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Radio-frequency power amplifier with fast envelope tracking

A technology of radio frequency power and envelope tracking, which is applied in the application field of space communication and/or mobile phone network, and can solve the problem of reducing the switching unit

Active Publication Date: 2012-04-04
EUROPEAN SPACE AGENCY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, despite effectively and densely embedding the two transistors used as the RF amplifier and switch of the DC-DC converter in a single package, the cables connecting the transistors to the converter's diodes, capacitors and inductors introduce High parasitic capacitance and inductance reduce the performance of switching cells

Method used

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  • Radio-frequency power amplifier with fast envelope tracking
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  • Radio-frequency power amplifier with fast envelope tracking

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Embodiment Construction

[0035] already described figure 1 A conceptual solution of an RF power amplifier with envelope tracking according to both the prior art and the present invention is shown.

[0036] figure 2 A conceptual scheme of an RF power amplifier with envelope tracking according to the present invention is shown. The tracking path includes a low-pass filter LPF to reduce the bandwidth of the envelope signal E(t) (refer to Figure 8A and 8B This is described in detail) and a pulse width modulator drive circuit PWD for generating a pulse width modulated signal PWM(t) proportional to the filter envelope E(t). Said pulse width modulated signal PWM(t) drives a DC / DC converter DCC, which is of switching type without any linear stages. It should be noted that the low pass filter and delay line are optional components; these components are not required for the application.

[0037] image 3 A circuit diagram of an RF power amplifier section with envelope tracking according to a first embod...

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Abstract

A radio-frequency power amplifier with envelope tracking, comprising: a power RF amplifying device for amplifying a RF signal; and a switching DC / DC converter, comprising a switching device and a rectifying device, for providing said power RF amplifying device with a DC power supply at a. voltage level proportional to an envelope of said RF signal; wherein said switching device is a RF power transistor; characterized in that said rectifying device, and preferably also said power RF amplifying device, is also a transistor of a same technology, connected as a two-terminal device. Preferably, said power RF amplifying device is also a transistor of said same technology. A low-pass filter can also be provided for reducing the bandwidth of the envelope signal on which the PWM signal driving the DC / DC converter depends.

Description

technical field [0001] The present invention relates to a radio frequency power amplifier with envelope tracking, especially to the application in space communication and / or mobile phone network. Background technique [0002] Due to the very stringent requirements of 3G-UMTS, improving the efficiency, consumption, loss and / or linearity of radio frequency (RF) solid-state power amplifiers is a high priority for terrestrial mobile phone network infrastructure manufacturers. The extremely high linearity required significantly affects the efficiency of power amplifiers used in base stations. Similar requirements arise in space applications. [0003] However, it is well known that linearity and energy efficiency are opposite requirements. [0004] The "flexible amplifier" concept involves tuning the power supply to the average RF power for high linearity and high efficiency. "Envelope Tracking" is an evolution of this method, where the power supply is adjusted in a dynamic man...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/20H03F3/189
CPCH03F3/245H03F2200/504H03F1/0227H03F2200/102H03F3/195H03F1/0222
Inventor N·里加卢C·德勒波D·萨尔丹M·坎波韦基奥
Owner EUROPEAN SPACE AGENCY
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