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Integrated circuit with parallel sets of transistor amplifiers having different turn on power levels

A power amplifier and amplifier technology, which can be applied to amplifiers with distributed constants in the coupling network, amplifiers with semiconductor devices/discharge tubes, amplifiers, etc., and can solve the problems of limiting the net bandwidth of the amplifier, efficiency gain flatness, insufficient power range, etc.

Active Publication Date: 2014-12-10
CREE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] While the use of separate carrier and peaking amplifiers in a Doherty amplifier can provide increased efficiency, it may have insufficient power range for some applications
In addition, circuit components including splitters, quarter-wave transformers, and combiners may limit the amplifier's net bandwidth, efficiency, and / or gain flatness over a desired range of power levels and / or operating frequencies

Method used

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  • Integrated circuit with parallel sets of transistor amplifiers having different turn on power levels
  • Integrated circuit with parallel sets of transistor amplifiers having different turn on power levels
  • Integrated circuit with parallel sets of transistor amplifiers having different turn on power levels

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Embodiment Construction

[0029] Embodiments of the invention are described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the size and relative sizes of regions may be exaggerated for clarity. Like reference numerals refer to like elements throughout.

[0030] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. It should also be understood that when used in this specif...

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Abstract

A power amplifier circuit includes a power splitter that splits an input signal into a plurality of component input signals. At least two sets of transistor amplifiers are each coupled in parallel to the power splitter to receive and amplify different ones of the component input signals to generate amplified component output signals. The two transistor amplifiers of each set of transistor amplifiers are configured to turn on at different power levels of the input signal relative to each other. A combiner is configured to receive and combine the amplified component output signals from the at least two sets of transistor amplifiers into an output signal. An integrated circuit package encloses the power splitter, the at least two sets of transistor amplifiers, and the combiner.

Description

technical field [0001] The present invention relates generally to electronic circuits and, more particularly, to RF power amplifier circuits. Background technique [0002] Power amplifiers, such as those used in base stations of cellular communication systems, often operate at output power levels that are much lower than peak power. Unfortunately backing off the power level reduces the efficiency of the power amplifier in the transmitter. In conventional amplifiers, there is a direct relationship between efficiency and input drive level. Therefore, high efficiency (DC to RF conversion efficiency) is often not achieved until the RF input power level becomes high enough to drive the amplifier into compression or saturation. In multi-carrier communication systems where it is desired that amplifiers remain as linear as possible, this region of high efficiency cannot be used. [0003] A power amplifier circuit design that provides improved efficiency at back-off power levels i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/02H03F3/195H03F3/60H01L23/66H01P5/12
CPCH03F2200/423H01L2223/6644H01L2924/1903H03F2200/15H03F2200/255H03F2200/387H01L2223/6655H03F2200/543H03F1/0288H03F1/0266H03F2200/451H03F3/604H01L2924/0002H01L2223/6627H03F3/195H01L2924/00
Inventor R·S·彭格利
Owner CREE INC