 13 . The envelope detector 13 detects the envelope of the input signal. The signal is fed to the first amplifier stage 15 through a delay line 14 . The output of the first amplifier stage 15 (shown as drain voltage) is fed to a class F interharmonic matched filter 16 and the output of the class F interharmonic matched filter 16 is fed to the second amplifier stage 17 . Each of the first and second amplifier stages is shown as a single field effect transistor, although the two amplifier stages are generally more complex than shown. The output of the second amplifier stage 15 , also shown as the drain voltage, is fed to an inverse class F output harmonically matched filter 18 . The output of the inverse class F output harmonic matched filter 18 is taken as th...

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Abstract

A radio frequency power amplifier has first and second amplifier stages coupled in series, one of which is operated in class F and the other is operated in inverse class F; an envelope detector adapted to detect an envelope of the input signal; a power supply coupled to supply an electrical supply voltage to the first and second amplifier stages, wherein the electrical supply voltage is controlled to follow the envelope of the input signal. Such amplifier makes it possible to maintain class F and inverse class F operation, respectively, of the first and second amplifier stages independent on the input signal. Preferably, this is done by controlling the electrical supply voltage so that the saturation levels of the first and second amplifier stages follow the envelope of the input signal.

Description

technical field [0001] The present invention relates to a radio frequency power amplifier using class F and inverse class F amplifier stages connected in series, operating one of the amplifier stages in class F and the other amplifier stage in inverse class F. Background technique [0002] Because of high power efficiency, RF power amplifiers are often used. Class F operation refers to operating the amplifier stage as a switching amplifier, where the amplifier stage and / or its components are driven to near saturation or saturation. This produces harmonic distortion of the carrier and subbands with information. This harmonic distortion can be removed by a filter called a harmonic trap. [0003] Class F improves efficiency and output by shaping the drain waveform using a harmonic resonator in the output network. The voltage waveform includes one or more odd harmonics and approximates a square wave, while the current includes even harmonics and approximates a half-sine wave....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/02
CPCH03F2200/504H03F3/217H03F1/0222H03F2200/102H03F2200/99H03F2200/451
Inventor 伊戈尔·布莱德诺夫拉金勒帕赛德·加亚德哈森
Owner AMPLEON NETHERLANDS